All patients had received at least one dose of an ICI (anti-PD-1/PD-L1, anti-CTLA-4 or both)...we identified 14 ICI-response associated genes (IRAGs) across 6 cancer types. We verified that these IRAGs were predictive rather than prognostic...while 11 IRAGs were associated with worse outcomes in MSI-L tumors. When stratifying by both MSI and TMB status, we found that among TMB-L/MSI-L patients, 3 IRAGs in BLCA and 2 in LUAD were independently associated with worse outcomes.