Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our reportdated March 7, 2016 relating to the financial statements, which appears in CytomX Therapeutics, Inc.’s Annual Report on Form10-K for the year ended December 31, 2015.
/s/ PricewaterhouseCoopers LLP
San Jose, California
March 7, 2016
