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Association details:
Biomarker:MSI-H/dMMR + TMB-L
Cancer:Colorectal Cancer
Drug Class:PD1 inhibitor
Direction:Resistant
Evidence:
Evidence Level:
Resistant: C3 – Early Trials
Title:

A low tumor mutational burden and PTEN mutations are predictors of a negative response to PD-1 blockade in MSI-H/ dMMR gastrointestinal tumors

Published date:
04/29/2021
Excerpt:
Forty-five patients with MSI-H/dMMR GI tumors, including gastric cancer, colorectal cancer, cholangiocarcinoma, small intestine cancer, pancreatic cancer, and duodenal cancer, receiving PD-1 blockade were analyzed....Patients with low tumor mutational burdens (TMBs) had lower objective response rates (ORRs) (0 vs 48.8%) and a significantly shorter progression-free survival (PFS) (2.3 vs 15.6 months; hazard ratio (HR): 6.20, P = 0.002) than those with high TMBs....Low TMBs and PTEN mutations...negative predictors of PD-1 blockade responses in patients with MSI-H/dMMR GI tumors.
DOI:
10.1158/1078-0432.CCR-21-0401