Significant antitumor activity of APG-1842 was also confirmed in a panel of 8 KRASG12C-mutated patient-derived xenograft models derived from patient samples of lung, colorectal, and gastric cancers. Collectively, these preclinical results suggest that APG-1842 is a potent, bioavailable, and highly selective KRASG12C inhibitor, laying a foundation for clinical development of this agent for patients with KRASG12C-mutant solid tumors.