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Ziopharm Oncology Inc – ‘10-Q/A’ for 6/30/12 – ‘EX-101.LAB’

On:  Tuesday, 8/28/12, at 4:07pm ET   ·   For:  6/30/12   ·   Accession #:  1144204-12-48414   ·   File #:  1-33038

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 8/28/12  Ziopharm Oncology Inc             10-Q/A      6/30/12   50:3.1M                                   Toppan Merrill/FA

Amendment to Quarterly Report   —   Form 10-Q   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q/A      Amendment to Quarterly Report                       HTML     29K 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     20K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     20K 
 4: EX-32.1     Certification -- §906 - SOA'02                      HTML     18K 
32: R1          Document and Entity Information                     HTML     37K 
23: R2          Balance Sheets                                      HTML    112K 
30: R3          Balance Sheets (Parenthetical)                      HTML     39K 
34: R4          Statements Of Operations                            HTML     67K 
46: R5          Statement Of Stockholders' Equity                   HTML     66K 
24: R6          Statement Of Stockholders' Equity (Parenthetical)   HTML     18K 
29: R7          Statements of Cash Flows                            HTML    142K 
21: R8          Business                                            HTML     26K 
15: R9          Summary of Significant Accounting Policies          HTML     19K 
47: R10         Collaborations and Alliances                        HTML     21K 
36: R11         Fair Value Measurements                             HTML     38K 
35: R12         Net Loss per Share                                  HTML     23K 
40: R13         Related Party Transactions                          HTML     22K 
41: R14         Commitments and Contingencies                       HTML     53K 
39: R15         Warrants                                            HTML     52K 
42: R16         Common Stock                                        HTML     19K 
31: R17         Stock-Based Compensation                            HTML     48K 
33: R18         Fair Value Measurements (Tables)                    HTML     27K 
38: R19         Net Loss per Share (Tables)                         HTML     22K 
50: R20         Warrants (Tables)                                   HTML     42K 
44: R21         Stock-Based Compensation (Tables)                   HTML     52K 
26: R22         Business - Additional Information (Detail)          HTML     23K 
37: R23         Collaborations and Alliances - Additional           HTML     24K 
                Information (Detail)                                             
28: R24         Assets and Liabilities Measured at Fair Value on    HTML     26K 
                Recurring Basis (Detail)                                         
13: R25         Potential Dilutive Shares Excluded from             HTML     26K 
                Computation of Diluted Net Loss Per Share (Detail)               
45: R26         Related Party Transactions - Additional             HTML     28K 
                Information (Detail)                                             
48: R27         Commitments and Contingencies - Additional          HTML    121K 
                Information (Detail)                                             
18: R28         Number of Warrants Outstanding (Detail)             HTML     21K 
17: R29         Warrants - Additional Information (Detail)          HTML     74K 
19: R30         Assumptions Used In Binomial Valuation Model and    HTML     25K 
                Black-Scholes Valuation Model (Detail)                           
20: R31         Warrant Exercise (Detail)                           HTML     32K 
22: R32         Common Stock - Additional Information (Detail)      HTML     34K 
11: R33         Stock-Based Compensation Expense on All Employee    HTML     23K 
                and Non-Employee Awards (Detail)                                 
43: R34         Stock-Based Compensation - Additional Information   HTML     31K 
                (Detail)                                                         
25: R35         Fair Value of Stock Options Assumptions Using       HTML     34K 
                Black-Scholes Option Valuation Model (Detail)                    
27: R36         Stock Option Activity Under Stock Option Plan       HTML     83K 
                (Detail)                                                         
14: R37         Summary of Unvested Restricted Stock (Detail)       HTML     46K 
49: XML         IDEA XML File -- Filing Summary                      XML     74K 
16: EXCEL       IDEA Workbook of Financial Reports (.xls)            XLS    392K 
 5: EX-101.INS  XBRL Instance -- ziop-20120630                       XML    731K 
 7: EX-101.CAL  XBRL Calculations -- ziop-20120630_cal               XML    109K 
 8: EX-101.DEF  XBRL Definitions -- ziop-20120630_def                XML    650K 
 9: EX-101.LAB  XBRL Labels -- ziop-20120630_lab                     XML    966K 
10: EX-101.PRE  XBRL Presentations -- ziop-20120630_pre              XML    726K 
 6: EX-101.SCH  XBRL Schema -- ziop-20120630                         XSD    147K 
12: ZIP         XBRL Zipped Folder -- 0001144204-12-048414-xbrl      Zip    101K

‘EX-101.LAB’   —   XBRL Labels — ziop-20120630_lab

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xml:lang="en-US" id="id_123082_506122_1_1"> Accounts Payable Current </label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="us-gaap_AccruedLiabilitiesCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xml:lang="en-US" id="id_123082_511240_1_1"> Accrued Liabilities Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xml:lang="en-US" id="id_123082_511240_2_1"> Accrued expenses </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedDeficitDuringDevelopmentStageMember" xlink:label="us-gaap_AccumulatedDeficitDuringDevelopmentStageMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedDeficitDuringDevelopmentStageMember_lbl" xml:lang="en-US" id="id_123082_500343_1_1"> Accumulated Deficit During Development Stage [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AccumulatedDeficitDuringDevelopmentStageMember_lbl" xml:lang="en-US" id="id_123082_500343_2_1"> Accumulated Deficit during Development Stage </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedDeficitDuringDevelopmentStageMember" xlink:to="us-gaap_AccumulatedDeficitDuringDevelopmentStageMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xml:lang="en-US" id="id_123082_499638_1_1"> Additional Paid In Capital Common Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xml:lang="en-US" id="id_123082_499638_2_1"> Additional paid-in capital - common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapitalCommonStock" xlink:to="us-gaap_AdditionalPaidInCapitalCommonStock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_AdditionalPaidInCapitalCommonStockMember" xlink:label="ziop_AdditionalPaidInCapitalCommonStockMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_AdditionalPaidInCapitalCommonStockMember_lbl" xml:lang="en-US" id="id_123082_530731_3_1"> Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_AdditionalPaidInCapitalCommonStockMember_lbl" xml:lang="en-US" id="id_123082_530731_1_1"> Additional Paid In Capital Common Stock [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_AdditionalPaidInCapitalCommonStockMember_lbl" xml:lang="en-US" id="id_123082_530731_2_1"> Additional Paid in Capital, Common Stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_AdditionalPaidInCapitalCommonStockMember" xlink:to="ziop_AdditionalPaidInCapitalCommonStockMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xml:lang="en-US" id="id_123082_500272_1_1"> Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xml:lang="en-US" id="id_123082_500272_2_1"> Stock-based compensation </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_lbl" xml:lang="en-US" id="id_123082_512252_1_1"> Adjustments To Additional Paid In Capital Stock Issued Issuance Costs </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_lbl" xml:lang="en-US" id="id_123082_512252_2_1"> Issuance of common stock, commissions and expenses </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_AdjustmentsToAdditionalPaidInCapitalWarrantExpired" xlink:label="ziop_AdjustmentsToAdditionalPaidInCapitalWarrantExpired"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_AdjustmentsToAdditionalPaidInCapitalWarrantExpired_lbl" xml:lang="en-US" id="id_123082_524673_3_1"> Adjustments to Additional Paid in Capital, Warrant Expired </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_AdjustmentsToAdditionalPaidInCapitalWarrantExpired_lbl" xml:lang="en-US" id="id_123082_524673_1_1"> Adjustments To Additional Paid In Capital Warrant Expired </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="ziop_AdjustmentsToAdditionalPaidInCapitalWarrantExpired_lbl" xml:lang="en-US" id="id_123082_524673_8_1"> Expired warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_AdjustmentsToAdditionalPaidInCapitalWarrantExpired" xlink:to="ziop_AdjustmentsToAdditionalPaidInCapitalWarrantExpired_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_502541_1_1"> Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_502541_2_1"> Adjustments to reconcile net loss to net cash used in operating activities: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US" id="id_123082_497723_1_1"> Amendment Flag </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US" id="id_123082_497723_2_1"> Amendment Flag </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xml:lang="en-US" id="id_123082_512699_1_1"> Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xml:lang="en-US" id="id_123082_512699_2_1"> Antidilutive securities excluded from computation of earnings per share, amount </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xml:lang="en-US" id="id_123082_500817_1_1"> Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xml:lang="en-US" id="id_123082_500817_2_1"> Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_AssetAcquiredOtherThanThroughBusinessCombinationCashPaid" xlink:label="ziop_AssetAcquiredOtherThanThroughBusinessCombinationCashPaid"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_AssetAcquiredOtherThanThroughBusinessCombinationCashPaid_lbl" xml:lang="en-US" id="id_123082_525843_3_1"> Asset Acquired Other than Through Business Combination, Cash Paid </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_AssetAcquiredOtherThanThroughBusinessCombinationCashPaid_lbl" xml:lang="en-US" id="id_123082_525843_1_1"> Asset Acquired Other Than Through Business Combination Cash Paid </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_AssetAcquiredOtherThanThroughBusinessCombinationCashPaid_lbl" xml:lang="en-US" id="id_123082_525843_2_1"> Asset Purchase Agreement, additional cash payment for inventory </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_AssetAcquiredOtherThanThroughBusinessCombinationCashPaid" xlink:to="ziop_AssetAcquiredOtherThanThroughBusinessCombinationCashPaid_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US" id="id_123082_507639_1_1"> Assets </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US" id="id_123082_507639_6_1"> Total assets </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US" id="id_123082_498468_1_1"> Assets [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US" id="id_123082_498468_2_1"> ASSETS </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="us-gaap_AssetsCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US" id="id_123082_513098_1_1"> Assets Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US" id="id_123082_513098_6_1"> Total current assets </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="us-gaap_AssetsCurrentAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xml:lang="en-US" id="id_123082_513511_1_1"> Assets Current [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xml:lang="en-US" id="id_123082_513511_2_1"> Current assets: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AssetsCurrentAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsMember" xlink:label="us-gaap_AssetsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsMember_lbl" xml:lang="en-US" id="id_123082_505333_1_1"> Assets [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AssetsMember_lbl" xml:lang="en-US" id="id_123082_505333_2_1"> Assets </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsMember" xlink:to="us-gaap_AssetsMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US" id="id_123082_508454_1_1"> Award Type [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US" id="id_123082_508454_2_1"> Award Type [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_AwardTypeAxis_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_BaxterHealthcareCorporationMember" xlink:label="ziop_BaxterHealthcareCorporationMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_BaxterHealthcareCorporationMember_lbl" xml:lang="en-US" id="id_123082_603797_3_1"> Baxter Healthcare Corporation </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_BaxterHealthcareCorporationMember_lbl" xml:lang="en-US" id="id_123082_603797_1_1"> Baxter Healthcare Corporation [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_BaxterHealthcareCorporationMember_lbl" xml:lang="en-US" id="id_123082_603797_2_1"> Baxter Healthcare Corporation </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_BaxterHealthcareCorporationMember" xlink:to="ziop_BaxterHealthcareCorporationMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_BeginningOfPeriodMember" xlink:label="ziop_BeginningOfPeriodMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_BeginningOfPeriodMember_lbl" xml:lang="en-US" id="id_123082_531071_3_1"> Beginning of Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_BeginningOfPeriodMember_lbl" xml:lang="en-US" id="id_123082_531071_1_1"> Beginning Of Period [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_BeginningOfPeriodMember_lbl" xml:lang="en-US" id="id_123082_531071_2_1"> Beginning of Period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_BeginningOfPeriodMember" xlink:to="ziop_BeginningOfPeriodMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_BlackScholesOptionPricingModelMember" xlink:label="ziop_BlackScholesOptionPricingModelMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_BlackScholesOptionPricingModelMember_lbl" xml:lang="en-US" id="id_123082_559133_3_1"> Black Scholes Option Pricing Model </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_BlackScholesOptionPricingModelMember_lbl" xml:lang="en-US" id="id_123082_559133_1_1"> Black Scholes Option Pricing Model [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_BlackScholesOptionPricingModelMember_lbl" xml:lang="en-US" id="id_123082_559133_2_1"> Black Scholes Option Pricing Model </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_BlackScholesOptionPricingModelMember" xlink:to="ziop_BlackScholesOptionPricingModelMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xml:lang="en-US" id="id_123082_507311_1_1"> Business Description And Basis Of Presentation [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xml:lang="en-US" id="id_123082_507311_2_1"> Business </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:to="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US" id="id_123082_510062_1_1"> Cash And Cash Equivalents At Carrying Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US" id="id_123082_510062_4_1"> Cash and cash equivalents, end of period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US" id="id_123082_510062_5_1"> Cash and cash equivalents, beginning of period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US" id="id_123082_510062_2_1"> Cash and cash equivalents </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure_lbl" xml:lang="en-US" id="id_123082_507532_1_1"> Cash And Cash Equivalents Fair Value Disclosure </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure_lbl" xml:lang="en-US" id="id_123082_507532_2_1"> Cash equivalents </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:to="us-gaap_CashAndCashEquivalentsFairValueDisclosure_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_lbl" xml:lang="en-US" id="id_123082_505888_1_1"> Cash And Cash Equivalents Period Increase Decrease </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_lbl" xml:lang="en-US" id="id_123082_505888_6_1"> Net increase (decrease) in cash and cash equivalents </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xml:lang="en-US" id="id_123082_504485_1_1"> Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xml:lang="en-US" id="id_123082_504485_2_1"> Supplementary disclosure of noncash investing and financing activities: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:to="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="us-gaap_ClassOfStockLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xml:lang="en-US" id="id_123082_507793_1_1"> Class Of Stock [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xml:lang="en-US" id="id_123082_507793_2_1"> Class of Stock [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfStockLineItems" xlink:to="us-gaap_ClassOfStockLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="us-gaap_ClassOfWarrantOrRightAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightAxis_lbl" xml:lang="en-US" id="id_123082_509379_1_1"> Class Of Warrant Or Right [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightAxis_lbl" xml:lang="en-US" id="id_123082_509379_2_1"> Class of Warrant or Right [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightAxis" xlink:to="us-gaap_ClassOfWarrantOrRightAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="us-gaap_ClassOfWarrantOrRightDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightDomain_lbl" xml:lang="en-US" id="id_123082_506760_1_1"> Class Of Warrant Or Right [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightDomain_lbl" xml:lang="en-US" id="id_123082_506760_2_1"> Class of Warrant or Right [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightDomain" xlink:to="us-gaap_ClassOfWarrantOrRightDomain_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightExercisedInPeriod" xlink:label="ziop_ClassOfWarrantOrRightExercisedInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightExercisedInPeriod_lbl" xml:lang="en-US" id="id_123082_528967_3_1"> Class of Warrant or Right, Exercised in Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightExercisedInPeriod_lbl" xml:lang="en-US" id="id_123082_528967_1_1"> Class Of Warrant Or Right Exercised In Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightExercisedInPeriod_lbl" xml:lang="en-US" id="id_123082_528967_2_1"> Warrant exercised </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightExercisedInPeriod" xlink:to="ziop_ClassOfWarrantOrRightExercisedInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightExercisePeriod" xlink:label="ziop_ClassOfWarrantOrRightExercisePeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightExercisePeriod_lbl" xml:lang="en-US" id="id_123082_543963_3_1"> Class of Warrant or Right, Exercise Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightExercisePeriod_lbl" xml:lang="en-US" id="id_123082_543963_1_1"> Class Of Warrant Or Right Exercise Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightExercisePeriod_lbl" xml:lang="en-US" id="id_123082_543963_2_1"> Warrant exercisable Period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightExercisePeriod" xlink:to="ziop_ClassOfWarrantOrRightExercisePeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights_lbl" xml:lang="en-US" id="id_123082_513649_1_1"> Class Of Warrant Or Right Exercise Price Of Warrants Or Rights </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights_lbl" xml:lang="en-US" id="id_123082_513649_2_1"> Warrant exercise price </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" xlink:to="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightExpiredInPeriod" xlink:label="ziop_ClassOfWarrantOrRightExpiredInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightExpiredInPeriod_lbl" xml:lang="en-US" id="id_123082_528976_3_1"> Class of Warrant or Right, Expired in Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightExpiredInPeriod_lbl" xml:lang="en-US" id="id_123082_528976_1_1"> Class Of Warrant Or Right Expired In Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightExpiredInPeriod_lbl" xml:lang="en-US" id="id_123082_528976_2_1"> Warrant expired </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightExpiredInPeriod" xlink:to="ziop_ClassOfWarrantOrRightExpiredInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedDividendYield" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedDividendYield"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedDividendYield_lbl" xml:lang="en-US" id="id_123082_540309_3_1"> Class of Warrant or Right, Fair Value Assumption, Expected Dividend Yield </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedDividendYield_lbl" xml:lang="en-US" id="id_123082_540309_1_1"> Class Of Warrant Or Right Fair Value Assumption Expected Dividend Yield </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedDividendYield_lbl" xml:lang="en-US" id="id_123082_540309_2_1"> Expected dividend yield </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedDividendYield" xlink:to="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedDividendYield_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife_lbl" xml:lang="en-US" id="id_123082_519161_3_1"> Class of Warrant or Right, Fair Value Assumption, Expected Life </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife_lbl" xml:lang="en-US" id="id_123082_519161_1_1"> Class Of Warrant Or Right Fair Value Assumption Expected Life </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife_lbl" xml:lang="en-US" id="id_123082_519161_2_1"> Expected life </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife_lbl" xml:lang="en-US" id="id_123082_519161_12_1"> Expected life in years </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife" xlink:to="ziop_ClassOfWarrantOrRightFairValueAssumptionExpectedLife_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate_lbl" xml:lang="en-US" id="id_123082_540311_3_1"> Class of Warrant or Right, Fair Value Assumption, Risk Free Interest Rate </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate_lbl" xml:lang="en-US" id="id_123082_540311_1_1"> Class Of Warrant Or Right Fair Value Assumption Risk Free Interest Rate </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate_lbl" xml:lang="en-US" id="id_123082_540311_2_1"> Risk free interest </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate_lbl" xml:lang="en-US" id="id_123082_540311_12_1"> Risk-free interest rate </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate" xlink:to="ziop_ClassOfWarrantOrRightFairValueAssumptionRiskFreeInterestRate_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightFairValueAssumptionStockVolatility" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionStockVolatility"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionStockVolatility_lbl" xml:lang="en-US" id="id_123082_540310_3_1"> Class of Warrant or Right, Fair Value Assumption, Stock Volatility </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionStockVolatility_lbl" xml:lang="en-US" id="id_123082_540310_1_1"> Class Of Warrant Or Right Fair Value Assumption Stock Volatility </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightFairValueAssumptionStockVolatility_lbl" xml:lang="en-US" id="id_123082_540310_2_1"> Expected volatility </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightFairValueAssumptionStockVolatility" xlink:to="ziop_ClassOfWarrantOrRightFairValueAssumptionStockVolatility_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantOrRightIssuedInPeriod" xlink:label="ziop_ClassOfWarrantOrRightIssuedInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantOrRightIssuedInPeriod_lbl" xml:lang="en-US" id="id_123082_543438_3_1"> Class