On September 30, 2018 Tocagen Inc. (Nasdaq: TOCA), a clinical-stage, cancer-selective gene therapy company, today is presenting data describing the tumor microenvironment and immunogenicity of Toca 511 (vocimagene amiretrorepvec) & Toca FC (flucytosine, extended-release) in patients with solid tumor malignancies at the International Cancer Immunotherapy Conference (CIMT) (Free CIMT Whitepaper) hosted by The Cancer Research Institute (CRI), the Association for Cancer Immunotherapy (CIMT) (Free CIMT Whitepaper), the European Academy of Tumor Immunology (EATI), and the American Association for Cancer Research (AACR) (Free AACR Whitepaper) in New York City (Press release, Tocagen, SEP 30, 2018, View Source;p=RssLanding&cat=news&id=2369481 [SID1234529699]). The lead author is Jaime Merchan, M.D., director, Phase 1 clinical trials program at Sylvester Comprehensive Cancer Center; associate professor of medicine at the University of Miami Miller School of Medicine.

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The poster describes data available as of August 31st for 20 patients with advanced solid tumors, including colorectal, sarcoma, pancreas and non-small cell lung cancer, treated with intravenous Toca 511 followed by oral Toca FC in the Phase 1b Toca 6 clinical trial. Among these patients, 15 also received Toca 511 via intratumoral administration.

In this preliminary analysis of immune activation in patients with advanced solid tumors, analysis of peripheral blood shows immune cell modulation that is consistent with what has been observed in preclinical studies and in patients with recurrent high grade glioma treated with Toca 511 & Toca FC in previous clinical trials. In addition, available tumor samples from three patients show Toca 511 infected both "hot" (T cells present) and "cold" (T cells low or absent) areas of metastatic tumor, suggesting Toca 511 can penetrate multiple tumor microenvironments. Toca 511 & Toca FC treatment was well tolerated.

"The encouraging preliminary immune activity data from the Toca 6 trial continue to support the proposed mechanism of action for Toca 511 & Toca FC and its potentbiial in the treatment of multiple cancers," said Asha Das, M.D., chief medical officer of Tocagen. "We look forward to advancing expansion opportunities for our lead product in patients with solid tumors."

CRI-CIMT-EATI-AACR Abstract/Poster Number: A018
Abstract Title: Effects of Toca 511 & Toca FC on tumor microenvironment and peripheral blood populations in patients with advanced malignancies
Date: Sunday, September 30, 2018
Time: 11:45 a.m. – 2:15 p.m. ET
The poster is available on Tocagen’s website.

About Toca 6
Toca 6 is a multi-center, open-label Phase 1b study evaluating Toca 511 & Toca FC in patients with advanced solid tumors. The study will evaluate the safety and presence of Toca 511 genes in tumors of patients with widely disseminated disease, immunologic activity in blood and tumor, and clinical activity such as tumor response and clinical benefit. More information can be found at www.tocagen.com/toca6 or by searching clinicaltrials.gov using the clinical trial identifier NCT02576665.

About Toca 511 & Toca FC
Tocagen’s lead product candidate is a two-part cancer-selective immunotherapy comprising an investigational biologic, Toca 511, and an investigational small molecule, Toca FC. 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, only 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.