Kaplan‐Meier curves of progression‐free survival and overall survival by treatment arm. Abbreviations: Nivo 1 + Ipi 3 Q3, nivolumab 1 mg/kg i.v. plus ipilimumab 3 mg/kg i.v. every 3 weeks for four cycles, followed by nivolumab 240 mg i.v. every 2 weeks; Nivo 3 + Ipi 1 Q3, nivolumab 3 mg/kg i.v. plus ipilimumab 1 mg/kg i.v. every 3 weeks for four cycles, followed by nivolumab 240 mg i.v. every 2 weeks; Nivo 3 Q2 + Ipi 1 Q6, nivolumab 3 mg/kg i.v. every 2 weeks plus ipilimumab 1 mg/kg i.v. every 6 weeks; OS, overall survival; PFS, progression‐free survival.