of Warrant or Right, Issued in Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantOrRightIssuedInPeriod_lbl" xml:lang="en-US" id="id_123082_543438_1_1"> Class Of Warrant Or Right Issued In Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantOrRightIssuedInPeriod_lbl" xml:lang="en-US" id="id_123082_543438_2_1"> Warrant issued </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantOrRightIssuedInPeriod" xlink:to="ziop_ClassOfWarrantOrRightIssuedInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfWarrantOrRightLineItems" xlink:label="us-gaap_ClassOfWarrantOrRightLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightLineItems_lbl" xml:lang="en-US" id="id_123082_506450_1_1"> Class Of Warrant Or Right [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightLineItems_lbl" xml:lang="en-US" id="id_123082_506450_2_1"> Class of Warrant or Right [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightLineItems" xlink:to="us-gaap_ClassOfWarrantOrRightLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xml:lang="en-US" id="id_123082_504378_1_1"> Class Of Warrant Or Right Outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xml:lang="en-US" id="id_123082_504378_2_1"> Classified warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightOutstanding" xlink:to="us-gaap_ClassOfWarrantOrRightOutstanding_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfWarrantOrRightTable" xlink:label="us-gaap_ClassOfWarrantOrRightTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightTable_lbl" xml:lang="en-US" id="id_123082_514870_1_1"> Class Of Warrant Or Right [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightTable_lbl" xml:lang="en-US" id="id_123082_514870_2_1"> Class of Warrant or Right [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightTable" xlink:to="us-gaap_ClassOfWarrantOrRightTable_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ClassOfWarrantTerm" xlink:label="ziop_ClassOfWarrantTerm"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ClassOfWarrantTerm_lbl" xml:lang="en-US" id="id_123082_530157_3_1"> Class of Warrant Term </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ClassOfWarrantTerm_lbl" xml:lang="en-US" id="id_123082_530157_1_1"> Class Of Warrant Term </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ClassOfWarrantTerm_lbl" xml:lang="en-US" id="id_123082_530157_2_1"> Warrant term </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ClassOfWarrantTerm" xlink:to="ziop_ClassOfWarrantTerm_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CollaborationAgreementMember" xlink:label="ziop_CollaborationAgreementMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CollaborationAgreementMember_lbl" xml:lang="en-US" id="id_123082_535531_3_1"> Collaboration Agreement </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CollaborationAgreementMember_lbl" xml:lang="en-US" id="id_123082_535531_1_1"> Collaboration Agreement [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CollaborationAgreementMember_lbl" xml:lang="en-US" id="id_123082_535531_2_1"> Collaboration Agreement </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CollaborationAgreementMember" xlink:to="ziop_CollaborationAgreementMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CollaborativeAgreementAxis" xlink:label="ziop_CollaborativeAgreementAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CollaborativeAgreementAxis_lbl" xml:lang="en-US" id="id_123082_588826_3_1"> Collaborative Agreement [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CollaborativeAgreementAxis_lbl" xml:lang="en-US" id="id_123082_588826_1_1"> Collaborative Agreement [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CollaborativeAgreementAxis_lbl" xml:lang="en-US" id="id_123082_588826_2_1"> Collaborative Agreement [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CollaborativeAgreementAxis" xlink:to="ziop_CollaborativeAgreementAxis_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CollaborativeAgreementDomain" xlink:label="ziop_CollaborativeAgreementDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CollaborativeAgreementDomain_lbl" xml:lang="en-US" id="id_123082_589165_3_1"> Collaborative Agreement [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CollaborativeAgreementDomain_lbl" xml:lang="en-US" id="id_123082_589165_1_1"> Collaborative Agreement [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CollaborativeAgreementDomain_lbl" xml:lang="en-US" id="id_123082_589165_2_1"> Collaborative Agreement [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CollaborativeAgreementDomain" xlink:to="ziop_CollaborativeAgreementDomain_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CollaborativeArrangementAdditionalUpFrontPaymentToBeReceived" xlink:label="ziop_CollaborativeArrangementAdditionalUpFrontPaymentToBeReceived"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CollaborativeArrangementAdditionalUpFrontPaymentToBeReceived_lbl" xml:lang="en-US" id="id_123082_603783_3_1"> Collaborative Arrangement Additional UpFront Payment To Be Received </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CollaborativeArrangementAdditionalUpFrontPaymentToBeReceived_lbl" xml:lang="en-US" id="id_123082_603783_1_1"> Collaborative Arrangement Additional Up Front Payment To Be Received </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CollaborativeArrangementAdditionalUpFrontPaymentToBeReceived_lbl" xml:lang="en-US" id="id_123082_603783_2_1"> Expected Additional milestone payments to be received </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CollaborativeArrangementAdditionalUpFrontPaymentToBeReceived" xlink:to="ziop_CollaborativeArrangementAdditionalUpFrontPaymentToBeReceived_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CollaborativeArrangementAgreementResearchFundingPeriod" xlink:label="ziop_CollaborativeArrangementAgreementResearchFundingPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CollaborativeArrangementAgreementResearchFundingPeriod_lbl" xml:lang="en-US" id="id_123082_530090_3_1"> Collaborative Arrangement Agreement, Research Funding Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CollaborativeArrangementAgreementResearchFundingPeriod_lbl" xml:lang="en-US" id="id_123082_530090_1_1"> Collaborative Arrangement Agreement Research Funding Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CollaborativeArrangementAgreementResearchFundingPeriod_lbl" xml:lang="en-US" id="id_123082_530090_2_1"> Upfront payment for research and development funding earning period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CollaborativeArrangementAgreementResearchFundingPeriod" xlink:to="ziop_CollaborativeArrangementAgreementResearchFundingPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CollaborativeArrangementDisclosureTextBlock" xlink:label="us-gaap_CollaborativeArrangementDisclosureTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CollaborativeArrangementDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_499347_1_1"> Collaborative Arrangement Disclosure [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CollaborativeArrangementDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_499347_2_1"> Collaborations and Alliances </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CollaborativeArrangementDisclosureTextBlock" xlink:to="us-gaap_CollaborativeArrangementDisclosureTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommitmentAndContingenciesAxis" xlink:label="ziop_CommitmentAndContingenciesAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommitmentAndContingenciesAxis_lbl" xml:lang="en-US" id="id_123082_553597_3_1"> Commitment And Contingencies [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommitmentAndContingenciesAxis_lbl" xml:lang="en-US" id="id_123082_553597_1_1"> Commitment And Contingencies [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommitmentAndContingenciesAxis_lbl" xml:lang="en-US" id="id_123082_553597_2_1"> Commitment And Contingencies [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommitmentAndContingenciesAxis" xlink:to="ziop_CommitmentAndContingenciesAxis_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommitmentAndContingenciesDomain" xlink:label="ziop_CommitmentAndContingenciesDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommitmentAndContingenciesDomain_lbl" xml:lang="en-US" id="id_123082_554985_3_1"> Commitment And Contingencies [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommitmentAndContingenciesDomain_lbl" xml:lang="en-US" id="id_123082_554985_1_1"> Commitment And Contingencies [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommitmentAndContingenciesDomain_lbl" xml:lang="en-US" id="id_123082_554985_2_1"> Commitment And Contingencies [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommitmentAndContingenciesDomain" xlink:to="ziop_CommitmentAndContingenciesDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="us-gaap_CommitmentsAndContingencies"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xml:lang="en-US" id="id_123082_501924_1_1"> Commitments And Contingencies </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xml:lang="en-US" id="id_123082_501924_2_1"> Commitments and contingencies (note 7) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingencies" xlink:to="us-gaap_CommitmentsAndContingencies_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommitmentsAndContingenciesDisclosureLineItems" xlink:label="ziop_CommitmentsAndContingenciesDisclosureLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommitmentsAndContingenciesDisclosureLineItems_lbl" xml:lang="en-US" id="id_123082_518744_3_1"> Commitments and Contingencies Disclosure [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommitmentsAndContingenciesDisclosureLineItems_lbl" xml:lang="en-US" id="id_123082_518744_1_1"> Commitments And Contingencies Disclosure [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommitmentsAndContingenciesDisclosureLineItems_lbl" xml:lang="en-US" id="id_123082_518744_2_1"> Commitments and Contingencies Disclosure [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="ziop_CommitmentsAndContingenciesDisclosureLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommitmentsAndContingenciesDisclosureTable" xlink:label="ziop_CommitmentsAndContingenciesDisclosureTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommitmentsAndContingenciesDisclosureTable_lbl" xml:lang="en-US" id="id_123082_541670_3_1"> Commitments and Contingencies Disclosure [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommitmentsAndContingenciesDisclosureTable_lbl" xml:lang="en-US" id="id_123082_541670_1_1"> Commitments And Contingencies Disclosure [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommitmentsAndContingenciesDisclosureTable_lbl" xml:lang="en-US" id="id_123082_541670_2_1"> Commitments and Contingencies Disclosure [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommitmentsAndContingenciesDisclosureTable" xlink:to="ziop_CommitmentsAndContingenciesDisclosureTable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_512236_1_1"> Commitments And Contingencies Disclosure [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_512236_2_1"> Commitments and Contingencies </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommonStockDisclosureTextBlock" xlink:label="ziop_CommonStockDisclosureTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommonStockDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_538197_3_1"> Disclosure including description and financial information related to an entity's common stock and stock-based compensation, which may include disclosure of policies, compensation plan details, allocation of stock compensation, incentive distributions, deferred compensation arrangements and share repurchases. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommonStockDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_538197_1_1"> Common Stock Disclosure [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommonStockDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_538197_2_1"> Common Stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommonStockDisclosureTextBlock" xlink:to="ziop_CommonStockDisclosureTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommonStockIssuablePricePerShare" xlink:label="ziop_CommonStockIssuablePricePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommonStockIssuablePricePerShare_lbl" xml:lang="en-US" id="id_123082_539962_3_1"> Common Stock Issuable Price Per Share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommonStockIssuablePricePerShare_lbl" xml:lang="en-US" id="id_123082_539962_1_1"> Common Stock Issuable Price Per Share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommonStockIssuablePricePerShare_lbl" xml:lang="en-US" id="id_123082_539962_2_1"> Issuable price for common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommonStockIssuablePricePerShare" xlink:to="ziop_CommonStockIssuablePricePerShare_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockMember_lbl" xml:lang="en-US" id="id_123082_501348_1_1"> Common Stock [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockMember_lbl" xml:lang="en-US" id="id_123082_501348_2_1"> Common Stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockMember" xlink:to="us-gaap_CommonStockMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xml:lang="en-US" id="id_123082_512817_1_1"> Common Stock Par Or Stated Value Per Share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xml:lang="en-US" id="id_123082_512817_2_1"> Common stock, par value </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xml:lang="en-US" id="id_123082_502587_1_1"> Common Stock Shares Authorized </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xml:lang="en-US" id="id_123082_502587_2_1"> Common stock, shares authorized </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US" id="id_123082_510226_1_1"> Common Stock Shares Issued </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US" id="id_123082_510226_2_1"> Common stock, shares issued </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_504150_1_1"> Common Stock Shares Outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_504150_2_1"> Common stock, shares outstanding </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US" id="id_123082_512456_1_1"> Common Stock Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US" id="id_123082_512456_2_1"> Common stock, $0.001 par value; 250,000,000 shares authorized; 79,625,290 and 69,206,044 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommonStockWarrantExercisePrice" xlink:label="ziop_CommonStockWarrantExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommonStockWarrantExercisePrice_lbl" xml:lang="en-US" id="id_123082_584275_3_1"> Common Stock Warrant Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommonStockWarrantExercisePrice_lbl" xml:lang="en-US" id="id_123082_584275_1_1"> Common Stock Warrant Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommonStockWarrantExercisePrice_lbl" xml:lang="en-US" id="id_123082_584275_2_1"> Common stock warrants exercise price </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommonStockWarrantExercisePrice" xlink:to="ziop_CommonStockWarrantExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_CommonStockWarrantsFairValue" xlink:label="ziop_CommonStockWarrantsFairValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_CommonStockWarrantsFairValue_lbl" xml:lang="en-US" id="id_123082_527565_3_1"> Common Stock Warrants, Fair Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_CommonStockWarrantsFairValue_lbl" xml:lang="en-US" id="id_123082_527565_1_1"> Common Stock Warrants Fair Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_CommonStockWarrantsFairValue_lbl" xml:lang="en-US" id="id_123082_527565_2_1"> Fair value of warrant </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_CommonStockWarrantsFairValue" xlink:to="ziop_CommonStockWarrantsFairValue_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ConsultingFees" xlink:label="ziop_ConsultingFees"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ConsultingFees_lbl" xml:lang="en-US" id="id_123082_523926_3_1"> Consulting fees </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ConsultingFees_lbl" xml:lang="en-US" id="id_123082_523926_1_1"> Consulting Fees </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ConsultingFees_lbl" xml:lang="en-US" id="id_123082_523926_2_1"> Payment for consulting services fee </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ConsultingFees" xlink:to="ziop_ConsultingFees_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ContingentConsiderationByTypeAxis" xlink:label="us-gaap_ContingentConsiderationByTypeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContingentConsiderationByTypeAxis_lbl" xml:lang="en-US" id="id_123082_499645_1_1"> Contingent Consideration By Type [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContingentConsiderationByTypeAxis_lbl" xml:lang="en-US" id="id_123082_499645_2_1"> Contingent Consideration by Type [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContingentConsiderationByTypeAxis" xlink:to="us-gaap_ContingentConsiderationByTypeAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="us-gaap_ContingentConsiderationTypeDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContingentConsiderationTypeDomain_lbl" xml:lang="en-US" id="id_123082_512447_1_1"> Contingent Consideration Type [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContingentConsiderationTypeDomain_lbl" xml:lang="en-US" id="id_123082_512447_2_1"> Contingent Consideration Type [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContingentConsiderationTypeDomain" xlink:to="us-gaap_ContingentConsiderationTypeDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ContractRevenueCost" xlink:label="us-gaap_ContractRevenueCost"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractRevenueCost_lbl" xml:lang="en-US" id="id_123082_503129_1_1"> Contract Revenue Cost </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContractRevenueCost_lbl" xml:lang="en-US" id="id_123082_503129_2_1"> Payments for services </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractRevenueCost" xlink:to="us-gaap_ContractRevenueCost_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ContractsRevenue" xlink:label="us-gaap_ContractsRevenue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractsRevenue_lbl" xml:lang="en-US" id="id_123082_500315_1_1"> Contracts Revenue </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContractsRevenue_lbl" xml:lang="en-US" id="id_123082_500315_2_1"> Research contract revenue </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractsRevenue" xlink:to="us-gaap_ContractsRevenue_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ContractTerminationDescription" xlink:label="ziop_ContractTerminationDescription"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ContractTerminationDescription_lbl" xml:lang="en-US" id="id_123082_529222_3_1"> Contract Termination, Description </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ContractTerminationDescription_lbl" xml:lang="en-US" id="id_123082_529222_1_1"> Contract Termination Description </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ContractTerminationDescription_lbl" xml:lang="en-US" id="id_123082_529222_2_1"> Contract termination description </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ContractTerminationDescription" xlink:to="ziop_ContractTerminationDescription_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConversionOfStockAmountConverted1" xlink:label="us-gaap_ConversionOfStockAmountConverted1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConversionOfStockAmountConverted1_lbl" xml:lang="en-US" id="id_123082_511881_1_1"> Conversion Of Stock Amount Converted 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ConversionOfStockAmountConverted1_lbl" xml:lang="en-US" id="id_123082_511881_2_1"> Preferred stock conversion/exercise of equity-classified warrants to common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConversionOfStockAmountConverted1" xlink:to="us-gaap_ConversionOfStockAmountConverted1_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConvertiblePreferredStockMember" xlink:label="us-gaap_ConvertiblePreferredStockMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConvertiblePreferredStockMember_lbl" xml:lang="en-US" id="id_123082_503547_1_1"> Convertible Preferred Stock [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ConvertiblePreferredStockMember_lbl" xml:lang="en-US" id="id_123082_503547_2_1"> Convertible Preferred Stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConvertiblePreferredStockMember" xlink:to="us-gaap_ConvertiblePreferredStockMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostOfServicesLicensesAndMaintenanceAgreements" xlink:label="us-gaap_CostOfServicesLicensesAndMaintenanceAgreements"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CostOfServicesLicensesAndMaintenanceAgreements_lbl" xml:lang="en-US" id="id_123082_506048_1_1"> Cost Of Services Licenses And Maintenance Agreements </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CostOfServicesLicensesAndMaintenanceAgreements_lbl" xml:lang="en-US" id="id_123082_506048_2_1"> Annual patent and license prosecution/maintenance fee </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CostOfServicesLicensesAndMaintenanceAgreements" xlink:to="us-gaap_CostOfServicesLicensesAndMaintenanceAgreements_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US" id="id_123082_497832_1_1"> Current Fiscal Year End Date </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US" id="id_123082_497832_2_1"> Current Fiscal Year End Date </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl" xml:lang="en-US" id="id_123082_502942_1_1"> Debt Conversion Converted Instrument Amount 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl" xml:lang="en-US" id="id_123082_502942_2_1"> Exercise of liability-classified warrants to common shares </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:to="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredRentCreditCurrent" xlink:label="us-gaap_DeferredRentCreditCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredRentCreditCurrent_lbl" xml:lang="en-US" id="id_123082_511775_1_1"> Deferred Rent Credit Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DeferredRentCreditCurrent_lbl" xml:lang="en-US" id="id_123082_511775_2_1"> Deferred rent - current portion </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredRentCreditCurrent" xlink:to="us-gaap_DeferredRentCreditCurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredRentCreditNoncurrent" xlink:label="us-gaap_DeferredRentCreditNoncurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredRentCreditNoncurrent_lbl" xml:lang="en-US" id="id_123082_512535_1_1"> Deferred Rent Credit Noncurrent </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DeferredRentCreditNoncurrent_lbl" xml:lang="en-US" id="id_123082_512535_2_1"> Deferred rent </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredRentCreditNoncurrent" xlink:to="us-gaap_DeferredRentCreditNoncurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="us-gaap_DeferredRevenueCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xml:lang="en-US" id="id_123082_506610_1_1"> Deferred Revenue Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xml:lang="en-US" id="id_123082_506610_2_1"> Deferred revenue - current portion </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredRevenueCurrent" xlink:to="us-gaap_DeferredRevenueCurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="us-gaap_DeferredRevenueNoncurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredRevenueNoncurrent_lbl" xml:lang="en-US" id="id_123082_512938_1_1"> Deferred Revenue Noncurrent </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DeferredRevenueNoncurrent_lbl" xml:lang="en-US" id="id_123082_512938_2_1"> Deferred