Tocagen Reports First Quarter 2019 Financial and Business Results

Tocagen Reports First Quarter 2019 Financial and Business Results

SAN DIEGO - May 7, 2019 - Tocagen Inc. (Nasdaq: TOCA), a clinical-stage, cancer-selective gene therapy company, today reported financial results and business highlights for the first quarter ended March 31, 2019.

"We had a strong start to the year with excellent progress on multiple fronts related to our Phase 3 Toca 5 trial of Toca 511 & Toca FC in patients with recurrent high grade glioma and potential commercial launch," said Marty Duvall, chief executive officer of Tocagen. "We ended the quarter well capitalized to fund operations into 2020 and look forward to the pending interim analysis of the Toca 5 trial this quarter and the final analysis by the end of the year."

First Quarter 2019 and Recent Highlights

First Quarter 2019 Financial Results

Research and Development (R&D) Expenses: R&D expenses were $12.4 million for the quarter ended March 31, 2019, compared to $10.4 million for the quarter ended March 31, 2018. The R&D expenses in both periods were primarily driven by costs to support the Toca 5 trial and to support the manufacturing of drug product. The increase in 2019 reflects primarily higher manufacturing spend as compared to the same period in 2018.

General and Administrative (G&A) Expenses: G&A expenses were $4.4 million for the quarter ended March 31, 2019, compared to $2.4 million for the quarter ended March 31, 2018. The increase in G&A expenses was primarily due to higher personnel costs and contracted services to support the increased activity.

Net Loss: Net loss was $17.1 million, or $0.74 per common share (basic and diluted), for the quarter ended March 31, 2019, compared to a net loss of $12.9 million, or $0.65 per common share (basic and diluted), for the quarter ended March 31, 2018. The 2019 calculation is based on 23.0 million average common shares outstanding for the first quarter of 2019, compared to 19.9 million average common shares outstanding for the first quarter of 2018. Our average shares outstanding increased primarily as a result of selling 3.0 million shares in a public offering in December 2018.

Cash, cash equivalents and marketable securities were $80.1 million at March 31, 2019 compared to $96.1 million at December 31, 2018.

About Toca 511 & Toca FC

Tocagen's lead product candidate is a two-part cancer-selective immunotherapy comprising an investigational biologic, Toca 511 (vocimagene amiretrorepvec), and an investigational small molecule, Toca FC (flucytosine, extended-release). Toca 511 is a retroviral replicating vector (RRV) that selectively infects cancer cells and delivers a gene for the enzyme, cytosine deaminase (CD). Through this targeted delivery, infected cancer cells carry the CD gene and produce CD. Toca FC is an orally administered prodrug, 5-fluorocytosine (5-FC), which is converted into an anti-cancer drug, 5-fluorouracil (5-FU), when it encounters CD. 5-FU kills cancer cells and immune-suppressive myeloid cells resulting in anti-cancer immune activation and subsequent tumor killing.

Tocagen is a clinical-stage, cancer-selective gene therapy company developing first-in-class, broadly applicable product candidates designed to activate a patient's immune system against their own cancer. Tocagen's lead investigational product candidate, Toca 511 & Toca FC, is under evaluation in a pivotal Phase 3 trial (Toca 5) for recurrent high grade glioma (HGG), a disease with significant unmet medical need. The U.S. Food and Drug Administration awarded Tocagen an orphan drug grant for the Toca 5 trial and has granted Toca 511 & Toca FC Breakthrough Therapy Designation for the treatment of recurrent HGG. The European Medicines Agency has granted Toca 511 PRIME (PRIority MEdicines) designation for the treatment of glioma.

Forward-Looking Statements

Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited

to, statements regarding our business plans and objectives, expectations regarding the timing and results of our and our collaborator's clinical trials and planned clinical trials, expectations regarding the timing of regulatory submissions and reviews, expectations regarding our preclinical research and development activities, expectations regarding our use of cash in 2019, and plans related to development of our current and future product candidates in additional indications. Risks that contribute to the uncertain nature of the forward-looking statements include: the success, cost and timing of our product candidate development activities and planned clinical trials; our ability to execute on our strategy; regulatory developments in the United States and foreign countries; and our estimates regarding expenses, future revenue and capital requirements. These and other risks and uncertainties are described more fully under the caption "Risk Factors" and elsewhere in Tocagen's filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made. Tocagen undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.

CONDENSED BALANCE SHEETS

CONDENSED STATEMENTS OF OPERATIONS

(in thousands, except share and per share data)

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