Adjuvant nivolumab and relatlimab in stage III/IV melanoma: the randomized phase 3 RELATIVITY-098 trial.

Based on RELATIVITY-047, nivolumab plus relatlimab is approved for advanced melanoma. Here, to address a current unmet need for more efficacious adjuvant regimens for completely resected melanoma, the phase 3, double-blind RELATIVITY-098 trial compared adjuvant nivolumab plus relatlimab to nivolumab after complete resection of stage III/IV melanoma. Patients were randomized 1:1 to receive nivolumab 480 mg plus relatlimab 160 mg (n = 547) or nivolumab 480 mg (n = 546) intravenously every 4 weeks for ≤1 year; safety populations totaled 543 and 545 patients, respectively. The primary endpoint was recurrence-free survival (RFS), and the key secondary was overall survival; translational endpoints were exploratory. There was no difference in RFS for nivolumab plus relatlimab versus nivolumab (hazard ratio = 1.01; 95% confidence interval: 0.83-1.22; P = 0.928); therefore, overall survival was not tested. Translational data across trials showed lower circulating LAG-3 T cells in the adjuvant setting (RELATIVITY-098) versus advanced melanoma (RELATIVITY-047), where LAG-3 T cells were enriched in tumor versus blood. The absence of macroscopic tumor and reduced peripheral LAG-3 T cells may explain the lack of added benefit of nivolumab plus relatlimab over nivolumab in resected versus metastatic melanoma. ClinicalTrials.gov identifier: NCT05002569 .