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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].

RAF709 stabilizes BRAF-CRAF dimers with an EC50 of 0.8 μM. In cellular assays, the dose-response of pMEK and pERK are measured in Calu-6 cells with EC50=0.02 and 0.1 μM with minimal paradoxical activation and inhibition of proliferation with EC50=0.95 μM[1].

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].

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