Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the following Registration Statements:
(1) Registration Statement (Form S-3 No. 333-224880) of Tocagen Inc.,
(2) Registration Statement (Form S-8 No. 333-223558) pertaining to the 2017 Equity Incentive Plan and the 2017 Employee Stock Purchase Plan of Tocagen Inc., and
(3) Registration Statement (Form S-8 No. 333-217300) pertaining to the 2009 Equity Incentive Plan, 2017 Equity Incentive Plan, and 2017 Employee Stock Purchase Plan of Tocagen Inc.;
of our report dated February 27, 2019, with respect to the financial statements of Tocagen Inc. included in this Annual Report (Form 10-K) of Tocagen Inc. for the year ended December 31, 2018.
/s/ Ernst & Young LLP
San Diego, California
February 27, 2019