BL characteristics were generally similar between Part 1 (n = 60) and Part 2 (n = 170), and across tTMB and bTMB subgroups. At 12.5-mo minimum follow up, ORR in Part 1 was 30% and 39% in PD-L1 ≥1% (n = 30) and <1% (n = 28) subgroups, respectively. ORR by TMB (Parts 1 and 2 combined) is shown in the table....In CheckMate 592, high tTMB and bTMB were associated with better responses to 1L NIVO + IPI in pts with mNSCLC.