In the ICI-treated patients cohort (N = 1572), 96 patients (6.1%) had STK11 alterations. Patients with STK11 alterations had higher median tumor mutation burden (TMB) than patients without STK11 alterations (8.81 mut/Mb vs. 5.87 mut/Mb, p < 0.0001)...In a large cohort of ICI-treated patients with multiple cancers, STK11 alterations were associated with worse mOS despite having higher TMB.