...Twenty-five pts with NSCLC were enrolled in each cohort….Six pts in Cohort A (24%) and 2 pts in Cohort B (8%) had a confirmed partial response for a disease control rate (CR+PR+SD) of 52% and 64%, respectively. In Cohort A, the ORR in pts with strong (≥50% TC) PD-L1 staining (n=13) was 31% vs. 17% in pts with weak (1-49% TC) PD-L1 expression (n=12)....Antitumor activity was remarkable in the KRAS-mut nonsquamous NSCLC but not noticeably higher as compared to historical data for pembrolizumab monotherapy.