Description
RAF709 is a potent inhibitor of B-RAF and C-RAF (IC
50s = 0.4 and 0.5 nM, respectively). It is selective for RAF kinases exhibiting >99% inhibition of only B-RAF, B-RAF
V600E, and C-RAF in a panel of 456 kinases. However, DDR1, DDR2, FRK, and PDGFRβ are also inhibited by >80% at a concentration of 1 μM. RAF709 inhibits phosphorylation of MEK and ERK (EC
50s = 0.02 and 0.1 μM, respectively) with minimal paradoxical activation, stabilizes BRAF-CRAF dimers (EC
50 = 0.8 μM), and reduces proliferation of Calu-6 RAS mutant cells (EC
50 = 0.95 μM). In a Calu-6 mouse non-small cell lung cancer (NSCLC) xenograft model, RAF709 (10-200 mg/kg) reduces ERK phosphorylation and decreases tumor volume in a dose-dependent manner without affecting total body weight.
Uses
RAF709 is a potent, selective, and efficacious RAF inhibitor with IC50s of 0.4 nM and 0.5 nM for BRAF and CRAF, respectively[1]. Antitumor efficacy[1].
in vivo
RAF709 proves to be soluble, kinase selective, and efficacious in a KRAS mutant xenograft model. RAF709 shows dose-proportional increases in plasma exposure and a corresponding dosedependent inhibition of pERK in Calu-6 tumors. Treatment with RAF709 results in dose-dependent antitumor activity with 10 mg/kg being subefficacious (%T/C=92%), 30 mg/kg results in measurable antitumor activity (%T/C=46%), and 200 mg/kg results in mean tumor regression of 92%, while the same high dose is not efficacious in the PC3, KRAS WT model[1].
References
[1] Nishiguchi GA, et al. Design and Discovery of N-(2-Methyl-5'-morpholino-6'-((tetrahydro-2H-pyran-4-yl)oxy)-[3,3'-bipyridin]-5-yl)-3-(trifluoromethyl)benzamide (RAF709): A Potent, Selective, and Efficacious RAF Inhibitor Targeting RAS Mutant Cancers. J Med Chem. 2017 Jun 22;60(12):4869-4881. DOI:
10.1021/acs.jmedchem.6b01862
