We conducted a phase II trial in patients with melanoma whose tumors harbored a BRAF mutation. Patients were stratified by phosphorylated-AKT (pAKT) expression (high vs. low) and treated with selumetinib 75 mg per os twice daily....Among the two nonresponding, low pAKT patients with melanoma, co-mutations in MAP2K1, NF1, and/or EGFR were detected.