Patients with KRAS G12C-mutated NSCLC were administrated D-1553 600 mg orally once daily, 800 mg once daily, 1200 mg once daily, 400 mg twice a day, or 600 mg twice a day in dose escalation….Among 74 patients evaluable for efficacy analysis, 30 patients had partial response (PR) and 38 had stable disease (SD) with a confirmed ORR and DCR of 40.5% and 91.9%, respectively. The median PFS was 8.2 months, and the median DOR was 7.1 months. Among 62 patients evaluable for response at the recommended phase 2 dose (RP2D), PR occurred in 24 patients (ORR, 38.7%) and SD in 32 patients (DCR, 90.3%).