On November 4, 2015 Genocea Biosciences, Inc. (NASDAQ: GNCA), a biopharmaceutical company developing T cell-directed vaccines and immunotherapies, reported findings that support the potential of ATLAS, the Company’s proprietary rapid antigen identification screening system, to profile responses to immunotherapies for cancer (Press release, Genocea Biosciences, NOV 4, 2015, View Source [SID:1234507945]). This analysis, in which ATLAS identified the specificity and characteristics of T cell responses in cancer patients, will be presented as a late-breaker at the Society for Immunotherapy of Cancer (SITC) (Free SITC Whitepaper)’s (SITC) (Free SITC Whitepaper) 30th Anniversary Annual Meeting & Associated Programs in National Harbor, Maryland. The poster, #342, entitled Immunoprofiling of T cell responses in melanoma patients undergoing CPI therapy, will be presented on Saturday, November 7, 2015 between 12:00 – 2:00 p.m. ET.

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In this pilot study, funded by the Ludwig Trust, Genocea partnered with Darren Higgins, Ph.D., professor of microbiology and immunobiology at Harvard Medical School and F. Stephen Hodi, Jr., M.D., director of the Melanoma Center at Dana-Farber Cancer Institute, to conduct a retrospective analysis of 10 checkpoint inhibitor (CPI) treated patients’ T cell responses to 23 known tumor-associated antigens. By analyzing the immune responses of both responders and non-responders to CPI therapy, ATLAS successfully identified the cancer antigens to which either (or both) CD4+ or CD8+ T cells became activated. Although this research was not powered to draw firm conclusions, the analysis of T cell responses in patients receiving CPI therapy revealed a pattern indicating a greater breadth of T cell activation for responders than non-responders. The study also revealed preliminary evidence that different characteristics of T cell responses emerge when comparing patients who respond and those who do not. Some T cell responses did not correspond with improved patient outcomes, and may be classified as "decoys," further validating the ability of ATLAS to distinguish clinically relevant targets of T cell responses.

"The breakthroughs we’ve seen in the immuno-oncology field to date have been profound, yet emerging treatment approaches do not yet include an understanding of who may respond to therapy and why," said Jessica Baker Flechtner, Ph.D., senior vice president of research at Genocea. "These findings provide strong proof of concept that ATLAS can take a panoramic view of a large, diverse population of cancer patients and reveal clinically relevant signatures of protective responses. We believe we are uniquely positioned to utilize our technology to enable smarter profiling – indicating what must be present to see a benefit from therapy – as well as smarter identification of T cell antigens to drive cancer vaccine development."

The collaboration with Dana-Farber is ongoing as Genocea continues to analyze more blood samples to characterize T cell response profiles that may be prognostic of CPI efficacy, and to identify T cell antigens that may be included in novel immunotherapies.

About ATLAS

ATLAS is a first of its kind proprietary rapid antigen identification screening system that finds targets of protective T cell responses. The technology solves challenges to date associated with finding targets of T cell responses. ATLAS can examine T cell responses from large, diverse human populations, and comprehensively screen every potential antigen from a pathogen or target indication in a rapid, high-throughput manner, taking weeks versus years to find relevant antigens. Because targets identified by ATLAS are based on actual human immune responses to all potential antigens, with no guesswork or predictions, by the time these candidates reach clinical trials there may be a greater likelihood of success in clinical development. This approach provides the ability to identify smarter targets for use in developing vaccines and immunotherapies to treat infectious disease, cancer and autoimmunity.