revenue </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredRevenueNoncurrent" xlink:to="us-gaap_DeferredRevenueNoncurrent_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DEKKTecIncMember" xlink:label="ziop_DEKKTecIncMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DEKKTecIncMember_lbl" xml:lang="en-US" id="id_123082_603794_3_1"> DEKK Tec Inc </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DEKKTecIncMember_lbl" xml:lang="en-US" id="id_123082_603794_1_1"> D E K K Tec Inc [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DEKKTecIncMember_lbl" xml:lang="en-US" id="id_123082_603794_2_1"> DEKK Tec Inc </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DEKKTecIncMember" xlink:to="ziop_DEKKTecIncMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DepositsAssetsNoncurrent" xlink:label="us-gaap_DepositsAssetsNoncurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepositsAssetsNoncurrent_lbl" xml:lang="en-US" id="id_123082_508116_1_1"> Deposits Assets Noncurrent </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DepositsAssetsNoncurrent_lbl" xml:lang="en-US" id="id_123082_508116_2_1"> Deposits </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepositsAssetsNoncurrent" xlink:to="us-gaap_DepositsAssetsNoncurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="us-gaap_DepreciationAndAmortization"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepreciationAndAmortization_lbl" xml:lang="en-US" id="id_123082_503722_1_1"> Depreciation And Amortization </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DepreciationAndAmortization_lbl" xml:lang="en-US" id="id_123082_503722_2_1"> Depreciation and amortization </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepreciationAndAmortization" xlink:to="us-gaap_DepreciationAndAmortization_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DevelopmentMilestonePaymentsMember" xlink:label="ziop_DevelopmentMilestonePaymentsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DevelopmentMilestonePaymentsMember_lbl" xml:lang="en-US" id="id_123082_588173_3_1"> Development Milestone Payments </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DevelopmentMilestonePaymentsMember_lbl" xml:lang="en-US" id="id_123082_588173_1_1"> Development Milestone Payments [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DevelopmentMilestonePaymentsMember_lbl" xml:lang="en-US" id="id_123082_588173_2_1"> Development-based milestones </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DevelopmentMilestonePaymentsMember" xlink:to="ziop_DevelopmentMilestonePaymentsMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage" xlink:label="us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage_lbl" xml:lang="en-US" id="id_123082_506841_1_1"> Development Stage Enterprise Deficit Accumulated During Development Stage </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage_lbl" xml:lang="en-US" id="id_123082_506841_8_1"> Deficit accumulated during the development stage </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage" xlink:to="us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAbstract" xlink:label="ziop_DisclosureAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAbstract_lbl" xml:lang="en-US" id="id_123082_605026_3_1"> Disclosure - Assets and Liabilities Measured at Fair Value on Recurring Basis [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAbstract_lbl" xml:lang="en-US" id="id_123082_605026_1_1"> Disclosure Assets And Liabilities Measured At Fair Value On Recurring Basis [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAbstract_lbl" xml:lang="en-US" id="id_123082_605026_2_1"> Disclosure - Assets and Liabilities Measured at Fair Value on Recurring Basis [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAbstract" xlink:to="ziop_DisclosureAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureAssumptionsUsedInBinomialValuationModelAndBlackScholesValuationModelAbstract" xlink:label="ziop_DisclosureAssumptionsUsedInBinomialValuationModelAndBlackScholesValuationModelAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureAssumptionsUsedInBinomialValuationModelAndBlackScholesValuationModelAbstract_lbl" xml:lang="en-US" id="id_123082_605027_3_1"> Disclosure - Assumptions Used In Binomial Valuation Model and Black-Scholes Valuation Model [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureAssumptionsUsedInBinomialValuationModelAndBlackScholesValuationModelAbstract_lbl" xml:lang="en-US" id="id_123082_605027_1_1"> Disclosure Assumptions Used In Binomial Valuation Model And Black Scholes Valuation Model [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureAssumptionsUsedInBinomialValuationModelAndBlackScholesValuationModelAbstract_lbl" xml:lang="en-US" id="id_123082_605027_2_1"> Disclosure - Assumptions Used In Binomial Valuation Model and Black-Scholes Valuation Model [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureAssumptionsUsedInBinomialValuationModelAndBlackScholesValuationModelAbstract" xlink:to="ziop_DisclosureAssumptionsUsedInBinomialValuationModelAndBlackScholesValuationModelAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureBusinessAdditionalInformationAbstract" xlink:label="ziop_DisclosureBusinessAdditionalInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureBusinessAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605028_3_1"> Disclosure - Business - Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureBusinessAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605028_1_1"> Disclosure Business Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureBusinessAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605028_2_1"> Disclosure - Business - Additional Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureBusinessAdditionalInformationAbstract" xlink:to="ziop_DisclosureBusinessAdditionalInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureCollaborationsAndAlliancesAdditionalInformationAbstract" xlink:label="ziop_DisclosureCollaborationsAndAlliancesAdditionalInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureCollaborationsAndAlliancesAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605029_3_1"> Disclosure - Collaborations and Alliances - Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureCollaborationsAndAlliancesAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605029_1_1"> Disclosure Collaborations And Alliances Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureCollaborationsAndAlliancesAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605029_2_1"> Disclosure - Collaborations and Alliances - Additional Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureCollaborationsAndAlliancesAdditionalInformationAbstract" xlink:to="ziop_DisclosureCollaborationsAndAlliancesAdditionalInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" xlink:label="ziop_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_604551_3_1"> Disclosure Commitments And Contingencies Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_604551_1_1"> Disclosure Commitments And Contingencies Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_604551_2_1"> Disclosure Commitments And Contingencies Additional Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" xlink:to="ziop_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureCommonStockAdditionalInformationAbstract" xlink:label="ziop_DisclosureCommonStockAdditionalInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureCommonStockAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605030_3_1"> Disclosure - Common Stock - Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureCommonStockAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605030_1_1"> Disclosure Common Stock Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureCommonStockAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605030_2_1"> Disclosure - Common Stock - Additional Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureCommonStockAdditionalInformationAbstract" xlink:to="ziop_DisclosureCommonStockAdditionalInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureFairValueOfStockOptionsAssumptionsUsingBlackScholesOptionValuationModelAbstract" xlink:label="ziop_DisclosureFairValueOfStockOptionsAssumptionsUsingBlackScholesOptionValuationModelAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureFairValueOfStockOptionsAssumptionsUsingBlackScholesOptionValuationModelAbstract_lbl" xml:lang="en-US" id="id_123082_605031_3_1"> Disclosure - Fair Value of Stock Options Assumptions Using Black-Scholes Option Valuation Model [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureFairValueOfStockOptionsAssumptionsUsingBlackScholesOptionValuationModelAbstract_lbl" xml:lang="en-US" id="id_123082_605031_1_1"> Disclosure Fair Value Of Stock Options Assumptions Using Black Scholes Option Valuation Model [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureFairValueOfStockOptionsAssumptionsUsingBlackScholesOptionValuationModelAbstract_lbl" xml:lang="en-US" id="id_123082_605031_2_1"> Disclosure - Fair Value of Stock Options Assumptions Using Black-Scholes Option Valuation Model [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureFairValueOfStockOptionsAssumptionsUsingBlackScholesOptionValuationModelAbstract" xlink:to="ziop_DisclosureFairValueOfStockOptionsAssumptionsUsingBlackScholesOptionValuationModelAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureNumberOfWarrantsOutstandingAbstract" xlink:label="ziop_DisclosureNumberOfWarrantsOutstandingAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureNumberOfWarrantsOutstandingAbstract_lbl" xml:lang="en-US" id="id_123082_605032_3_1"> Disclosure - Number of Warrants Outstanding [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureNumberOfWarrantsOutstandingAbstract_lbl" xml:lang="en-US" id="id_123082_605032_1_1"> Disclosure Number Of Warrants Outstanding [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureNumberOfWarrantsOutstandingAbstract_lbl" xml:lang="en-US" id="id_123082_605032_2_1"> Disclosure - Number of Warrants Outstanding [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureNumberOfWarrantsOutstandingAbstract" xlink:to="ziop_DisclosureNumberOfWarrantsOutstandingAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xml:lang="en-US" id="id_123082_514093_1_1"> Disclosure Of Compensation Related Costs Share Based Payments [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xml:lang="en-US" id="id_123082_514093_2_1"> Stock-Based Compensation </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:to="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:label="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_lbl" xml:lang="en-US" id="id_123082_514014_1_1"> Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_lbl" xml:lang="en-US" id="id_123082_514014_2_1"> Stock-Based Compensation Expense on All Employee and Non-Employee Awards </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:to="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosurePotentialDilutiveSharesExcludedFromComputationOfDilutedNetLossPerShareAbstract" xlink:label="ziop_DisclosurePotentialDilutiveSharesExcludedFromComputationOfDilutedNetLossPerShareAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosurePotentialDilutiveSharesExcludedFromComputationOfDilutedNetLossPerShareAbstract_lbl" xml:lang="en-US" id="id_123082_605033_3_1"> Disclosure - Potential Dilutive Shares Excluded from Computation of Diluted Net Loss Per Share [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosurePotentialDilutiveSharesExcludedFromComputationOfDilutedNetLossPerShareAbstract_lbl" xml:lang="en-US" id="id_123082_605033_1_1"> Disclosure Potential Dilutive Shares Excluded From Computation Of Diluted Net Loss Per Share [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosurePotentialDilutiveSharesExcludedFromComputationOfDilutedNetLossPerShareAbstract_lbl" xml:lang="en-US" id="id_123082_605033_2_1"> Disclosure - Potential Dilutive Shares Excluded from Computation of Diluted Net Loss Per Share [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosurePotentialDilutiveSharesExcludedFromComputationOfDilutedNetLossPerShareAbstract" xlink:to="ziop_DisclosurePotentialDilutiveSharesExcludedFromComputationOfDilutedNetLossPerShareAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" xlink:label="ziop_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605034_3_1"> Disclosure - Related Party Transactions - Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605034_1_1"> Disclosure Related Party Transactions Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605034_2_1"> Disclosure - Related Party Transactions - Additional Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" xlink:to="ziop_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureStockBasedCompensationAdditionalInformationAbstract" xlink:label="ziop_DisclosureStockBasedCompensationAdditionalInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureStockBasedCompensationAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605035_3_1"> Disclosure - Stock-Based Compensation - Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureStockBasedCompensationAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605035_1_1"> Disclosure Stock Based Compensation Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureStockBasedCompensationAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605035_2_1"> Disclosure - Stock-Based Compensation - Additional Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureStockBasedCompensationAdditionalInformationAbstract" xlink:to="ziop_DisclosureStockBasedCompensationAdditionalInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureStockBasedCompensationExpenseOnAllEmployeeAndNonEmployeeAwardsAbstract" xlink:label="ziop_DisclosureStockBasedCompensationExpenseOnAllEmployeeAndNonEmployeeAwardsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureStockBasedCompensationExpenseOnAllEmployeeAndNonEmployeeAwardsAbstract_lbl" xml:lang="en-US" id="id_123082_605036_3_1"> Disclosure - Stock-Based Compensation Expense on All Employee and Non-Employee Awards [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureStockBasedCompensationExpenseOnAllEmployeeAndNonEmployeeAwardsAbstract_lbl" xml:lang="en-US" id="id_123082_605036_1_1"> Disclosure Stock Based Compensation Expense On All Employee And Non Employee Awards [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureStockBasedCompensationExpenseOnAllEmployeeAndNonEmployeeAwardsAbstract_lbl" xml:lang="en-US" id="id_123082_605036_2_1"> Disclosure - Stock-Based Compensation Expense on All Employee and Non-Employee Awards [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureStockBasedCompensationExpenseOnAllEmployeeAndNonEmployeeAwardsAbstract" xlink:to="ziop_DisclosureStockBasedCompensationExpenseOnAllEmployeeAndNonEmployeeAwardsAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureStockOptionActivityUnderStockOptionPlanAbstract" xlink:label="ziop_DisclosureStockOptionActivityUnderStockOptionPlanAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureStockOptionActivityUnderStockOptionPlanAbstract_lbl" xml:lang="en-US" id="id_123082_605037_3_1"> Disclosure - Stock Option Activity Under Stock Option Plan [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureStockOptionActivityUnderStockOptionPlanAbstract_lbl" xml:lang="en-US" id="id_123082_605037_1_1"> Disclosure Stock Option Activity Under Stock Option Plan [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureStockOptionActivityUnderStockOptionPlanAbstract_lbl" xml:lang="en-US" id="id_123082_605037_2_1"> Disclosure - Stock Option Activity Under Stock Option Plan [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureStockOptionActivityUnderStockOptionPlanAbstract" xlink:to="ziop_DisclosureStockOptionActivityUnderStockOptionPlanAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureSummaryOfUnvestedRestrictedStockAbstract" xlink:label="ziop_DisclosureSummaryOfUnvestedRestrictedStockAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureSummaryOfUnvestedRestrictedStockAbstract_lbl" xml:lang="en-US" id="id_123082_605038_3_1"> Disclosure - Summary of Unvested Restricted Stock [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureSummaryOfUnvestedRestrictedStockAbstract_lbl" xml:lang="en-US" id="id_123082_605038_1_1"> Disclosure Summary Of Unvested Restricted Stock [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureSummaryOfUnvestedRestrictedStockAbstract_lbl" xml:lang="en-US" id="id_123082_605038_2_1"> Disclosure - Summary of Unvested Restricted Stock [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureSummaryOfUnvestedRestrictedStockAbstract" xlink:to="ziop_DisclosureSummaryOfUnvestedRestrictedStockAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureWarrantExerciseAbstract" xlink:label="ziop_DisclosureWarrantExerciseAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureWarrantExerciseAbstract_lbl" xml:lang="en-US" id="id_123082_605039_3_1"> Disclosure - Warrant Exercise [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureWarrantExerciseAbstract_lbl" xml:lang="en-US" id="id_123082_605039_1_1"> Disclosure Warrant Exercise [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureWarrantExerciseAbstract_lbl" xml:lang="en-US" id="id_123082_605039_2_1"> Disclosure - Warrant Exercise [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureWarrantExerciseAbstract" xlink:to="ziop_DisclosureWarrantExerciseAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DisclosureWarrantsAdditionalInformationAbstract" xlink:label="ziop_DisclosureWarrantsAdditionalInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DisclosureWarrantsAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605040_3_1"> Disclosure - Warrants - Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DisclosureWarrantsAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605040_1_1"> Disclosure Warrants Additional Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DisclosureWarrantsAdditionalInformationAbstract_lbl" xml:lang="en-US" id="id_123082_605040_2_1"> Disclosure - Warrants - Additional Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DisclosureWarrantsAdditionalInformationAbstract" xlink:to="ziop_DisclosureWarrantsAdditionalInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_DocumentDocumentandEntityInformationAbstract" xlink:label="ziop_DocumentDocumentandEntityInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_DocumentDocumentandEntityInformationAbstract_lbl" xml:lang="en-US" id="id_123082_604557_3_1"> Document Documentand Entity Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_DocumentDocumentandEntityInformationAbstract_lbl" xml:lang="en-US" id="id_123082_604557_1_1"> Document Documentand Entity Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_DocumentDocumentandEntityInformationAbstract_lbl" xml:lang="en-US" id="id_123082_604557_2_1"> Document Documentand Entity Information [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_DocumentDocumentandEntityInformationAbstract" xlink:to="ziop_DocumentDocumentandEntityInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US" id="id_123082_497755_1_1"> Document Fiscal Period Focus </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US" id="id_123082_497755_2_1"> Document Fiscal Period Focus </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US" id="id_123082_497802_1_1"> Document Fiscal Year Focus </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US" id="id_123082_497802_2_1"> Document Fiscal Year Focus </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentInformationLineItems" xlink:label="dei_DocumentInformationLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentInformationLineItems_lbl" xml:lang="en-US" id="id_123082_497700_1_1"> Document Information [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentInformationLineItems_lbl" xml:lang="en-US" id="id_123082_497700_2_1"> Document Information [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentInformationLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US" id="id_123082_497817_1_1"> Document Period End Date </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US" id="id_123082_497817_2_1"> Document Period End Date </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US" id="id_123082_497812_1_1"> Document Type </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentType_lbl" xml:lang="en-US" id="id_123082_497812_2_1"> Document Type </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="us-gaap_EarningsPerShareBasic"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US" id="id_123082_507817_1_1"> Earnings Per Share Basic </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US" id="id_123082_507817_2_1"> Net income (loss) per share - basic </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="us-gaap_EarningsPerShareDiluted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xml:lang="en-US" id="id_123082_501536_1_1"> Earnings Per Share Diluted </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xml:lang="en-US" id="id_123082_501536_2_1"> Net income (loss) per share - diluted </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="us-gaap_EarningsPerShareTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xml:lang="en-US" id="id_123082_501344_1_1"> Earnings Per Share [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xml:lang="en-US" id="id_123082_501344_2_1"> Net Loss per Share </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareTextBlock" xlink:to="us-gaap_EarningsPerShareTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_lbl" xml:lang="en-US" id="id_123082_504933_1_1"> Employee Service Share Based Compensation Allocation Of Recognized Period Costs Report Line [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_lbl" xml:lang="en-US" id="id_123082_504933_2_1"> Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xml:lang="en-US" id="id_123082_502045_1_1"> Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xml:lang="en-US" id="id_123082_502045_2_1"> Unrecognized compensation costs </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xml:lang="en-US" id="id_123082_507102_1_1"> Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xml:lang="en-US" id="id_123082_507102_2_1"> Expected recognition period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="us-gaap_EmployeeSeveranceMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeSeveranceMember_lbl" xml:lang="en-US" id="id_123082_512888_1_1"> Employee Severance [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EmployeeSeveranceMember_lbl" xml:lang="en-US" id="id_123082_512888_2_1"> Severance and Health Benefit Continuation Costs </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeSeveranceMember" xlink:to="us-gaap_EmployeeSeveranceMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_EndOfPeriodMember" xlink:label="ziop_EndOfPeriodMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_EndOfPeriodMember_lbl" xml:lang="en-US" id="id_123082_531072_3_1"> End of Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_EndOfPeriodMember_lbl" xml:lang="en-US" id="id_123082_531072_1_1"> End Of Period [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_EndOfPeriodMember_lbl" xml:lang="en-US" id="id_123082_531072_2_1"> End of Period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_EndOfPeriodMember" xlink:to="ziop_EndOfPeriodMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntitiesTable" xlink:label="dei_EntitiesTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntitiesTable_lbl" xml:lang="en-US" id="id_123082_497721_1_1"> Entities [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntitiesTable_lbl" xml:lang="en-US" id="id_123082_497721_2_1"> Entities [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntitiesTable" xlink:to="dei_EntitiesTable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US" id="id_123082_497825_1_1"> Entity Central Index Key </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US" id="id_123082_497825_2_1"> Entity Central Index Key </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_497778_1_1"> Entity Common Stock Shares Outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_497778_2_1"> Entity Common Stock, Shares Outstanding </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCommonStockSharesOutstanding" xlink:to="dei_EntityCommonStockSharesOutstanding_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityDomain_lbl" xml:lang="en-US" id="id_123082_497798_1_1"> Entity [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityDomain_lbl" xml:lang="en-US" id="id_123082_497798_2_1"> Entity [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityDomain" xlink:to="dei_EntityDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityFilerCategory" xlink:label="dei_EntityFilerCategory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFilerCategory_lbl" xml:lang="en-US" id="id_123082_497731_1_1"> Entity Filer Category </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityFilerCategory_lbl" xml:lang="en-US" id="id_123082_497731_2_1"> Entity Filer Category </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFilerCategory" xlink:to="dei_EntityFilerCategory_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US" id="id_123082_497713_1_1"> Entity Registrant Name </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US" id="id_123082_497713_2_1"> Entity Registrant Name </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquityComponentDomain_lbl" xml:lang="en-US" id="id_123082_501491_1_1"> Equity Component [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EquityComponentDomain_lbl" xml:lang="en-US" id="id_123082_501491_2_1"> Equity Component [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_EquityComponentDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityMember" xlink:label="us-gaap_EquityMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquityMember_lbl" xml:lang="en-US" id="id_123082_504830_1_1"> Equity [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EquityMember_lbl" xml:lang="en-US" id="id_123082_504830_2_1"> Equity </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityMember" xlink:to="us-gaap_EquityMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_EquityWarrantAssetMember" xlink:label="ziop_EquityWarrantAssetMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_EquityWarrantAssetMember_lbl" xml:lang="en-US" id="id_123082_533570_3_1"> Equity Warrant Asset </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_EquityWarrantAssetMember_lbl" xml:lang="en-US" id="id_123082_533570_1_1"> Equity Warrant Asset [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_EquityWarrantAssetMember_lbl" xml:lang="en-US" id="id_123082_533570_2_1"> Equity Warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_EquityWarrantAssetMember" xlink:to="ziop_EquityWarrantAssetMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ExecutionOfSubscriptionAgreementMember" xlink:label="ziop_ExecutionOfSubscriptionAgreementMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ExecutionOfSubscriptionAgreementMember_lbl" xml:lang="en-US" id="id_123082_534110_3_1"> Execution of Subscription Agreement </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ExecutionOfSubscriptionAgreementMember_lbl" xml:lang="en-US" id="id_123082_534110_1_1"> Execution Of Subscription Agreement [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ExecutionOfSubscriptionAgreementMember_lbl" xml:lang="en-US" id="id_123082_534110_2_1"> Execution Agreement </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ExecutionOfSubscriptionAgreementMember" xlink:to="ziop_ExecutionOfSubscriptionAgreementMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems_lbl" xml:lang="en-US" id="id_123082_519055_3_1"> Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems_lbl" xml:lang="en-US" id="id_123082_519055_1_1"> Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems_lbl" xml:lang="en-US" id="id_123082_519055_2_1"> Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" xlink:to="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable_lbl" xml:lang="en-US" id="id_123082_530482_3_1"> Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable_lbl" xml:lang="en-US" id="id_123082_530482_1_1"> Fair Value Assets And Liabilities Measured On Recurring Basis [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable_lbl" xml:lang="en-US" id="id_123082_530482_2_1"> Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" xlink:to="ziop_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xml:lang="en-US" id="id_123082_510142_1_1"> Fair Value By Fair Value Hierarchy Level [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xml:lang="en-US" id="id_123082_510142_2_1"> Fair Value, Hierarchy [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="us-gaap_FairValueDisclosuresTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xml:lang="en-US" id="id_123082_502694_1_1"> Fair Value Disclosures [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xml:lang="en-US" id="id_123082_502694_2_1"> Fair Value Measurements </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueDisclosuresTextBlock" xlink:to="us-gaap_FairValueDisclosuresTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xml:lang="en-US" id="id_123082_508799_1_1"> Fair Value Inputs Level 1 [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xml:lang="en-US" id="id_123082_508799_2_1"> Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel1Member" xlink:to="us-gaap_FairValueInputsLevel1Member_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xml:lang="en-US" id="id_123082_511009_1_1"> Fair Value Inputs Level 2 [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xml:lang="en-US" id="id_123082_511009_2_1"> Significant Other Observable In puts (Level 2) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel2Member" xlink:to="us-gaap_FairValueInputsLevel2Member_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xml:lang="en-US" id="id_123082_501136_1_1"> Fair Value Measurements Fair Value Hierarchy [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xml:lang="en-US" id="id_123082_501136_2_1"> Fair Value, Measurements, Fair Value Hierarchy [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xml:lang="en-US" id="id_123082_511480_1_1"> Gain Loss On Sale Of Property Plant Equipment </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xml:lang="en-US" id="id_123082_511480_8_1"> Loss on disposal of fixed assets </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:to="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="us-gaap_GeneralAndAdministrativeExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xml:lang="en-US" id="id_123082_506093_1_1"> General And Administrative Expense </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xml:lang="en-US" id="id_123082_506093_2_1"> General and administrative </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeneralAndAdministrativeExpense" xlink:to="us-gaap_GeneralAndAdministrativeExpense_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xml:lang="en-US" id="id_123082_510320_1_1"> General And Administrative Expense [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xml:lang="en-US" id="id_123082_510320_2_1"> General and Administrative Expense </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeneralAndAdministrativeExpenseMember" xlink:to="us-gaap_GeneralAndAdministrativeExpenseMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupEightMember" xlink:label="ziop_GroupEightMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupEightMember_lbl" xml:lang="en-US" id="id_123082_537113_3_1"> Group Eight </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupEightMember_lbl" xml:lang="en-US" id="id_123082_537113_1_1"> Group Eight [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupEightMember_lbl" xml:lang="en-US" id="id_123082_537113_2_1"> Upon initial clinical study enrollment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupEightMember" xlink:to="ziop_GroupEightMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupElevenMember" xlink:label="ziop_GroupElevenMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupElevenMember_lbl" xml:lang="en-US" id="id_123082_537116_3_1"> Group Eleven </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupElevenMember_lbl" xml:lang="en-US" id="id_123082_537116_1_1"> Group Eleven [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupElevenMember_lbl" xml:lang="en-US" id="id_123082_537116_2_1"> Upon work order execution </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupElevenMember" xlink:to="ziop_GroupElevenMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupFiveMember" xlink:label="ziop_GroupFiveMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupFiveMember_lbl" xml:lang="en-US" id="id_123082_537110_3_1"> Group Five </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupFiveMember_lbl" xml:lang="en-US" id="id_123082_537110_1_1"> Group Five [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupFiveMember_lbl" xml:lang="en-US" id="id_123082_537110_2_1"> Upon the successful U.S. IND application for indibulin </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupFiveMember" xlink:to="ziop_GroupFiveMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupFourMember" xlink:label="ziop_GroupFourMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupFourMember_lbl" xml:lang="en-US" id="id_123082_537109_3_1"> Group Four </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupFourMember_lbl" xml:lang="en-US" id="id_123082_537109_1_1"> Group Four [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupFourMember_lbl" xml:lang="en-US" id="id_123082_537109_2_1"> Upon receiving a United States Patent for palifosfamide </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupFourMember" xlink:to="ziop_GroupFourMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupNineMember" xlink:label="ziop_GroupNineMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupNineMember_lbl" xml:lang="en-US" id="id_123082_537114_3_1"> Group Nine </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupNineMember_lbl" xml:lang="en-US" id="id_123082_537114_1_1"> Group Nine [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupNineMember_lbl" xml:lang="en-US" id="id_123082_537114_2_1"> Execution of letter of intent </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupNineMember" xlink:to="ziop_GroupNineMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupOneMember" xlink:label="ziop_GroupOneMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupOneMember_lbl" xml:lang="en-US" id="id_123082_537106_3_1"> Group One </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupOneMember_lbl" xml:lang="en-US" id="id_123082_537106_1_1"> Group One [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupOneMember_lbl" xml:lang="en-US" id="id_123082_537106_2_1"> Upon the filing of an Investigation New Drug application (IND) for darinaparsin </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupOneMember" xlink:to="ziop_GroupOneMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupSevenMember" xlink:label="ziop_GroupSevenMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupSevenMember_lbl" xml:lang="en-US" id="id_123082_537112_3_1"> Group Seven </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupSevenMember_lbl" xml:lang="en-US" id="id_123082_537112_1_1"> Group Seven [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupSevenMember_lbl" xml:lang="en-US" id="id_123082_537112_2_1"> Upon contract execution </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupSevenMember" xlink:to="ziop_GroupSevenMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupSixMember" xlink:label="ziop_GroupSixMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupSixMember_lbl" xml:lang="en-US" id="id_123082_537111_3_1"> Group Six </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupSixMember_lbl" xml:lang="en-US" id="id_123082_537111_1_1"> Group Six [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupSixMember_lbl" xml:lang="en-US" id="id_123082_537111_2_1"> Upon a clinical study commencement of enrollment in North America </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupSixMember" xlink:to="ziop_GroupSixMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupTenMember" xlink:label="ziop_GroupTenMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupTenMember_lbl" xml:lang="en-US" id="id_123082_537115_3_1"> Group Ten </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupTenMember_lbl" xml:lang="en-US" id="id_123082_537115_1_1"> Group Ten [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupTenMember_lbl" xml:lang="en-US" id="id_123082_537115_2_1"> Upon execution of extensions of the foregoing letter of intent </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupTenMember" xlink:to="ziop_GroupTenMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupThreeMember" xlink:label="ziop_GroupThreeMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupThreeMember_lbl" xml:lang="en-US" id="id_123082_537108_3_1"> Group Three </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupThreeMember_lbl" xml:lang="en-US" id="id_123082_537108_1_1"> Group Three [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupThreeMember_lbl" xml:lang="en-US" id="id_123082_537108_2_1"> Upon enrollment of the first patient in a multi-center pivotal clinical trial </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupThreeMember" xlink:to="ziop_GroupThreeMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_GroupTwoMember" xlink:label="ziop_GroupTwoMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_GroupTwoMember_lbl" xml:lang="en-US" id="id_123082_537107_3_1"> Group Two </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_GroupTwoMember_lbl" xml:lang="en-US" id="id_123082_537107_1_1"> Group Two [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_GroupTwoMember_lbl" xml:lang="en-US" id="id_123082_537107_2_1"> Upon the completion of dosing of the last patient for both Phase 1 clinical trials </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_GroupTwoMember" xlink:to="ziop_GroupTwoMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_HarmonHillLlcMember" xlink:label="ziop_HarmonHillLlcMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_HarmonHillLlcMember_lbl" xml:lang="en-US" id="id_123082_603798_3_1"> Harmon Hill Ll </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_HarmonHillLlcMember_lbl" xml:lang="en-US" id="id_123082_603798_1_1"> Harmon Hill Llc [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_HarmonHillLlcMember_lbl" xml:lang="en-US" id="id_123082_603798_2_1"> Harmon Hill LLC </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_HarmonHillLlcMember" xlink:to="ziop_HarmonHillLlcMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US" id="id_123082_509240_1_1"> Income Statement [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US" id="id_123082_509240_2_1"> Income Statement [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:label="us-gaap_IncomeTaxesPaid"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxesPaid_lbl" xml:lang="en-US" id="id_123082_504360_1_1"> Income Taxes Paid </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncomeTaxesPaid_lbl" xml:lang="en-US" id="id_123082_504360_2_1"> Cash paid for income taxes </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxesPaid" xlink:to="us-gaap_IncomeTaxesPaid_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xml:lang="en-US" id="id_123082_499519_1_1"> Increase Decrease In Accounts Payable </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xml:lang="en-US" id="id_123082_499519_2_1"> Accounts payable </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayable" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xml:lang="en-US" id="id_123082_514845_1_1"> Increase Decrease In Accrued Liabilities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xml:lang="en-US" id="id_123082_514845_2_1"> Accrued expenses </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="us-gaap_IncreaseDecreaseInDeferredRevenue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInDeferredRevenue_lbl" xml:lang="en-US" id="id_123082_505013_1_1"> Increase Decrease In Deferred Revenue </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInDeferredRevenue_lbl" xml:lang="en-US" id="id_123082_505013_2_1"> Deferred revenue </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:to="us-gaap_IncreaseDecreaseInDeferredRevenue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:label="us-gaap_IncreaseDecreaseInDepositOtherAssets"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInDepositOtherAssets_lbl" xml:lang="en-US" id="id_123082_510730_1_1"> Increase Decrease In Deposit Other Assets </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_IncreaseDecreaseInDepositOtherAssets_lbl" xml:lang="en-US" id="id_123082_510730_8_1"> Deposits </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:to="us-gaap_IncreaseDecreaseInDepositOtherAssets_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingAssetsAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingAssetsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_lbl" xml:lang="en-US" id="id_123082_502369_1_1"> Increase Decrease In Operating Assets [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_lbl" xml:lang="en-US" id="id_123082_502369_2_1"> (Increase) decrease in: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingAssetsAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US" id="id_123082_503089_1_1"> Increase Decrease In Operating Capital [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US" id="id_123082_503089_2_1"> Change in operating assets and liabilities: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_lbl" xml:lang="en-US" id="id_123082_505259_1_1"> Increase Decrease In Operating Liabilities [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_lbl" xml:lang="en-US" id="id_123082_505259_2_1"> Increase (decrease) in: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOtherDeferredLiability" xlink:label="us-gaap_IncreaseDecreaseInOtherDeferredLiability"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOtherDeferredLiability_lbl" xml:lang="en-US" id="id_123082_505952_1_1"> Increase Decrease In Other Deferred Liability </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInOtherDeferredLiability_lbl" xml:lang="en-US" id="id_123082_505952_2_1"> Deferred rent </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherDeferredLiability" xlink:to="us-gaap_IncreaseDecreaseInOtherDeferredLiability_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_lbl" xml:lang="en-US" id="id_123082_511571_1_1"> Increase Decrease In Other Noncurrent Assets </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_lbl" xml:lang="en-US" id="id_123082_511571_8_1"> Other noncurrent assets </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" xlink:to="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xml:lang="en-US" id="id_123082_506727_1_1"> Increase Decrease In Prepaid Deferred Expense And Other Assets </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xml:lang="en-US" id="id_123082_506727_8_1"> Prepaid expenses and other current assets </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:to="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="us-gaap_IncreaseDecreaseInReceivables"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInReceivables_lbl" xml:lang="en-US" id="id_123082_513506_1_1"> Increase Decrease In Receivables </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_IncreaseDecreaseInReceivables_lbl" xml:lang="en-US" id="id_123082_513506_8_1"> Collaboration receivable </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInReceivables" xlink:to="us-gaap_IncreaseDecreaseInReceivables_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InstrumentAxis" xlink:label="us-gaap_InstrumentAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InstrumentAxis_lbl" xml:lang="en-US" id="id_123082_510508_1_1"> Instrument [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InstrumentAxis_lbl" xml:lang="en-US" id="id_123082_510508_2_1"> Instrument [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InstrumentAxis" xlink:to="us-gaap_InstrumentAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InstrumentTypeMember" xlink:label="us-gaap_InstrumentTypeMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InstrumentTypeMember_lbl" xml:lang="en-US" id="id_123082_503215_1_1"> Instrument Type [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InstrumentTypeMember_lbl" xml:lang="en-US" id="id_123082_503215_2_1"> Instrument Type [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InstrumentTypeMember" xlink:to="us-gaap_InstrumentTypeMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_IntellectualPropertyRightsMember" xlink:label="ziop_IntellectualPropertyRightsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_IntellectualPropertyRightsMember_lbl" xml:lang="en-US" id="id_123082_535922_3_1"> Intellectual Property Rights </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_IntellectualPropertyRightsMember_lbl" xml:lang="en-US" id="id_123082_535922_1_1"> Intellectual Property Rights [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_IntellectualPropertyRightsMember_lbl" xml:lang="en-US" id="id_123082_535922_2_1"> Intellectual Property Rights </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_IntellectualPropertyRightsMember" xlink:to="ziop_IntellectualPropertyRightsMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestPaid" xlink:label="us-gaap_InterestPaid"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestPaid_lbl" xml:lang="en-US" id="id_123082_512118_1_1"> Interest Paid </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestPaid_lbl" xml:lang="en-US" id="id_123082_512118_2_1"> Cash paid for interest </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPaid" xlink:to="us-gaap_InterestPaid_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_IntrexonCorporationMember" xlink:label="ziop_IntrexonCorporationMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_IntrexonCorporationMember_lbl" xml:lang="en-US" id="id_123082_603123_3_1"> Intrexon Corporation </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_IntrexonCorporationMember_lbl" xml:lang="en-US" id="id_123082_603123_1_1"> Intrexon Corporation [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_IntrexonCorporationMember_lbl" xml:lang="en-US" id="id_123082_603123_2_1"> Intrexon Corporation </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_IntrexonCorporationMember" xlink:to="ziop_IntrexonCorporationMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InventoriesMember" xlink:label="us-gaap_InventoriesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InventoriesMember_lbl" xml:lang="en-US" id="id_123082_511481_1_1"> Inventories [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InventoriesMember_lbl" xml:lang="en-US" id="id_123082_511481_2_1"> Inventories </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InventoriesMember" xlink:to="us-gaap_InventoriesMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_InvestmentOptionExercisePeriod" xlink:label="ziop_InvestmentOptionExercisePeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_InvestmentOptionExercisePeriod_lbl" xml:lang="en-US" id="id_123082_530148_3_1"> Investment Option, Exercise Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_InvestmentOptionExercisePeriod_lbl" xml:lang="en-US" id="id_123082_530148_1_1"> Investment Option Exercise Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_InvestmentOptionExercisePeriod_lbl" xml:lang="en-US" id="id_123082_530148_2_1"> Option exercise period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_InvestmentOptionExercisePeriod" xlink:to="ziop_InvestmentOptionExercisePeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd#invest_InvestmentWarrantsExpirationDate" xlink:label="invest_InvestmentWarrantsExpirationDate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="invest_InvestmentWarrantsExpirationDate_lbl" xml:lang="en-US" id="id_123082_497921_1_1"> Investment