(-)-Nutlin-3 is an inhibitor of the protein-protein interaction between p53 and Mdm2 (IC50 = 0.09 µM). It increases p53 levels, induces apoptosis, and reduces cell viability in HCT116, SJSA-1, and RKO cells that express wild-type p53 but not MDA-MB-435 or SW480 cells expressing mutant p53. (-)-Nutlin-3 (200 mg/kg)...