In KRAS G12C mt NSCLC models in vivo, VS-6766 combination augmented tumor growth inhibition by sotorasib, whereas trametinib combination was much less effective in augmenting sotorasib efficacy...sotorasib + VS-6766 induced >25% tumor regression in 10/10 mice. Similarly, in the H2122 KRAS G12C mt NSCLC model, sotorasib + VS-6766 induced >20% tumor regression in 5/10 mice while sotorasib or sotorasib + trametinib were relatively ineffective.