Warrants Expiration Date </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="invest_InvestmentWarrantsExpirationDate_lbl" xml:lang="en-US" id="id_123082_497921_2_1"> Warrants expiration date </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="invest_InvestmentWarrantsExpirationDate" xlink:to="invest_InvestmentWarrantsExpirationDate_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:label="us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims_lbl" xml:lang="en-US" id="id_123082_512854_1_1"> Issuance Of Stock And Warrants For Services Or Claims </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims_lbl" xml:lang="en-US" id="id_123082_512854_2_1"> Common stock issued in exchange for in-process research and development </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:to="us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_IssuanceOfWarrantsToPlacementAgentInPublicOffering" xlink:label="ziop_IssuanceOfWarrantsToPlacementAgentInPublicOffering"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_IssuanceOfWarrantsToPlacementAgentInPublicOffering_lbl" xml:lang="en-US" id="id_123082_521325_3_1"> Issuance Of Warrants To Placement Agent In Public Offering </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_IssuanceOfWarrantsToPlacementAgentInPublicOffering_lbl" xml:lang="en-US" id="id_123082_521325_1_1"> Issuance Of Warrants To Placement Agent In Public Offering </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_IssuanceOfWarrantsToPlacementAgentInPublicOffering_lbl" xml:lang="en-US" id="id_123082_521325_2_1"> Warrants issued to placement agents and investors </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_IssuanceOfWarrantsToPlacementAgentInPublicOffering" xlink:to="ziop_IssuanceOfWarrantsToPlacementAgentInPublicOffering_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_IssuanceOfWarrantsValue" xlink:label="ziop_IssuanceOfWarrantsValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_IssuanceOfWarrantsValue_lbl" xml:lang="en-US" id="id_123082_524643_3_1"> Issuance Of Warrants, Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_IssuanceOfWarrantsValue_lbl" xml:lang="en-US" id="id_123082_524643_1_1"> Issuance Of Warrants Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_IssuanceOfWarrantsValue_lbl" xml:lang="en-US" id="id_123082_524643_2_1"> Value of warrant issued </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_IssuanceOfWarrantsValue" xlink:to="ziop_IssuanceOfWarrantsValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LegalEntityAxis_lbl" xml:lang="en-US" id="id_123082_497730_1_1"> Legal Entity [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_LegalEntityAxis_lbl" xml:lang="en-US" id="id_123082_497730_2_1"> Legal Entity [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LegalEntityAxis" xlink:to="dei_LegalEntityAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US" id="id_123082_506022_1_1"> Liabilities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US" id="id_123082_506022_6_1"> Total liabilities </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US" id="id_123082_508780_1_1"> Liabilities And Stockholders Equity </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US" id="id_123082_508780_6_1"> Total liabilities and stockholders' equity </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_123082_501524_1_1"> Liabilities And Stockholders Equity [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_123082_501524_2_1"> LIABILITIES AND STOCKHOLDERS' EQUITY </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="us-gaap_LiabilitiesCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US" id="id_123082_511950_1_1"> Liabilities Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US" id="id_123082_511950_6_1"> Total current liabilities </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="us-gaap_LiabilitiesCurrentAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xml:lang="en-US" id="id_123082_510138_1_1"> Liabilities Current [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xml:lang="en-US" id="id_123082_510138_2_1"> Current liabilities: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_LiabilitiesMember" xlink:label="ziop_LiabilitiesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_LiabilitiesMember_lbl" xml:lang="en-US" id="id_123082_598178_3_1"> Liabilities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_LiabilitiesMember_lbl" xml:lang="en-US" id="id_123082_598178_1_1"> Liabilities [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_LiabilitiesMember_lbl" xml:lang="en-US" id="id_123082_598178_2_1"> Liabilities </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_LiabilitiesMember" xlink:to="ziop_LiabilitiesMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LicenseCosts" xlink:label="us-gaap_LicenseCosts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LicenseCosts_lbl" xml:lang="en-US" id="id_123082_511197_1_1"> License Costs </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LicenseCosts_lbl" xml:lang="en-US" id="id_123082_511197_2_1"> Licensing fee </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LicenseCosts" xlink:to="us-gaap_LicenseCosts_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingenciesByNatureOfContingencyAxis_lbl" xml:lang="en-US" id="id_123082_512812_1_1"> Loss Contingencies By Nature Of Contingency [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LossContingenciesByNatureOfContingencyAxis_lbl" xml:lang="en-US" id="id_123082_512812_2_1"> Loss Contingency Nature [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:to="us-gaap_LossContingenciesByNatureOfContingencyAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="us-gaap_LossContingencyNatureDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyNatureDomain_lbl" xml:lang="en-US" id="id_123082_514089_1_1"> Loss Contingency Nature [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LossContingencyNatureDomain_lbl" xml:lang="en-US" id="id_123082_514089_2_1"> Loss Contingency, Nature [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyNatureDomain" xlink:to="us-gaap_LossContingencyNatureDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MaximumMember_lbl" xml:lang="en-US" id="id_123082_514053_1_1"> Maximum [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MaximumMember_lbl" xml:lang="en-US" id="id_123082_514053_2_1"> Maximum </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MaximumMember" xlink:to="us-gaap_MaximumMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_MilestonePayment" xlink:label="ziop_MilestonePayment"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_MilestonePayment_lbl" xml:lang="en-US" id="id_123082_525784_3_1"> Milestone Payment </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_MilestonePayment_lbl" xml:lang="en-US" id="id_123082_525784_1_1"> Milestone Payment </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_MilestonePayment_lbl" xml:lang="en-US" id="id_123082_525784_2_1"> Milestone payment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_MilestonePayment" xlink:to="ziop_MilestonePayment_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_MilestonePaymentsMaximumAmount" xlink:label="ziop_MilestonePaymentsMaximumAmount"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_MilestonePaymentsMaximumAmount_lbl" xml:lang="en-US" id="id_123082_523118_3_1"> Milestone Payments, Maximum Amount </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_MilestonePaymentsMaximumAmount_lbl" xml:lang="en-US" id="id_123082_523118_1_1"> Milestone Payments Maximum Amount </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_MilestonePaymentsMaximumAmount_lbl" xml:lang="en-US" id="id_123082_523118_2_1"> Milestone maximum payment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_MilestonePaymentsMaximumAmount" xlink:to="ziop_MilestonePaymentsMaximumAmount_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MinimumMember_lbl" xml:lang="en-US" id="id_123082_513639_1_1"> Minimum [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MinimumMember_lbl" xml:lang="en-US" id="id_123082_513639_2_1"> Minimum </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MinimumMember" xlink:to="us-gaap_MinimumMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_MonteCarloOptionPricingModelMember" xlink:label="ziop_MonteCarloOptionPricingModelMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_MonteCarloOptionPricingModelMember_lbl" xml:lang="en-US" id="id_123082_580425_3_1"> Monte Carlo Option Pricing Model </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_MonteCarloOptionPricingModelMember_lbl" xml:lang="en-US" id="id_123082_580425_1_1"> Monte Carlo Option Pricing Model [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_MonteCarloOptionPricingModelMember_lbl" xml:lang="en-US" id="id_123082_580425_2_1"> Monte Carlo Option Pricing Model </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_MonteCarloOptionPricingModelMember" xlink:to="ziop_MonteCarloOptionPricingModelMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_MonthlyPaymentMember" xlink:label="ziop_MonthlyPaymentMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_MonthlyPaymentMember_lbl" xml:lang="en-US" id="id_123082_533711_3_1"> Monthly Payment </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_MonthlyPaymentMember_lbl" xml:lang="en-US" id="id_123082_533711_1_1"> Monthly Payment [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_MonthlyPaymentMember_lbl" xml:lang="en-US" id="id_123082_533711_2_1"> Monthly Payment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_MonthlyPaymentMember" xlink:to="ziop_MonthlyPaymentMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_NatureOfBusinessLineItems" xlink:label="ziop_NatureOfBusinessLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_NatureOfBusinessLineItems_lbl" xml:lang="en-US" id="id_123082_565492_3_1"> Nature Of Business [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_NatureOfBusinessLineItems_lbl" xml:lang="en-US" id="id_123082_565492_1_1"> Nature Of Business [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_NatureOfBusinessLineItems_lbl" xml:lang="en-US" id="id_123082_565492_2_1"> Nature Of Business [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_NatureOfBusinessLineItems" xlink:to="ziop_NatureOfBusinessLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_NatureOfBusinessTable" xlink:label="ziop_NatureOfBusinessTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_NatureOfBusinessTable_lbl" xml:lang="en-US" id="id_123082_572119_3_1"> Nature Of Business [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_NatureOfBusinessTable_lbl" xml:lang="en-US" id="id_123082_572119_1_1"> Nature Of Business [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_NatureOfBusinessTable_lbl" xml:lang="en-US" id="id_123082_572119_2_1"> Nature Of Business [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_NatureOfBusinessTable" xlink:to="ziop_NatureOfBusinessTable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xml:lang="en-US" id="id_123082_508099_1_1"> Net Cash Provided By Used In Financing Activities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xml:lang="en-US" id="id_123082_508099_6_1"> Net cash provided by financing activities </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_503174_1_1"> Net Cash Provided By Used In Financing Activities [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_503174_2_1"> Cash flows from financing activities: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US" id="id_123082_504277_1_1"> Net Cash Provided By Used In Investing Activities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US" id="id_123082_504277_6_1"> Net cash used in investing activities </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_501589_1_1"> Net Cash Provided By Used In Investing Activities [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_501589_2_1"> Cash flows from investing activities: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US" id="id_123082_504077_1_1"> Net Cash Provided By Used In Operating Activities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US" id="id_123082_504077_6_1"> Net cash used in operating activities </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_505595_1_1"> Net Cash Provided By Used In Operating Activities [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" id="id_123082_505595_2_1"> Cash flows from operating activities: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" id="id_123082_513055_1_1"> Net Income Loss </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" id="id_123082_513055_2_1"> Net loss </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" id="id_123082_513055_6_1"> Net income (loss) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_NonCashMember" xlink:label="ziop_NonCashMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_NonCashMember_lbl" xml:lang="en-US" id="id_123082_534240_3_1"> Non Cash </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_NonCashMember_lbl" xml:lang="en-US" id="id_123082_534240_1_1"> Non Cash [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_NonCashMember_lbl" xml:lang="en-US" id="id_123082_534240_2_1"> Cashless exercises </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_NonCashMember" xlink:to="ziop_NonCashMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_NonVestedRestrictedStockMember" xlink:label="ziop_NonVestedRestrictedStockMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_NonVestedRestrictedStockMember_lbl" xml:lang="en-US" id="id_123082_557649_3_1"> Non Vested Restricted Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_NonVestedRestrictedStockMember_lbl" xml:lang="en-US" id="id_123082_557649_1_1"> Non Vested Restricted Stock [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_NonVestedRestrictedStockMember_lbl" xml:lang="en-US" id="id_123082_557649_2_1"> Unvested restricted common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_NonVestedRestrictedStockMember" xlink:to="ziop_NonVestedRestrictedStockMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_NumberOfProducts" xlink:label="ziop_NumberOfProducts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_NumberOfProducts_lbl" xml:lang="en-US" id="id_123082_546182_3_1"> Number of Products </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_NumberOfProducts_lbl" xml:lang="en-US" id="id_123082_546182_1_1"> Number Of Products </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_NumberOfProducts_lbl" xml:lang="en-US" id="id_123082_546182_2_1"> Number of products </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_NumberOfProducts" xlink:to="ziop_NumberOfProducts_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingCostsAndExpenses" xlink:label="us-gaap_OperatingCostsAndExpenses"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingCostsAndExpenses_lbl" xml:lang="en-US" id="id_123082_501481_1_1"> Operating Costs And Expenses </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingCostsAndExpenses_lbl" xml:lang="en-US" id="id_123082_501481_6_1"> Total operating expenses </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingCostsAndExpenses" xlink:to="us-gaap_OperatingCostsAndExpenses_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingCostsAndExpensesAbstract" xlink:label="us-gaap_OperatingCostsAndExpensesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingCostsAndExpensesAbstract_lbl" xml:lang="en-US" id="id_123082_506807_1_1"> Operating Costs And Expenses [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OperatingCostsAndExpensesAbstract_lbl" xml:lang="en-US" id="id_123082_506807_2_1"> Operating expenses: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingCostsAndExpensesAbstract" xlink:to="us-gaap_OperatingCostsAndExpensesAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US" id="id_123082_509627_1_1"> Operating Expenses </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US" id="id_123082_509627_2_1"> Amounts paid for services incurred </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="us-gaap_OperatingIncomeLoss"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xml:lang="en-US" id="id_123082_498863_1_1"> Operating Income Loss </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xml:lang="en-US" id="id_123082_498863_6_1"> Loss from operations </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_OptionsToPurchaseCommonStock" xlink:label="ziop_OptionsToPurchaseCommonStock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_OptionsToPurchaseCommonStock_lbl" xml:lang="en-US" id="id_123082_567449_3_1"> Options To Purchase Common Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_OptionsToPurchaseCommonStock_lbl" xml:lang="en-US" id="id_123082_567449_1_1"> Options To Purchase Common Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_OptionsToPurchaseCommonStock_lbl" xml:lang="en-US" id="id_123082_567449_2_1"> Option to purchase common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_OptionsToPurchaseCommonStock" xlink:to="ziop_OptionsToPurchaseCommonStock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAdditionalCapital" xlink:label="us-gaap_OtherAdditionalCapital"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAdditionalCapital_lbl" xml:lang="en-US" id="id_123082_504527_1_1"> Other Additional Capital </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherAdditionalCapital_lbl" xml:lang="en-US" id="id_123082_504527_2_1"> Additional paid-in capital - warrants issued </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAdditionalCapital" xlink:to="us-gaap_OtherAdditionalCapital_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAdditionalCapitalMember" xlink:label="us-gaap_OtherAdditionalCapitalMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAdditionalCapitalMember_lbl" xml:lang="en-US" id="id_123082_504626_1_1"> Other Additional Capital [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherAdditionalCapitalMember_lbl" xml:lang="en-US" id="id_123082_504626_2_1"> Other Additional Capital </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAdditionalCapitalMember" xlink:to="us-gaap_OtherAdditionalCapitalMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="us-gaap_OtherAssetsNoncurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xml:lang="en-US" id="id_123082_500225_1_1"> Other Assets Noncurrent </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xml:lang="en-US" id="id_123082_500225_2_1"> Other non-current assets </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsNoncurrent" xlink:to="us-gaap_OtherAssetsNoncurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherExpenses" xlink:label="us-gaap_OtherExpenses"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherExpenses_lbl" xml:lang="en-US" id="id_123082_499331_1_1"> Other Expenses </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherExpenses_lbl" xml:lang="en-US" id="id_123082_499331_2_1"> Other expense </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherExpenses" xlink:to="us-gaap_OtherExpenses_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="us-gaap_OtherLiabilitiesNoncurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xml:lang="en-US" id="id_123082_506871_1_1"> Other Liabilities Noncurrent </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xml:lang="en-US" id="id_123082_506871_2_1"> Warrant liabilities </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherLiabilitiesNoncurrent" xlink:to="us-gaap_OtherLiabilitiesNoncurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="us-gaap_OtherNoncashIncomeExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherNoncashIncomeExpense_lbl" xml:lang="en-US" id="id_123082_498876_1_1"> Other Noncash Income Expense </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_OtherNoncashIncomeExpense_lbl" xml:lang="en-US" id="id_123082_498876_8_1"> Change in fair value of warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherNoncashIncomeExpense" xlink:to="us-gaap_OtherNoncashIncomeExpense_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherNonoperatingGainsLosses" xlink:label="us-gaap_OtherNonoperatingGainsLosses"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherNonoperatingGainsLosses_lbl" xml:lang="en-US" id="id_123082_500794_1_1"> Other Nonoperating Gains Losses </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherNonoperatingGainsLosses_lbl" xml:lang="en-US" id="id_123082_500794_2_1"> Change in fair value of warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherNonoperatingGainsLosses" xlink:to="us-gaap_OtherNonoperatingGainsLosses_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="us-gaap_OtherNonoperatingIncomeExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xml:lang="en-US" id="id_123082_500036_1_1"> Other Nonoperating Income Expense </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xml:lang="en-US" id="id_123082_500036_2_1"> Other income (expense) </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xml:lang="en-US" id="id_123082_500036_12_1"> Other income, net </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherNonoperatingIncomeExpense" xlink:to="us-gaap_OtherNonoperatingIncomeExpense_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US" id="id_123082_503189_1_1"> Payments For Repurchase Of Common Stock </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US" id="id_123082_503189_8_1"> Payments to employees for repurchase of common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsForRoyalties" xlink:label="us-gaap_PaymentsForRoyalties"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForRoyalties_lbl" xml:lang="en-US" id="id_123082_509449_1_1"> Payments For Royalties </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PaymentsForRoyalties_lbl" xml:lang="en-US" id="id_123082_509449_2_1"> Royalty payment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRoyalties" xlink:to="us-gaap_PaymentsForRoyalties_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xml:lang="en-US" id="id_123082_505828_1_1"> Payments To Acquire Property Plant And Equipment </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xml:lang="en-US" id="id_123082_505828_8_1"> Purchases of property and equipment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PercentageOfNetProfit" xlink:label="ziop_PercentageOfNetProfit"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PercentageOfNetProfit_lbl" xml:lang="en-US" id="id_123082_603807_3_1"> Percentage of Net Profit </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PercentageOfNetProfit_lbl" xml:lang="en-US" id="id_123082_603807_1_1"> Percentage Of Net Profit </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PercentageOfNetProfit_lbl" xml:lang="en-US" id="id_123082_603807_2_1"> Percent of company net profit </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PercentageOfNetProfit" xlink:to="ziop_PercentageOfNetProfit_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PercentageOfRevenue" xlink:label="ziop_PercentageOfRevenue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PercentageOfRevenue_lbl" xml:lang="en-US" id="id_123082_595319_3_1"> Percentage Of Revenue </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PercentageOfRevenue_lbl" xml:lang="en-US" id="id_123082_595319_1_1"> Percentage Of Revenue </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PercentageOfRevenue_lbl" xml:lang="en-US" id="id_123082_595319_2_1"> Percentage of revenue agreed to pay which is obtained from sublicensor </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PercentageOfRevenue" xlink:to="ziop_PercentageOfRevenue_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PeriodTypeAxis" xlink:label="ziop_PeriodTypeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PeriodTypeAxis_lbl" xml:lang="en-US" id="id_123082_575210_3_1"> Period Type [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PeriodTypeAxis_lbl" xml:lang="en-US" id="id_123082_575210_1_1"> Period Type [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PeriodTypeAxis_lbl" xml:lang="en-US" id="id_123082_575210_2_1"> Period Type [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PeriodTypeAxis" xlink:to="ziop_PeriodTypeAxis_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PeriodTypeDomain" xlink:label="ziop_PeriodTypeDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PeriodTypeDomain_lbl" xml:lang="en-US" id="id_123082_577683_3_1"> Period Type [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PeriodTypeDomain_lbl" xml:lang="en-US" id="id_123082_577683_1_1"> Period Type [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PeriodTypeDomain_lbl" xml:lang="en-US" id="id_123082_577683_2_1"> Period Type [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PeriodTypeDomain" xlink:to="ziop_PeriodTypeDomain_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PharmaceuticalResearchAssociatesIncMember" xlink:label="ziop_PharmaceuticalResearchAssociatesIncMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PharmaceuticalResearchAssociatesIncMember_lbl" xml:lang="en-US" id="id_123082_603802_3_1"> Pharmaceutical Research Associates Inc </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PharmaceuticalResearchAssociatesIncMember_lbl" xml:lang="en-US" id="id_123082_603802_1_1"> Pharmaceutical Research Associates Inc [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PharmaceuticalResearchAssociatesIncMember_lbl" xml:lang="en-US" id="id_123082_603802_2_1"> Pharmaceutical Research Associates Inc </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PharmaceuticalResearchAssociatesIncMember" xlink:to="ziop_PharmaceuticalResearchAssociatesIncMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PhaseOneMember" xlink:label="ziop_PhaseOneMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PhaseOneMember_lbl" xml:lang="en-US" id="id_123082_516172_3_1"> Phase 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PhaseOneMember_lbl" xml:lang="en-US" id="id_123082_516172_1_1"> Phase One [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PhaseOneMember_lbl" xml:lang="en-US" id="id_123082_516172_2_1"> Upon the commencement of Phase 1 clinical trial </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PhaseOneMember" xlink:to="ziop_PhaseOneMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PhaseThreeMember" xlink:label="ziop_PhaseThreeMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PhaseThreeMember_lbl" xml:lang="en-US" id="id_123082_518024_3_1"> Phase 3 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PhaseThreeMember_lbl" xml:lang="en-US" id="id_123082_518024_1_1"> Phase Three [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PhaseThreeMember_lbl" xml:lang="en-US" id="id_123082_518024_2_1"> Phase 3 </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PhaseThreeMember" xlink:to="ziop_PhaseThreeMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PhaseTwoMember" xlink:label="ziop_PhaseTwoMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PhaseTwoMember_lbl" xml:lang="en-US" id="id_123082_516640_3_1"> Phase 2 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PhaseTwoMember_lbl" xml:lang="en-US" id="id_123082_516640_1_1"> Phase Two [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PhaseTwoMember_lbl" xml:lang="en-US" id="id_123082_516640_2_1"> Upon the dosing of the first patient </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PhaseTwoMember" xlink:to="ziop_PhaseTwoMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PPDDevelopmentLPMember" xlink:label="ziop_PPDDevelopmentLPMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PPDDevelopmentLPMember_lbl" xml:lang="en-US" id="id_123082_603799_3_1"> PPD Development L P </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PPDDevelopmentLPMember_lbl" xml:lang="en-US" id="id_123082_603799_1_1"> P P D Development L P [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PPDDevelopmentLPMember_lbl" xml:lang="en-US" id="id_123082_603799_2_1"> PPD Development L. P. </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PPDDevelopmentLPMember" xlink:to="ziop_PPDDevelopmentLPMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xml:lang="en-US" id="id_123082_508638_1_1"> Preferred Stock Par Or Stated Value Per Share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xml:lang="en-US" id="id_123082_508638_2_1"> Preferred stock, par value </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockParOrStatedValuePerShare" xlink:to="us-gaap_PreferredStockParOrStatedValuePerShare_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="us-gaap_PreferredStockSharesAuthorized"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xml:lang="en-US" id="id_123082_507083_1_1"> Preferred Stock Shares Authorized </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xml:lang="en-US" id="id_123082_507083_2_1"> Preferred stock, shares authorized </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="us-gaap_PreferredStockSharesIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xml:lang="en-US" id="id_123082_513613_1_1"> Preferred Stock Shares Issued </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xml:lang="en-US" id="id_123082_513613_2_1"> Preferred stock, shares issued </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesIssued" xlink:to="us-gaap_PreferredStockSharesIssued_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="us-gaap_PreferredStockSharesOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_513494_1_1"> Preferred Stock Shares Outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_513494_2_1"> Preferred stock, shares outstanding </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesOutstanding" xlink:to="us-gaap_PreferredStockSharesOutstanding_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="us-gaap_PreferredStockValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockValue_lbl" xml:lang="en-US" id="id_123082_513620_1_1"> Preferred Stock Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PreferredStockValue_lbl" xml:lang="en-US" id="id_123082_513620_2_1"> Preferred stock, $0.001 par value; 30,000,000 shares authorized and no shares issued and outstanding </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockValue" xlink:to="us-gaap_PreferredStockValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xml:lang="en-US" id="id_123082_497998_1_1"> Prepaid Expense And Other Assets Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xml:lang="en-US" id="id_123082_497998_2_1"> Prepaid expenses and other current assets </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xml:lang="en-US" id="id_123082_497998_12_1"> Remaining service expenses expected to be incurred </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:to="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrivatePlacementMember" xlink:label="us-gaap_PrivatePlacementMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PrivatePlacementMember_lbl" xml:lang="en-US" id="id_123082_505866_1_1"> Private Placement [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PrivatePlacementMember_lbl" xml:lang="en-US" id="id_123082_505866_2_1"> Private Placement </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PrivatePlacementMember" xlink:to="us-gaap_PrivatePlacementMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromContributedCapital" xlink:label="us-gaap_ProceedsFromContributedCapital"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromContributedCapital_lbl" xml:lang="en-US" id="id_123082_509695_1_1"> Proceeds From Contributed Capital </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromContributedCapital_lbl" xml:lang="en-US" id="id_123082_509695_2_1"> Stockholders' capital contribution </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromContributedCapital" xlink:to="us-gaap_ProceedsFromContributedCapital_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US" id="id_123082_499569_1_1"> Proceeds From Issuance Of Common Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US" id="id_123082_499569_2_1"> Proceed from sale of common stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US" id="id_123082_499569_12_1"> Proceeds from issuance of common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xlink:label="ziop_ProceedsFromIssuanceOfCommonStockAndWarrantsNet"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ProceedsFromIssuanceOfCommonStockAndWarrantsNet_lbl" xml:lang="en-US" id="id_123082_519679_3_1"> The cash inflow from the additional capital contribution to the entity including any warrants issued. Proceeds are net of cash outflows for issuance costs related to the transaction. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ProceedsFromIssuanceOfCommonStockAndWarrantsNet_lbl" xml:lang="en-US" id="id_123082_519679_1_1"> Proceeds From Issuance Of Common Stock And Warrants Net </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ProceedsFromIssuanceOfCommonStockAndWarrantsNet_lbl" xml:lang="en-US" id="id_123082_519679_2_1"> Proceeds from issuance of common stock and warrants, net </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xlink:to="ziop_ProceedsFromIssuanceOfCommonStockAndWarrantsNet_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:label="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_lbl" xml:lang="en-US" id="id_123082_514439_1_1"> Proceeds From Issuance Of Preferred Stock And Preference Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_lbl" xml:lang="en-US" id="id_123082_514439_2_1"> Proceeds from issuance of preferred stock, net </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:to="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromLicenseFeesReceived" xlink:label="us-gaap_ProceedsFromLicenseFeesReceived"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromLicenseFeesReceived_lbl" xml:lang="en-US" id="id_123082_506363_1_1"> Proceeds From License Fees Received </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromLicenseFeesReceived_lbl" xml:lang="en-US" id="id_123082_506363_2_1"> Upfront payment received </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromLicenseFeesReceived" xlink:to="us-gaap_ProceedsFromLicenseFeesReceived_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xml:lang="en-US" id="id_123082_502218_1_1"> Proceeds From Sale Of Property Plant And Equipment </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xml:lang="en-US" id="id_123082_502218_2_1"> Proceeds from sale of property and equipment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:to="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="us-gaap_ProceedsFromStockOptionsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xml:lang="en-US" id="id_123082_503911_1_1"> Proceeds From Stock Options Exercised </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xml:lang="en-US" id="id_123082_503911_2_1"> Proceeds from exercise of stock options </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromStockOptionsExercised" xlink:to="us-gaap_ProceedsFromStockOptionsExercised_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromWarrantExercises" xlink:label="us-gaap_ProceedsFromWarrantExercises"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromWarrantExercises_lbl" xml:lang="en-US" id="id_123082_507569_1_1"> Proceeds From Warrant Exercises </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromWarrantExercises_lbl" xml:lang="en-US" id="id_123082_507569_2_1"> Cash Received </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ProceedsFromWarrantExercises_lbl" xml:lang="en-US" id="id_123082_507569_12_1"> Proceeds from exercise of warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromWarrantExercises" xlink:to="us-gaap_ProceedsFromWarrantExercises_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xml:lang="en-US" id="id_123082_514011_1_1"> Property Plant And Equipment Net </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xml:lang="en-US" id="id_123082_514011_2_1"> Property and equipment, net </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentNet" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PublicOfferingMember" xlink:label="ziop_PublicOfferingMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PublicOfferingMember_lbl" xml:lang="en-US" id="id_123082_531939_3_1"> Public Offering </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PublicOfferingMember_lbl" xml:lang="en-US" id="id_123082_531939_1_1"> Public Offering [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PublicOfferingMember_lbl" xml:lang="en-US" id="id_123082_531939_2_1"> Registered direct offering </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PublicOfferingMember" xlink:to="ziop_PublicOfferingMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_PublicOfferingNetPricePerShare" xlink:label="ziop_PublicOfferingNetPricePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_PublicOfferingNetPricePerShare_lbl" xml:lang="en-US" id="id_123082_539789_3_1"> Public offering, net price per share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_PublicOfferingNetPricePerShare_lbl" xml:lang="en-US" id="id_123082_539789_1_1"> Public Offering Net Price Per Share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_PublicOfferingNetPricePerShare_lbl" xml:lang="en-US" id="id_123082_539789_2_1"> Issuance & sale of common stock in Public offering price per share </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_PublicOfferingNetPricePerShare" xlink:to="ziop_PublicOfferingNetPricePerShare_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_QuarterlyPaymentMember" xlink:label="ziop_QuarterlyPaymentMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_QuarterlyPaymentMember_lbl" xml:lang="en-US" id="id_123082_533712_3_1"> Quarterly Payment </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_QuarterlyPaymentMember_lbl" xml:lang="en-US" id="id_123082_533712_1_1"> Quarterly Payment [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_QuarterlyPaymentMember_lbl" xml:lang="en-US" id="id_123082_533712_2_1"> Quarterly Payment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_QuarterlyPaymentMember" xlink:to="ziop_QuarterlyPaymentMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RangeAxis_lbl" xml:lang="en-US" id="id_123082_504957_1_1"> Range [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RangeAxis_lbl" xml:lang="en-US" id="id_123082_504957_2_1"> Range [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RangeMember_lbl" xml:lang="en-US" id="id_123082_498452_1_1"> Range [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RangeMember_lbl" xml:lang="en-US" id="id_123082_498452_2_1"> Range [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_RangeMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="us-gaap_ReceivablesNetCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ReceivablesNetCurrent_lbl" xml:lang="en-US" id="id_123082_505722_1_1"> Receivables Net Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ReceivablesNetCurrent_lbl" xml:lang="en-US" id="id_123082_505722_2_1"> Collaboration receivable </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ReceivablesNetCurrent" xlink:to="us-gaap_ReceivablesNetCurrent_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ReclassificationOfWarrantLiabilitiesToEquity" xlink:label="ziop_ReclassificationOfWarrantLiabilitiesToEquity"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ReclassificationOfWarrantLiabilitiesToEquity_lbl" xml:lang="en-US" id="id_123082_526241_3_1"> Reclassification Of Warrant Liabilities To Equity </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ReclassificationOfWarrantLiabilitiesToEquity_lbl" xml:lang="en-US" id="id_123082_526241_1_1"> Reclassification Of Warrant Liabilities To Equity </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ReclassificationOfWarrantLiabilitiesToEquity_lbl" xml:lang="en-US" id="id_123082_526241_2_1"> Liability Reclassed to Equity </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ReclassificationOfWarrantLiabilitiesToEquity" xlink:to="ziop_ReclassificationOfWarrantLiabilitiesToEquity_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyDomain_lbl" xml:lang="en-US" id="id_123082_499013_1_1"> Related Party [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RelatedPartyDomain_lbl" xml:lang="en-US" id="id_123082_499013_2_1"> Related Party [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="us-gaap_RelatedPartyDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="us-gaap_RelatedPartyTransactionLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xml:lang="en-US" id="id_123082_510354_1_1"> Related Party Transaction [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xml:lang="en-US" id="id_123082_510354_2_1"> Related Party Transaction [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_RelatedPartyTransactionLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xml:lang="en-US" id="id_123082_507611_1_1"> Related Party Transactions By Related Party [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xml:lang="en-US" id="id_123082_507611_2_1"> Related Party [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_503417_1_1"> Related Party Transactions Disclosure [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_503417_2_1"> Related Party Transactions </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:to="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_RequirementOfEligibleFutureMilestonePaymentsAxis" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsAxis_lbl" xml:lang="en-US" id="id_123082_588157_3_1"> Requirement Of Eligible Future Milestone Payments [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsAxis_lbl" xml:lang="en-US" id="id_123082_588157_1_1"> Requirement Of Eligible Future Milestone Payments [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsAxis_lbl" xml:lang="en-US" id="id_123082_588157_2_1"> Requirement Of Eligible Future Milestone Payments [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_RequirementOfEligibleFutureMilestonePaymentsAxis" xlink:to="ziop_RequirementOfEligibleFutureMilestonePaymentsAxis_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_RequirementOfEligibleFutureMilestonePaymentsDomain" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsDomain_lbl" xml:lang="en-US" id="id_123082_588031_3_1"> Requirement Of Eligible Future Milestone Payments [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsDomain_lbl" xml:lang="en-US" id="id_123082_588031_1_1"> Requirement Of Eligible Future Milestone Payments [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_RequirementOfEligibleFutureMilestonePaymentsDomain_lbl" xml:lang="en-US" id="id_123082_588031_2_1"> Requirement Of Eligible Future Milestone Payments [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_RequirementOfEligibleFutureMilestonePaymentsDomain" xlink:to="ziop_RequirementOfEligibleFutureMilestonePaymentsDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis_lbl" xml:lang="en-US" id="id_123082_501050_1_1"> Research And Development Arrangement Contract To Perform For Others By Type [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis_lbl" xml:lang="en-US" id="id_123082_501050_2_1"> Research and Development Arrangement, Contract to Perform for Others, Type [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis" xlink:to="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain_lbl" xml:lang="en-US" id="id_123082_499364_1_1"> Research And Development Arrangement Contract To Perform For Others Type [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain_lbl" xml:lang="en-US" id="id_123082_499364_2_1"> Research and Development Arrangement, Contract to Perform for Others, Type [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain" xlink:to="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="us-gaap_ResearchAndDevelopmentExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xml:lang="en-US" id="id_123082_507943_1_1"> Research And Development Expense </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xml:lang="en-US" id="id_123082_507943_2_1"> Research and development, including costs of research contracts </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xml:lang="en-US" id="id_123082_507943_12_1"> Research expenses </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentExpense" xlink:to="us-gaap_ResearchAndDevelopmentExpense_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xml:lang="en-US" id="id_123082_506779_1_1"> Research And Development Expense [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xml:lang="en-US" id="id_123082_506779_2_1"> Research and Development Expense </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentExpenseMember" xlink:to="us-gaap_ResearchAndDevelopmentExpenseMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="us-gaap_RestructuringCharges"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestructuringCharges_lbl" xml:lang="en-US" id="id_123082_506397_1_1"> Restructuring Charges </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RestructuringCharges_lbl" xml:lang="en-US" id="id_123082_506397_2_1"> Restructuring charge </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestructuringCharges" xlink:to="us-gaap_RestructuringCharges_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="us-gaap_RestructuringCostAndReserveAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestructuringCostAndReserveAxis_lbl" xml:lang="en-US" id="id_123082_510660_1_1"> Restructuring Cost And Reserve [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RestructuringCostAndReserveAxis_lbl" xml:lang="en-US" id="id_123082_510660_2_1"> Restructuring Type [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestructuringCostAndReserveAxis" xlink:to="us-gaap_RestructuringCostAndReserveAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US" id="id_123082_507557_1_1"> Retained Earnings Accumulated Deficit </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US" id="id_123082_507557_2_1"> Accumulated deficit </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_RoyaltyPaymentsMember" xlink:label="ziop_RoyaltyPaymentsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_RoyaltyPaymentsMember_lbl" xml:lang="en-US" id="id_123082_533554_3_1"> Royalty Payments </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_RoyaltyPaymentsMember_lbl" xml:lang="en-US" id="id_123082_533554_1_1"> Royalty Payments [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_RoyaltyPaymentsMember_lbl" xml:lang="en-US" id="id_123082_533554_2_1"> Royalty Payments </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_RoyaltyPaymentsMember" xlink:to="ziop_RoyaltyPaymentsMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_SaleOfStockAxis" xlink:label="ziop_SaleOfStockAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_SaleOfStockAxis_lbl" xml:lang="en-US" id="id_123082_547800_3_1"> Sale Of Stock [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_SaleOfStockAxis_lbl" xml:lang="en-US" id="id_123082_547800_1_1"> Sale Of Stock [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_SaleOfStockAxis_lbl" xml:lang="en-US" id="id_123082_547800_2_1"> Sale Of Stock [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_SaleOfStockAxis" xlink:to="ziop_SaleOfStockAxis_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_SaleOfStockDomain" xlink:label="ziop_SaleOfStockDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_SaleOfStockDomain_lbl" xml:lang="en-US" id="id_123082_548248_3_1"> Sale Of Stock [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_SaleOfStockDomain_lbl" xml:lang="en-US" id="id_123082_548248_1_1"> Sale Of Stock [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_SaleOfStockDomain_lbl" xml:lang="en-US" id="id_123082_548248_2_1"> Sale Of Stock [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_SaleOfStockDomain" xlink:to="ziop_SaleOfStockDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xml:lang="en-US" id="id_123082_508961_1_1"> Sale Of Stock Name Of Transaction [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xml:lang="en-US" id="id_123082_508961_2_1"> Sale