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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_MrCaseMember" xlink:label="loc_GTHPMrCaseMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_MrGrimmMember" xlink:label="loc_GTHPMrGrimmMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_MrMamulaMember" xlink:label="loc_GTHPMrMamulaMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_DrImhoffMember" xlink:label="loc_GTHPDrImhoffMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_MsRosenstockMember" xlink:label="loc_GTHPMsRosenstockMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_DebtInstrumentAccruedInterest" xlink:label="loc_GTHPDebtInstrumentAccruedInterest"/> |
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| | <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapLongtermDebtTypeAxis" order="20"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_Note1Member" xlink:label="loc_GTHPNote1Member"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_Note2Member" xlink:label="loc_GTHPNote2Member"/> |
| | <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_GTHPNote2Member" xlink:type="arc"/> |
| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_Note3Member" xlink:label="loc_GTHPNote3Member"/> |
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| | <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapLongtermDebtTypeAxis" order="30"/> |
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| | <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapLongtermDebtTypeAxis" xlink:to="loc_us-gaapLongtermDebtTypeDomain" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_ConvertibleNotesInDefaultMember" xlink:label="loc_GTHPConvertibleNotesInDefaultMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_ConvertibleNotesPayableInDefault" xlink:label="loc_GTHPConvertibleNotesPayableInDefault"/> |
| | <link:presentationArc order="0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_GTHPConvertibleNotesPayableInDefault" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/> |
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| | <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" order="10"/> |
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| | <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="gthp-20200331.xsd#GTHP_DrFaupelMember" xlink:label="loc_GTHPDrFaupelMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedSalariesCurrentAndNoncurrent" xlink:label="loc_us-gaapAccruedSalariesCurrentAndNoncurrent"/> |
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