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Several recent trials have documented extraordinary benefit from immune checkpoint therapies for melanoma, including CTLA-4 blockade with the anticytotoxic T-lymphocyte-associated-antigen-4 antibody ipilimumab. In an open-label study, patients with advanced melanoma who had failed to benefit from ipilimumab were randomized to PD-1 blockade therapy with the anti-programmed-death-receptor-1 antibody pembrolizumab (anti-PD-1) at two dosing regimens.
A total of 173 patients with metastatic melanoma whose disease had progressed by 24 weeks after the last dose of ipilimumab were randomized to one of two doses of pembrolizumab (2 mg/kg and 10 mg/kg administered intravenously every 3 weeks). An objective response rate of 26%, the trial's primary end…