Revolution Medicines publishes KRASG12C-selective inhibitors data in Science

Revolution Medicines announced the publication of a peer-reviewed research paper in Science. This original research was led by scientists at Revolution Medicines and conducted in collaboration with researchers from Memorial Sloan Kettering Cancer Center. The paper describes the Revolution Medicines tri-complex inhibitor approach to developing novel small molecules with high affinity and selectivity for the active state of mutant RAS, or RAS(ON), proteins that are common causes of human cancer and were previously considered undruggable. Specifically, it describes the creation of product-inspired, orally bioavailable small molecules, including the tool compound RMC-4998 and the clinical candidate RMC-6291. These compounds are shown to remodel the surface of the cellular chaperone cyclophilin A, or CYPA, to create a neomorphic interface with affinity for active KRAS and achieve high selectivity for mutant KRASG12C via covalent, irreversible binding to the cysteine residue in the active state of this variant RAS protein that often drives formation of lung and colorectal cancers. KRASG12C(ON) trapped in these tri-complexes is sterically blocked from interacting with downstream effectors that transmit cancer-causing signals. Both RMC-4998 and RMC-6291 inactivate oncogenic signaling in KRASG12C-dependent tumor cells and drive deep and durable tumor regressions in human xenograft models of these cancers.