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Progression-free survival (PFS) by tumor programmed death ligand 1 (PD-L1) expression per investigator. (A) NIVO3 (nivolumab 3 mg/kg monotherapy every 2 weeks). (B) NIVO3+IPI1 (nivolumab 3 mg/kg plus ipilimumab 1 mg/kg every 3 weeks for four doses followed by nivolumab monotherapy 3 mg/kg every 2 weeks). (C) NIVO1+IPI3 (nivolumab 1 mg/kg plus ipilimumab 3 mg/kg every 3 weeks for four doses followed by nivolumab monotherapy 3 mg/kg every 2 weeks).
