The effects of a high-fat meal on single-dose vemurafenib pharmacokinetics

Abstract

Vemurafenib is an orally bioavailable BRAF inhibitor approved for the treatment of BRAFV600-mutant metastatic melanoma. It is important to understand the effects of a high-fat meal on the pharmacokinetics (PK) of vemurafenib in humans because it is a Biopharmaceutics Classification System Class IV drug and its PK can be altered by food. An open-label, multicenter, randomized, 2-period crossover study was performed to evaluate the effect of food (high-fat meal) on the PK of a single oral dose of vemurafenib. Secondary objectives were safety and tolerability, efficacy with best overall response rate, and overall survival during the treatment period. The concomitant intake of food (high-fat meal) increased mean Cmax 3.5 to 7.5 μg/mL and mean AUC0-α 119 to 360 μg·h/mL after a single 960 mg dose of vemurafenib (N = 13-15 patients). An effect of food on single-dose exposure is suggested by point estimates and 90% CI of geometric mean ratios for vemurafenib plasma AUC0-α (4.7) and Cmax (2.5). Toxicity and response rate of vemurafenib in this study were consistent with prior experience in patients with BRAFV600-mutant metastatic melanoma. A high-fat meal increased the exposure to vemurafenib without altering the mean terminal half-life. © 2014, The American College of Clinical Pharmacology.