CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-202043, No. 333-207745, No. 333-195084) and Registration Statements on Form S-8 (No. 333-210089, 333-202476,No. 333-196249, No. 333-187107, 333-180149, No. 333-173047, No. 333-167260, No. 333-164865, No. 333-156733, No. 333-126276, No. 333-134598, and No. 333-143130) pertaining to the 2014 Equity Incentive Plan, the Amended and Restated 2004 Equity Incentive Plan, the 2004 Equity Incentive Plan, the Amended and Restated 2004 Employee Stock Purchase Plan and the 2004 Employee Stock Purchase Plan of Threshold Pharmaceuticals, Inc. of our reports dated March 27, 2017, with respect to the consolidated financial statements of Threshold Pharmaceuticals, Inc. included in this Annual Report (Form 10-K) for the year ended December 31, 2016.
/s/ Ernst & Young LLP
Redwood City, California
March 27, 2017