Gritstone bio Shares Jump After Updated Overall Survival Data From Colorectal Cancer Candidate


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  • Gritstone bio Inc (NASDAQ:GRTSannounced updated overall survival (OS) results from its Phase 1/2 study evaluating GRANITE, an individualized vaccine-based immunotherapy for advanced solid tumors. 
  • 6 of 13 treated patients with metastatic, microsatellite stable colorectal cancer (MSS-CRC) had a molecular response. The observed overall survival in this group will now exceed 22 months (median OS not yet reached versus 7.8 months in those without a molecular response). 
  • Related: Gritstone's Cancer Drug Shows Strong Tumor-Specific Responses In Various Settings.
  • This compares to a median overall survival not yet reached and exceeding 18 months, as reported in May 2022.
  • 4 of 6 patients with molecular response had liver metastasis.
  • All patients had PD-L1 expression <1% and low levels of ifng-related gene expression.< li>
  • The median tumor mutational burden was 2.9 and 3.6 mutations/MB in those with and without molecular response, respectively.
  • Price Action: GRTS shares are up 10.85% at $2.61 on the last check Thursday.

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