Exhibit 23.2
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in the Prospectus constituting a part of this Registration Statement on FormS-8 pertaining to the Mateon Therapeutics, Inc. 2017 Equity Incentive Plan, of our report dated March 30, 2017 (which report expresses an unqualified opinion and includes an explanatory paragraph expressing substantial doubt about the Company’s ability to continue as a going concern), relating to the financial statements of Mateon Therapeutics, Inc. appearing in the Company’s Annual Report on Form10-K for the year ended December 31, 2016.
We also consent to the reference to us under the caption “Experts” in the Prospectus.
/s/ OUM & CO. LLP
San Francisco, California
March 30, 2017