Among mice with kras-mutant tumors, single-agent JQ1 provoked a partial response in 100% of treated animals, defined by a greater than 30% reduction in tumor volume (Fig. 5A and B). Mice bearing kras-mutant tumors responded significantly better than mice with mutant kras tumors with concurrent lkb1 loss (Fig. 5A and B; Fisher exact test, P = 0.015)...