Real-World Evidence of Adjuvant Immunotherapy in Resected Stage III and IV Melanoma Patients: CADIM Trial Final Results. Experience from 2 Tertiary Referral Centers.

Introduction: Clinical trials have validated the use of nivolumab and pembrolizumab as adjuvant therapies regarding relapse-free survival in patients with resected stage III and IV melanoma. Evidence in real-world patients is currently limited.

Material And Method: The CADIM trial (Characterization of adjuvant immunotherapy in melanoma patients) recruited a total of 81 patients with resected stage III and IV melanoma on nivolumab or pembrolizumab as adjuvant therapy from February 2018 through December 2022.

Results: The stage distribution rate was 81.5% (n=71) for stage III, while 15 patients (18.5%) had resected stage IV. Among stage III patients, 38 were stage IIIC (46.9%). With a median follow-up of 22.8 months, the relapse-free survival in the intention-to-treat population was 84% at one year and 81.5% at 2 years. The overall survival rate was 99% at one year and 91.4% at 2 years. Grade 3-4 treatment-related adverse events were reported in 12.3% of the patients.

Conclusions: This study shows the results of resected stage III and IV melanoma patients on adjuvant therapy with anti-PD-1, and eventually confirmed the safety and efficacy profile described by clinical trials. Comparing clinical trial data with real-world evidence is necessary for a more practical, reliable, and accessible use of these drugs.