Gritstone bio, Inc. announced updated overall survival (OS) results from its Phase 1/2 study evaluating GRANITE, an individualized vaccine-based immunotherapy, to treat advanced solid tumors. Additionally, the company announced it is presenting a “Trial in Progress” poster summarizing the Phase 2/3 GRANITE-CRC-1L- study (randomized study for first-line maintenance treatment of metastatic, microsatellite stable colorectal cancer) at the 2022 American Society for Clinical Oncology (ASCO) Annual Meeting. The Phase 1/2 study is evaluating the safety, immunogenicity, and clinical activity of GRANITE in combination with PD-1 checkpoint inhibitor, Opdivo® (nivolumab) and subcutaneous anti-CTLA-4 antibody, Yervoy® (ipilimumab) in advanced solid tumors.

This study enrolled and treated 26 patients as of ESMO 2021 presentation with previously treated, metastatic solid tumors including patients with colorectal cancer, gastroesophageal adenocarcinoma, and non-small cell lung cancer. As presented at ESMO 2021, of 9 patients with MSS-CRC who were treated and evaluable for molecular response, 4 experienced a molecular response (as evidenced by a reduction in circulating tumor DNA [ctDNA]) and continue to have an OS advantage compared to those patients who did not have a molecular response.