Part B of CheckMate 914 trial showed no disease-free survival benefit with adjuvant nivolumab vs placebo in high-risk localized renal cell carcinoma patients post-nephrectomy, consistent with Part A results. Median disease-free survival was not reached in nivolumab or placebo groups, with 18-month rates of 78.4% vs 75.%, respectively (HR = 0.87, 95% CI = 0.62–1.21, P = .40). Grade 3 to 4 adverse events were reported in 17.2%, 15.0%, and 28.9% of patients given nivolumab, placebo, and nivolumab/ipilimumab, respectively.