Gritstone Announces Dosing of First Solid Tumor Patient with Optimized SLATE “Off-the-Shelf” Mutant KRAS-directed Neoantigen Immunotherapy in Phase 2 Clinical Trial

Excerpt from the Press Release:

• SLATE version (v) 1, Gritstone’s “off the-shelf” neoantigen immunotherapy (including KRAS, TP53 mutations), elicited multiple molecular responses and an unconfirmed RECIST radiologic response in patients with NSCLC who had progressed on prior immunotherapy
• SLATE v2 (a mutant KRAS-focused version), which is optimized for increased immune response, has been administered to the first patient in Phase 2 testing

EMERYVILLE, Calif., Sept. 17, 2021 (GLOBE NEWSWIRE) —  Gritstone bio, Inc. (Nasdaq: GRTS), a clinical-stage biotechnology company developing next generation cancer and infectious disease immunotherapies, today announced results with its SLATE v1 product (“off-the-shelf” shared neoantigen immunotherapy in combination with intravenous nivolumab and subcutaneous ipilimumab) and dosing of the first patient in a Phase 2 clinical trial of the optimized SLATE v2 product. SLATE v2 has been engineered, based on human translational immunology data from v1 patients, to drive a more potent immune response to mutant KRAS neoantigens than were observed with SLATE v1. The data from SLATE v1 will be reviewed during the company’s previously announced investor event taking place today at 1:30pm ET.

The v1 format of the SLATE immunotherapy was studied in a Phase 1/2 study, in collaboration with Bristol-Myers Squibb, in 26 patients with metastatic solid tumors, largely focused on non-small cell lung cancer (NSCLC), microsatellite-stable colorectal cancer (MSS-CRC) and pancreatic ductal adenocarcinoma (PDAC). There were no safety signals of note with the most common adverse events being low grade, self-limiting fever and injection site reactions. SLATE v1 exhibited evidence of efficacy in patients with NSCLC who had all progressed on prior anti-PD-(L)1 therapy (often in combination with chemotherapy) – with molecular responses (>50% decrease in ctDNA levels in the blood from baseline) observed in 3/5 NSCLC patients who were eligible for analysis.

Click the button below to read the entire Press Release:

Continue Reading The Press Release