Vemurafenib and Panitumumab Combination Therapy in Patients With BRAF V600E Mutated Metastatic Colorectal Cancer

Treatment will consist of panitumumab 6mg/kg IV every 14 days and vemurafenib 960mg orally twice daily. In patients who initially respond to treatment and later progress, a voluntary biopsy will be requested at the time of relapse to study mechanisms of acquired resistance. This biopsy should consist of at least one frozen core specimen. Every effort will be made to obtain this biopsy within 30 days of discontinuation of treatment and before the initiation of any new tumor-directed therapies.