We consent to the incorporation by reference in the Registration Statements on Form S-8 (No.’s
333-120579 and
333-110085) and Form S-3 (No.
333-120302), of our reports dated
March 9, 2006, with
respect to (i) the consolidated financial statements of CancerVax Corporation, and (ii)
management’s assessment of the effectiveness of internal control over financial reporting, and the
effectiveness of internal control over financial reporting of CancerVax Corporation included in the
Annual Report (Form 10-K) for the year ended
December 31, 2005.