Three-Year Overall Survival With Nivolumab Plus Relatlimab in Advanced Melanoma From RELATIVITY-047.

Nivolumab plus relatlimab demonstrated a statistically significant improvement in progression-free survival (PFS), along with a clinically meaningful, but not statistically significant improvement in overall survival (OS) and a numerically higher objective response rate (ORR) compared with nivolumab in the RELATIVITY-047 trial (ClinicalTrials.gov identifier: NCT03470922). We report updated descriptive efficacy and safety results from RELATIVITY-047 with a median follow-up of 33.8 months. Median PFS was 10.2 months (95% CI, 6.5 to 15.4) with nivolumab plus relatlimab and 4.6 months (95% CI, 3.5 to 6.5) with nivolumab (hazard ratio [HR], 0.79 [95% CI, 0.66 to 0.95]); median OS was 51.0 months (95% CI, 34.0 to not reached) and 34.1 (95% CI, 25.2 to 44.7) months, respectively (HR, 0.80 [95% CI, 0.66 to 0.99]). ORR was 43.7% (95% CI, 38.4 to 49.0) with nivolumab plus relatlimab and 33.7% (95% CI, 28.8 to 38.9) with nivolumab. Efficacy across the majority of prespecified subgroups favored the combination. No new or unexpected safety signals were identified. Overall, at 3-year follow-up, the benefit observed with nivolumab plus relatlimab compared with nivolumab in patients with advanced melanoma was sustained, with the OS HR 95% CI upper bound now <1. This benefit is accompanied by a safety profile consistent with previous reports.