At 960mg, ORR and DCR were 12.0% (3/25) and 80.0% (20/25). 15 of 17 pts with other GI cancers were evaluable: 1 confirmed partial response (appendiceal), 9 stable disease (6 pancreatic, 2 appendiceal, and 1 bile duct), and 5 progressive disease. 3 pts with pancreatic cancer achieving stable disease had the best tumor burden reduction of 28.0%, 28.9%, and 31.6% from baseline, respectively. In pts with heavily pretreated KRAS p.G12C mutant GI cancers, AMG 510 was well tolerated, with the majority of pts achieving disease control.