of Stock, Name of Transaction [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="us-gaap_SaleOfStockPricePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xml:lang="en-US" id="id_123082_514577_1_1"> Sale Of Stock Price Per Share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xml:lang="en-US" id="id_123082_514577_2_1"> Sale of stock ,price per share </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xml:lang="en-US" id="id_123082_514577_12_1"> sale of stock Price per share </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SaleOfStockPricePerShare" xlink:to="us-gaap_SaleOfStockPricePerShare_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_SalesEventsMilestoneMember" xlink:label="ziop_SalesEventsMilestoneMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_SalesEventsMilestoneMember_lbl" xml:lang="en-US" id="id_123082_535137_3_1"> Sales Events Milestone </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_SalesEventsMilestoneMember_lbl" xml:lang="en-US" id="id_123082_535137_1_1"> Sales Events Milestone [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_SalesEventsMilestoneMember_lbl" xml:lang="en-US" id="id_123082_535137_2_1"> Sales-based milestones </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_SalesEventsMilestoneMember" xlink:to="ziop_SalesEventsMilestoneMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="us-gaap_ScenarioUnspecifiedDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScenarioUnspecifiedDomain_lbl" xml:lang="en-US" id="id_123082_505562_1_1"> Scenario Unspecified [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScenarioUnspecifiedDomain_lbl" xml:lang="en-US" id="id_123082_505562_2_1"> Scenario, Unspecified [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScenarioUnspecifiedDomain" xlink:to="us-gaap_ScenarioUnspecifiedDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xml:lang="en-US" id="id_123082_514668_1_1"> Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xml:lang="en-US" id="id_123082_514668_2_1"> Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:to="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xml:lang="en-US" id="id_123082_508745_1_1"> Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xml:lang="en-US" id="id_123082_508745_2_1"> Potential Dilutive Shares Excluded from Computation of Diluted Net Loss Per Share </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:to="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_lbl" xml:lang="en-US" id="id_123082_498752_1_1"> Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs By Report Line [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_lbl" xml:lang="en-US" id="id_123082_498752_2_1"> Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis" xlink:to="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xml:lang="en-US" id="id_123082_509193_1_1"> Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xml:lang="en-US" id="id_123082_509193_2_1"> Assets and Liabilities Measured at Fair Value on Recurring Basis </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:to="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock" xlink:label="us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock_lbl" xml:lang="en-US" id="id_123082_504263_1_1"> Schedule Of Nonvested Share Activity Table [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock_lbl" xml:lang="en-US" id="id_123082_504263_2_1"> Summary of Unvested Restricted Stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock" xlink:to="us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl" xml:lang="en-US" id="id_123082_508685_1_1"> Schedule Of Related Party Transactions By Related Party [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl" xml:lang="en-US" id="id_123082_508685_2_1"> Schedule of Related Party Transactions, by Related Party [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ScheduleOfResearchAndDevelopmentLineItems" xlink:label="ziop_ScheduleOfResearchAndDevelopmentLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ScheduleOfResearchAndDevelopmentLineItems_lbl" xml:lang="en-US" id="id_123082_518869_3_1"> Schedule Of Research And Development [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ScheduleOfResearchAndDevelopmentLineItems_lbl" xml:lang="en-US" id="id_123082_518869_1_1"> Schedule Of Research And Development [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ScheduleOfResearchAndDevelopmentLineItems_lbl" xml:lang="en-US" id="id_123082_518869_2_1"> Schedule Of Research And Development [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ScheduleOfResearchAndDevelopmentLineItems" xlink:to="ziop_ScheduleOfResearchAndDevelopmentLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ScheduleOfResearchAndDevelopmentTable" xlink:label="ziop_ScheduleOfResearchAndDevelopmentTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ScheduleOfResearchAndDevelopmentTable_lbl" xml:lang="en-US" id="id_123082_542026_3_1"> Schedule Of Research And Development [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ScheduleOfResearchAndDevelopmentTable_lbl" xml:lang="en-US" id="id_123082_542026_1_1"> Schedule Of Research And Development [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ScheduleOfResearchAndDevelopmentTable_lbl" xml:lang="en-US" id="id_123082_542026_2_1"> Schedule Of Research And Development [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ScheduleOfResearchAndDevelopmentTable" xlink:to="ziop_ScheduleOfResearchAndDevelopmentTable_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ScheduleOfSecuritiesValuationAssumptionsTableTextBlock" xlink:label="ziop_ScheduleOfSecuritiesValuationAssumptionsTableTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ScheduleOfSecuritiesValuationAssumptionsTableTextBlock_lbl" xml:lang="en-US" id="id_123082_539170_3_1"> Schedule of Securities Valuation Assumptions </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ScheduleOfSecuritiesValuationAssumptionsTableTextBlock_lbl" xml:lang="en-US" id="id_123082_539170_1_1"> Schedule Of Securities Valuation Assumptions Table [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ScheduleOfSecuritiesValuationAssumptionsTableTextBlock_lbl" xml:lang="en-US" id="id_123082_539170_2_1"> Assumptions Used In Binomial Valuation Model and Black-Scholes Valuation Model </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ScheduleOfSecuritiesValuationAssumptionsTableTextBlock" xlink:to="ziop_ScheduleOfSecuritiesValuationAssumptionsTableTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xml:lang="en-US" id="id_123082_504588_1_1"> Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xml:lang="en-US" id="id_123082_504588_2_1"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xml:lang="en-US" id="id_123082_507270_1_1"> Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xml:lang="en-US" id="id_123082_507270_2_1"> Stock Option Activity Under Stock Option Plan </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="us-gaap_ScheduleOfStockByClassTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfStockByClassTable_lbl" xml:lang="en-US" id="id_123082_510939_1_1"> Schedule Of Stock By Class [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfStockByClassTable_lbl" xml:lang="en-US" id="id_123082_510939_2_1"> Schedule of Stock by Class [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfStockByClassTable" xlink:to="us-gaap_ScheduleOfStockByClassTable_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ScheduleOfStockholdersEquityNoteWarrantsAndCommonStockActivityTableTextBlock" xlink:label="ziop_ScheduleOfStockholdersEquityNoteWarrantsAndCommonStockActivityTableTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ScheduleOfStockholdersEquityNoteWarrantsAndCommonStockActivityTableTextBlock_lbl" xml:lang="en-US" id="id_123082_539062_3_1"> Schedule of Stockholders' Equity Note, Warrants and Common Stock Activity </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ScheduleOfStockholdersEquityNoteWarrantsAndCommonStockActivityTableTextBlock_lbl" xml:lang="en-US" id="id_123082_539062_1_1"> Schedule Of Stockholders Equity Note Warrants And Common Stock Activity Table [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ScheduleOfStockholdersEquityNoteWarrantsAndCommonStockActivityTableTextBlock_lbl" xml:lang="en-US" id="id_123082_539062_2_1"> Warrant Exercises </label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock" xlink:label="us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_lbl" xml:lang="en-US" id="id_123082_509142_1_1"> Schedule Of Stockholders Equity Note Warrants Or Rights [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_lbl" xml:lang="en-US" id="id_123082_509142_2_1"> Number of Warrants Outstanding </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock" xlink:to="us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US" id="id_123082_501410_1_1"> Share Based Compensation </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US" id="id_123082_501410_2_1"> Stock based compensation expenses </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US" id="id_123082_501410_12_1"> Stock-based compensation </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xml:lang="en-US" id="id_123082_514454_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xml:lang="en-US" id="id_123082_514454_8_1"> Cancelled </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_509892_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_509892_2_1"> Cancelled </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_123082_500719_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_123082_500719_2_1"> Granted </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_507062_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_507062_2_1"> Granted </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xml:lang="en-US" id="id_123082_510998_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xml:lang="en-US" id="id_123082_510998_4_1"> Ending Balance </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xml:lang="en-US" id="id_123082_510998_5_1"> Beginning Balance </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_lbl" xml:lang="en-US" id="id_123082_507412_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_lbl" xml:lang="en-US" id="id_123082_507412_2_1"> Number of Shares </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_506728_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_506728_4_1"> Ending Balance </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_506728_5_1"> Beginning Balance </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_lbl" xml:lang="en-US" id="id_123082_510434_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_lbl" xml:lang="en-US" id="id_123082_510434_2_1"> Weighted Average Grant Date Fair Value </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xml:lang="en-US" id="id_123082_505115_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xml:lang="en-US" id="id_123082_505115_8_1"> Vested </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_506530_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_506530_2_1"> Vested </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xml:lang="en-US" id="id_123082_500887_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xml:lang="en-US" id="id_123082_500887_2_1"> Expected dividend yield </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xml:lang="en-US" id="id_123082_503810_1_1"> Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xml:lang="en-US" id="id_123082_503810_2_1"> Expected life in years </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_lbl" xml:lang="en-US" id="id_123082_508979_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_lbl" xml:lang="en-US" id="id_123082_508979_2_1"> Expected volatility </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_lbl" xml:lang="en-US" id="id_123082_506055_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_lbl" xml:lang="en-US" id="id_123082_506055_2_1"> Expected volatility </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedLineItems" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedLineItems_lbl" xml:lang="en-US" id="id_123082_518745_3_1"> Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedLineItems_lbl" xml:lang="en-US" id="id_123082_518745_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedLineItems_lbl" xml:lang="en-US" id="id_123082_518745_2_1"> Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedLineItems" xlink:to="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTable" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTable_lbl" xml:lang="en-US" id="id_123082_541707_3_1"> Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTable_lbl" xml:lang="en-US" id="id_123082_541707_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTable_lbl" xml:lang="en-US" id="id_123082_541707_2_1"> Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Table] </label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTableTextBlock_lbl" xml:lang="en-US" id="id_123082_538865_3_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTableTextBlock_lbl" xml:lang="en-US" id="id_123082_538865_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used Table [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTableTextBlock_lbl" xml:lang="en-US" id="id_123082_538865_2_1"> Fair Value of Stock Options Assumptions Using Black-Scholes Option Valuation Model </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTableTextBlock" xlink:to="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsedTableTextBlock_lbl"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_lbl" xml:lang="en-US" id="id_123082_512573_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_lbl" xml:lang="en-US" id="id_123082_512573_2_1"> Risk-free interest rate </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_lbl" xml:lang="en-US" id="id_123082_501351_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_lbl" xml:lang="en-US" id="id_123082_501351_2_1"> Risk-free interest rate </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xml:lang="en-US" id="id_123082_506515_1_1"> Share Based Compensation Arrangement By Share Based Payment Award [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xml:lang="en-US" id="id_123082_506515_2_1"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xml:lang="en-US" id="id_123082_498929_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xml:lang="en-US" id="id_123082_498929_2_1"> Options available for future grant </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_lbl" xml:lang="en-US" id="id_123082_518608_3_1"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_lbl" xml:lang="en-US" id="id_123082_518608_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] </label>
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<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract" xlink:to="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xml:lang="en-US" id="id_123082_502200_1_1"> Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xml:lang="en-US" id="id_123082_502200_4_1"> Options exercisable, at end of period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xml:lang="en-US" id="id_123082_502200_5_1"> Options exercisable, at beginning of period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xml:lang="en-US" id="id_123082_500657_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xml:lang="en-US" id="id_123082_500657_4_1"> Options exercisable, at end of period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xml:lang="en-US" id="id_123082_500657_5_1"> Options exercisable, at beginning of period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_503873_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_503873_4_1"> Options exercisable, at end of period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_503873_5_1"> Options exercisable, at beginning of period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US" id="id_123082_499749_1_1"> Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US" id="id_123082_499749_2_1"> Options exercisable </label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xml:lang="en-US" id="id_123082_498817_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xml:lang="en-US" id="id_123082_498817_2_1"> Outstanding, at end of period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestNumber" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestNumber"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestNumber_lbl" xml:lang="en-US" id="id_123082_528961_3_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Expected to Vest Number </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestNumber_lbl" xml:lang="en-US" id="id_123082_528961_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Number </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestNumber_lbl" xml:lang="en-US" id="id_123082_528961_2_1"> Shares expected to vest </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestNumber" xlink:to="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestNumber_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xml:lang="en-US" id="id_123082_508840_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xml:lang="en-US" id="id_123082_508840_8_1"> Cancelled </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_123082_513542_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_123082_513542_32_1"> Stock options , granted </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_123082_513542_2_1"> Granted </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_123082_513542_12_1"> Shares of common stock granted </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_514885_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US" id="id_123082_514885_2_1"> Weighted-average grant date fair value </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US" id="id_123082_512372_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US" id="id_123082_512372_4_1"> Ending Balance </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US" id="id_123082_512372_5_1"> Beginning Balance </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl" xml:lang="en-US" id="id_123082_501064_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl" xml:lang="en-US" id="id_123082_501064_2_1"> Number of Shares </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_507672_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_507672_4_1"> Ending Balance </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_507672_5_1"> Beginning Balance </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xml:lang="en-US" id="id_123082_510985_1_1"> Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term 2 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xml:lang="en-US" id="id_123082_510985_2_1"> Outstanding, at end of period (in years) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested_lbl" xml:lang="en-US" id="id_123082_578605_3_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Vested </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested_lbl" xml:lang="en-US" id="id_123082_578605_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Vested </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested_lbl" xml:lang="en-US" id="id_123082_578605_2_1"> Shares vested </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested" xlink:to="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_lbl" xml:lang="en-US" id="id_123082_508857_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_lbl" xml:lang="en-US" id="id_123082_508857_2_1"> Vested and unvested expected to vest at end of period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_lbl" xml:lang="en-US" id="id_123082_505055_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_lbl" xml:lang="en-US" id="id_123082_505055_2_1"> Vested and unvested expected to vest at end of period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_507959_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_507959_2_1"> Vested and unvested expected to vest at end of period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US" id="id_123082_501100_1_1"> Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term 1 </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US" id="id_123082_501100_2_1"> Vested and unvested expected to vest at end of period (in years) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract_lbl" xml:lang="en-US" id="id_123082_518606_3_1"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract_lbl" xml:lang="en-US" id="id_123082_518606_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Exercise Price [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract_lbl" xml:lang="en-US" id="id_123082_518606_2_1"> Weighted Average Exercise Price </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" xlink:to="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_lbl" xml:lang="en-US" id="id_123082_518607_3_1"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_lbl" xml:lang="en-US" id="id_123082_518607_1_1"> Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_lbl" xml:lang="en-US" id="id_123082_518607_2_1"> Weighted Average Contractual Term (in years) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" xlink:to="ziop_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_lbl" xml:lang="en-US" id="id_123082_499605_1_1"> Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_lbl" xml:lang="en-US" id="id_123082_499605_2_1"> Award Type [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_505372_1_1"> Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_505372_2_1"> Exercised </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_501696_1_1"> Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_501696_2_1"> Cancelled </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_501417_1_1"> Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_123082_501417_2_1"> Granted </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="us-gaap_SharesOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US" id="id_123082_507421_1_1"> Shares Outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US" id="id_123082_507421_4_1"> Ending Balance (in shares) </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US" id="id_123082_507421_5_1"> Beginning Balance (in shares) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xml:lang="en-US" id="id_123082_513804_1_1"> Significant Accounting Policies [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xml:lang="en-US" id="id_123082_513804_2_1"> Summary of Significant Accounting Policies </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_SolasiaPharmaKKMember" xlink:label="ziop_SolasiaPharmaKKMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_SolasiaPharmaKKMember_lbl" xml:lang="en-US" id="id_123082_603784_3_1"> Solasia Pharma K K </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_SolasiaPharmaKKMember_lbl" xml:lang="en-US" id="id_123082_603784_1_1"> Solasia Pharma K K [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_SolasiaPharmaKKMember_lbl" xml:lang="en-US" id="id_123082_603784_2_1"> Solasia </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_SolasiaPharmaKKMember" xlink:to="ziop_SolasiaPharmaKKMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_SouthernResearchInstituteMember" xlink:label="ziop_SouthernResearchInstituteMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_SouthernResearchInstituteMember_lbl" xml:lang="en-US" id="id_123082_603795_3_1"> Southern Research Institute </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_SouthernResearchInstituteMember_lbl" xml:lang="en-US" id="id_123082_603795_1_1"> Southern Research Institute [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_SouthernResearchInstituteMember_lbl" xml:lang="en-US" id="id_123082_603795_2_1"> Southern Research Institute </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_SouthernResearchInstituteMember" xlink:to="ziop_SouthernResearchInstituteMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xml:lang="en-US" id="id_123082_505872_1_1"> Statement Equity Components [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xml:lang="en-US" id="id_123082_505872_2_1"> Equity Components [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_StatementEquityComponentsAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US" id="id_123082_507536_1_1"> Statement [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US" id="id_123082_507536_2_1"> Statement [Line Items] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="us-gaap_StatementOfCashFlowsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xml:lang="en-US" id="id_123082_511205_1_1"> Statement Of Cash Flows [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xml:lang="en-US" id="id_123082_511205_2_1"> Statement of Cash Flows [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="us-gaap_StatementOfFinancialPositionAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US" id="id_123082_505972_1_1"> Statement Of Financial Position [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US" id="id_123082_505972_2_1"> Statement of Financial Position [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_123082_502727_1_1"> Statement Of Stockholders Equity [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_123082_502727_2_1"> Statement of Stockholders' Equity [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfStockholdersEquityAbstract" xlink:to="us-gaap_StatementOfStockholdersEquityAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="us-gaap_StatementScenarioAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementScenarioAxis_lbl" xml:lang="en-US" id="id_123082_507189_1_1"> Statement Scenario [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementScenarioAxis_lbl" xml:lang="en-US" id="id_123082_507189_2_1"> Scenario [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementScenarioAxis" xlink:to="us-gaap_StatementScenarioAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US" id="id_123082_509593_1_1"> Statement [Table] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US" id="id_123082_509593_2_1"> Statement [Table] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US" id="id_123082_500872_1_1"> Stockholders Equity </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US" id="id_123082_500872_4_1"> Ending Balance </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US" id="id_123082_500872_5_1"> Beginning Balance </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US" id="id_123082_500872_6_1"> Total stockholders' equity </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_123082_498963_1_1"> Stockholders Equity [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_123082_498963_2_1"> Stockholders' equity: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_498764_1_1"> Stockholders Equity Note Disclosure [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xml:lang="en-US" id="id_123082_498764_2_1"> Warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:to="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US" id="id_123082_513261_1_1"> Stock Issued During Period Shares New Issues </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US" id="id_123082_513261_2_1"> Issuance of common stock in a securities offering, net of commission and expenses of $3,426 (in shares) </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US" id="id_123082_513261_12_1"> Stock issued during period </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_StockIssuedDuringPeriodSharesPublicOffering" xlink:label="ziop_StockIssuedDuringPeriodSharesPublicOffering"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_StockIssuedDuringPeriodSharesPublicOffering_lbl" xml:lang="en-US" id="id_123082_528411_3_1"> Number of shares issued during the period by an entity in a public offering. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_StockIssuedDuringPeriodSharesPublicOffering_lbl" xml:lang="en-US" id="id_123082_528411_1_1"> Stock Issued During Period Shares Public Offering </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_StockIssuedDuringPeriodSharesPublicOffering_lbl" xml:lang="en-US" id="id_123082_528411_2_1"> Issuance & sale of common stock in Public offering </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_StockIssuedDuringPeriodSharesPublicOffering" xlink:to="ziop_StockIssuedDuringPeriodSharesPublicOffering_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_lbl" xml:lang="en-US" id="id_123082_504281_1_1"> Stock Issued During Period Shares Restricted Stock Award Forfeited </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_lbl" xml:lang="en-US" id="id_123082_504281_8_1"> Forfeiture of unvested restricted common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" xlink:to="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xml:lang="en-US" id="id_123082_514694_1_1"> Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xml:lang="en-US" id="id_123082_514694_2_1"> Issuance of restricted common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:to="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US" id="id_123082_502579_1_1"> Stock Issued During Period Shares Stock Options Exercised </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US" id="id_123082_502579_2_1"> Exercise of employee stock options (in shares) </label>
<label xlink:type="resource" xlink:role="http://xbrl.us/us-gaap/role/label/negated" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US" id="id_123082_502579_8_1"> Exercised </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_StockIssuedDuringPeriodSharesStockWarrantsExercised" xlink:label="ziop_StockIssuedDuringPeriodSharesStockWarrantsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_StockIssuedDuringPeriodSharesStockWarrantsExercised_lbl" xml:lang="en-US" id="id_123082_528407_3_1"> Number of shares issued during the period as a result of the exercise of warrants. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_StockIssuedDuringPeriodSharesStockWarrantsExercised_lbl" xml:lang="en-US" id="id_123082_528407_1_1"> Stock Issued During Period Shares Stock Warrants Exercised </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_StockIssuedDuringPeriodSharesStockWarrantsExercised_lbl" xml:lang="en-US" id="id_123082_528407_2_1"> Exercise of warrants to purchase common stock (in shares) </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_StockIssuedDuringPeriodSharesStockWarrantsExercised" xlink:to="ziop_StockIssuedDuringPeriodSharesStockWarrantsExercised_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xml:lang="en-US" id="id_123082_505821_1_1"> Stock Issued During Period Value New Issues </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xml:lang="en-US" id="id_123082_505821_2_1"> Issuance of common stock in a securities offering, net of commission and expenses of $3,426 </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xml:lang="en-US" id="id_123082_507318_1_1"> Stock Issued During Period Value Stock Options Exercised </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xml:lang="en-US" id="id_123082_507318_2_1"> Exercise of employee stock options </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_StockIssuedDuringPeriodValueStockWarrantsExercised" xlink:label="ziop_StockIssuedDuringPeriodValueStockWarrantsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_StockIssuedDuringPeriodValueStockWarrantsExercised_lbl" xml:lang="en-US" id="id_123082_519857_3_1"> Value stock issued during the period as a result of the exercise of warrants. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_StockIssuedDuringPeriodValueStockWarrantsExercised_lbl" xml:lang="en-US" id="id_123082_519857_1_1"> Stock Issued During Period Value Stock Warrants Exercised </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_StockIssuedDuringPeriodValueStockWarrantsExercised_lbl" xml:lang="en-US" id="id_123082_519857_2_1"> Exercise of warrants to purchase common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_StockIssuedDuringPeriodValueStockWarrantsExercised" xlink:to="ziop_StockIssuedDuringPeriodValueStockWarrantsExercised_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_StockIssuedMember" xlink:label="ziop_StockIssuedMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_StockIssuedMember_lbl" xml:lang="en-US" id="id_123082_531033_3_1"> Stock Issued </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_StockIssuedMember_lbl" xml:lang="en-US" id="id_123082_531033_1_1"> Stock Issued [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_StockIssuedMember_lbl" xml:lang="en-US" id="id_123082_531033_2_1"> Common Stock Issued </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_StockIssuedMember" xlink:to="ziop_StockIssuedMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockOptionMember" xlink:label="us-gaap_StockOptionMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockOptionMember_lbl" xml:lang="en-US" id="id_123082_506554_1_1"> Stock Option [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockOptionMember_lbl" xml:lang="en-US" id="id_123082_506554_2_1"> Stock Option </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockOptionMember" xlink:to="us-gaap_StockOptionMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="us-gaap_SubsequentEventMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventMember_lbl" xml:lang="en-US" id="id_123082_511390_1_1"> Subsequent Event [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SubsequentEventMember_lbl" xml:lang="en-US" id="id_123082_511390_2_1"> Subsequent Event </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventMember" xlink:to="us-gaap_SubsequentEventMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="us-gaap_SubsequentEventTypeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xml:lang="en-US" id="id_123082_506663_1_1"> Subsequent Event Type [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xml:lang="en-US" id="id_123082_506663_2_1"> Subsequent Event Type [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="us-gaap_SubsequentEventTypeDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xml:lang="en-US" id="id_123082_510912_1_1"> Subsequent Event Type [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xml:lang="en-US" id="id_123082_510912_2_1"> Subsequent Event Type [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTypeDomain" xlink:to="us-gaap_SubsequentEventTypeDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="us-gaap_SubsidiarySaleOfStockAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xml:lang="en-US" id="id_123082_512768_1_1"> Subsidiary Sale Of Stock [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xml:lang="en-US" id="id_123082_512768_2_1"> Subsidiary, Sale of Stock [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SubsidiarySaleOfStockAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xml:lang="en-US" id="id_123082_498644_1_1"> Supplemental Cash Flow Information [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xml:lang="en-US" id="id_123082_498644_2_1"> Supplementary disclosure of cash flow information: </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_SupplementalCashFlowInformationAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TextBlockAbstract" xlink:label="us-gaap_TextBlockAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TextBlockAbstract_lbl" xml:lang="en-US" id="id_123082_499125_1_1"> Text Block [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TextBlockAbstract_lbl" xml:lang="en-US" id="id_123082_499125_2_1"> Text Block [Abstract] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TextBlockAbstract" xlink:to="us-gaap_TextBlockAbstract_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_TheUniversityOfTexasMDAndersonCancerCenterAndTheTexasAAndMUniversitySystemMember" xlink:label="ziop_TheUniversityOfTexasMDAndersonCancerCenterAndTheTexasAAndMUniversitySystemMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_TheUniversityOfTexasMDAndersonCancerCenterAndTheTexasAAndMUniversitySystemMember_lbl" xml:lang="en-US" id="id_123082_603793_3_1"> The University Of Texas M D Anderson Cancer Center And The Texas A And M University System </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_TheUniversityOfTexasMDAndersonCancerCenterAndTheTexasAAndMUniversitySystemMember_lbl" xml:lang="en-US" id="id_123082_603793_1_1"> The University Of Texas M D Anderson Cancer Center And The Texas A And M University System [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_TheUniversityOfTexasMDAndersonCancerCenterAndTheTexasAAndMUniversitySystemMember_lbl" xml:lang="en-US" id="id_123082_603793_2_1"> The University Of Texas M.D. Anderson Cancer Center And The Texas A& M University System </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_TheUniversityOfTexasMDAndersonCancerCenterAndTheTexasAAndMUniversitySystemMember" xlink:to="ziop_TheUniversityOfTexasMDAndersonCancerCenterAndTheTexasAAndMUniversitySystemMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_TotalMember" xlink:label="ziop_TotalMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_TotalMember_lbl" xml:lang="en-US" id="id_123082_569860_3_1"> Total </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_TotalMember_lbl" xml:lang="en-US" id="id_123082_569860_1_1"> Total [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_TotalMember_lbl" xml:lang="en-US" id="id_123082_569860_2_1"> Total </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_TotalMember" xlink:to="ziop_TotalMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TradingActivityByTypeAxis" xlink:label="us-gaap_TradingActivityByTypeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TradingActivityByTypeAxis_lbl" xml:lang="en-US" id="id_123082_506936_1_1"> Trading Activity By Type [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TradingActivityByTypeAxis_lbl" xml:lang="en-US" id="id_123082_506936_2_1"> Trading Activity [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TradingActivityByTypeAxis" xlink:to="us-gaap_TradingActivityByTypeAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TradingActivityByTypeDomain" xlink:label="us-gaap_TradingActivityByTypeDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TradingActivityByTypeDomain_lbl" xml:lang="en-US" id="id_123082_511692_1_1"> Trading Activity By Type [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TradingActivityByTypeDomain_lbl" xml:lang="en-US" id="id_123082_511692_2_1"> Trading Activity, by Type [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TradingActivityByTypeDomain" xlink:to="us-gaap_TradingActivityByTypeDomain_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_TradingSymbol_lbl" xml:lang="en-US" id="id_123082_497703_1_1"> Trading Symbol </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_TradingSymbol_lbl" xml:lang="en-US" id="id_123082_497703_2_1"> Trading Symbol </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_TradingSymbol" xlink:to="dei_TradingSymbol_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="us-gaap_TypeOfRestructuringDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TypeOfRestructuringDomain_lbl" xml:lang="en-US" id="id_123082_500805_1_1"> Type Of Restructuring [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TypeOfRestructuringDomain_lbl" xml:lang="en-US" id="id_123082_500805_2_1"> Type of Restructuring [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TypeOfRestructuringDomain" xlink:to="us-gaap_TypeOfRestructuringDomain_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_UnderwriterMember" xlink:label="ziop_UnderwriterMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_UnderwriterMember_lbl" xml:lang="en-US" id="id_123082_534907_3_1"> Underwriter </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_UnderwriterMember_lbl" xml:lang="en-US" id="id_123082_534907_1_1"> Underwriter [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_UnderwriterMember_lbl" xml:lang="en-US" id="id_123082_534907_2_1"> J. P. Morgan Securities LLC </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_UnderwriterMember" xlink:to="ziop_UnderwriterMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_UpFrontPaymentMember" xlink:label="ziop_UpFrontPaymentMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_UpFrontPaymentMember_lbl" xml:lang="en-US" id="id_123082_560796_3_1"> Up Front Payment </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_UpFrontPaymentMember_lbl" xml:lang="en-US" id="id_123082_560796_1_1"> Up Front Payment [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_UpFrontPaymentMember_lbl" xml:lang="en-US" id="id_123082_560796_2_1"> Up Front Payment </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_UpFrontPaymentMember" xlink:to="ziop_UpFrontPaymentMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ValuationTechniqueAxis" xlink:label="us-gaap_ValuationTechniqueAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ValuationTechniqueAxis_lbl" xml:lang="en-US" id="id_123082_510728_1_1"> Valuation Technique [Axis] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ValuationTechniqueAxis_lbl" xml:lang="en-US" id="id_123082_510728_2_1"> Valuation Technique [Axis] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueAxis" xlink:to="us-gaap_ValuationTechniqueAxis_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="us-gaap_ValuationTechniqueDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ValuationTechniqueDomain_lbl" xml:lang="en-US" id="id_123082_498461_1_1"> Valuation Technique [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ValuationTechniqueDomain_lbl" xml:lang="en-US" id="id_123082_498461_2_1"> Valuation Technique [Domain] </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueDomain" xlink:to="us-gaap_ValuationTechniqueDomain_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_WarrantCashExerciseMember" xlink:label="ziop_WarrantCashExerciseMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_WarrantCashExerciseMember_lbl" xml:lang="en-US" id="id_123082_532266_3_1"> Warrant, Cash Exercise </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_WarrantCashExerciseMember_lbl" xml:lang="en-US" id="id_123082_532266_1_1"> Warrant Cash Exercise [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_WarrantCashExerciseMember_lbl" xml:lang="en-US" id="id_123082_532266_2_1"> Cash exercises </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_WarrantCashExerciseMember" xlink:to="ziop_WarrantCashExerciseMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_WarrantExercisePrice" xlink:label="ziop_WarrantExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_WarrantExercisePrice_lbl" xml:lang="en-US" id="id_123082_567424_3_1"> Warrant Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_WarrantExercisePrice_lbl" xml:lang="en-US" id="id_123082_567424_1_1"> Warrant Exercise Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_WarrantExercisePrice_lbl" xml:lang="en-US" id="id_123082_567424_2_1"> Warrant exercise Price </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_WarrantExercisePrice" xlink:to="ziop_WarrantExercisePrice_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_WarrantLiabilitiesFairValueDisclosure" xlink:label="ziop_WarrantLiabilitiesFairValueDisclosure"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_WarrantLiabilitiesFairValueDisclosure_lbl" xml:lang="en-US" id="id_123082_542754_3_1"> Warrant Liabilities, Fair Value Disclosure </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_WarrantLiabilitiesFairValueDisclosure_lbl" xml:lang="en-US" id="id_123082_542754_1_1"> Warrant Liabilities Fair Value Disclosure </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_WarrantLiabilitiesFairValueDisclosure_lbl" xml:lang="en-US" id="id_123082_542754_2_1"> Warrant liability </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_WarrantLiabilitiesFairValueDisclosure" xlink:to="ziop_WarrantLiabilitiesFairValueDisclosure_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_WarrantLiabilityMember" xlink:label="ziop_WarrantLiabilityMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_WarrantLiabilityMember_lbl" xml:lang="en-US" id="id_123082_586161_3_1"> Warrant Liability </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_WarrantLiabilityMember_lbl" xml:lang="en-US" id="id_123082_586161_1_1"> Warrant Liability [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_WarrantLiabilityMember_lbl" xml:lang="en-US" id="id_123082_586161_2_1"> Liability Warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_WarrantLiabilityMember" xlink:to="ziop_WarrantLiabilityMember_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WarrantMember" xlink:label="us-gaap_WarrantMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantMember_lbl" xml:lang="en-US" id="id_123082_507958_1_1"> Warrant [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WarrantMember_lbl" xml:lang="en-US" id="id_123082_507958_2_1"> Warrant Exercise </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantMember" xlink:to="us-gaap_WarrantMember_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_WarrantResetPrice" xlink:label="ziop_WarrantResetPrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_WarrantResetPrice_lbl" xml:lang="en-US" id="id_123082_602066_3_1"> Warrant Reset Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_WarrantResetPrice_lbl" xml:lang="en-US" id="id_123082_602066_1_1"> Warrant Reset Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_WarrantResetPrice_lbl" xml:lang="en-US" id="id_123082_602066_2_1"> Revised price for warrants </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_WarrantResetPrice" xlink:to="ziop_WarrantResetPrice_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_WarrantsIssuedInInitialPublicOffering" xlink:label="ziop_WarrantsIssuedInInitialPublicOffering"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_WarrantsIssuedInInitialPublicOffering_lbl" xml:lang="en-US" id="id_123082_595662_3_1"> Warrants Issued In Initial Public Offering </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_WarrantsIssuedInInitialPublicOffering_lbl" xml:lang="en-US" id="id_123082_595662_1_1"> Warrants Issued In Initial Public Offering </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_WarrantsIssuedInInitialPublicOffering_lbl" xml:lang="en-US" id="id_123082_595662_2_1"> Warrants issued </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_WarrantsIssuedInInitialPublicOffering" xlink:to="ziop_WarrantsIssuedInInitialPublicOffering_lbl"/>
<loc xlink:type="locator" xlink:href="ziop-20120630.xsd#ziop_WarrantsToPurchaseAggregateSharesOfCommonStock" xlink:label="ziop_WarrantsToPurchaseAggregateSharesOfCommonStock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ziop_WarrantsToPurchaseAggregateSharesOfCommonStock_lbl" xml:lang="en-US" id="id_123082_557994_3_1"> Warrants To Purchase Aggregate Shares Of Common Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ziop_WarrantsToPurchaseAggregateSharesOfCommonStock_lbl" xml:lang="en-US" id="id_123082_557994_1_1"> Warrants To Purchase Aggregate Shares Of Common Stock </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ziop_WarrantsToPurchaseAggregateSharesOfCommonStock_lbl" xml:lang="en-US" id="id_123082_557994_2_1"> Warrants to purchase an aggregate of shares of common stock </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ziop_WarrantsToPurchaseAggregateSharesOfCommonStock" xlink:to="ziop_WarrantsToPurchaseAggregateSharesOfCommonStock_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_507210_1_1"> Weighted Average Number Of Diluted Shares Outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xml:lang="en-US" id="id_123082_507210_2_1"> Weighted average common shares outstanding to compute net income (loss) per share - diluted </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US" id="id_123082_510080_1_1"> Weighted Average Number Of Shares Outstanding Basic </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US" id="id_123082_510080_2_1"> Weighted average common shares outstanding to compute net income (loss) per share - basic </label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl"/>
</labelLink>
</linkbase>

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