RO5126766 (CH5126766, VS 6766) is a first-in-class dual MEK/RAF inhibitor with IC50 values of 8.2 nM, 19 nM, 56 nM and 160 nM for BRAF V600E, BRAF, CRAF and MEK1, respectively. In HCT116 KRAS-mutant colorectal cancer cells, CH5126766 significantly reduces the levels of phospho-MEK and phospho-ERK. CH5126766 inhibits RAF kinase by binding to MEK1, and causes MEK to become a dominant negative inhibitor of RAF. In Raf or RAS-mutant cell lines SK-MEL-28, SK-MEL-2, MIAPaCa-2, SW480, HCT116, and PC3 cells, CH5126766 inhibits cell growth with IC50 of 65, 28, 40, 46, and 277 nM, respectively.
In vivo, RO5126766 (25 mg/kg, p.o.) inhibits ERK signaling output more effectively in an HCT116 (G13D KRAS) mouse xenograft model than a standard MEK inhibitor that induces MEK phosphorylation, and has potent antitumor activity. In the HCT116 (K-ras) and COLO205 (B-raf) mutant xenografts, CH5126766 (0.3 mg/kg) causes significant decreases in [18F]FDG uptake.
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
|Solubility||DMSO 90 mg/mL|
 Tetyana Tegnebratt, et al. EJNMMI Res. [18 F]FDG-PET imaging is an early non-invasive pharmacodynamic biomarker for a first-in-class dual MEK/Raf inhibitor, RO5126766 (CH5126766), in preclinical xenograft models
 Maria Martinez-Garcia, et al. Clin Cancer Res. phase I dose-escalation study of the safety, pharmacokinetics, and pharmacodynamics of RO5126766, a first-in-class dual MEK/RAF inhibitor in patients with solid tumors
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