Follow-up of a National Cohort of Melanoma Resectable Stage II, Stage III or IV Patients or Unresectable Primary

Prevention of melanoma can be efficient but mortality remains unchanged and 15 to 20% of patients still die from melanoma. Indeed metastatic melanoma is a heterogeneous highly and multiple mutations driven cancer. Significant survival benefit was demonstrated since 2011 with anti-CTLA4 +/- programmed death-1 (anti PD1) antibodies, B-Raf proto-oncogene, serine/threonine kinase (BRAF) and MAP-ERK kinase (MEK) inhibitors. Future improvement of advanced melanoma prognosis will rely on clinico-epidemiological studies and on biological studies to validate and identify new prognostic and predictive factors based on clinico-epidemiological and histological data, genomic host and tumor alterations, tumor microenvironment characteristics, individual immunological profile and functional imaging. In the context of marketing of costly innovative molecules, prospective collection of economic data on treatment and toxicity are required. Large biobanks collecting data from cohorts of advanced melanoma are mandatory for such projects. MELBASE is a French prospective national cohort enrolling advanced melanoma patients whose objectives are to : * provide an annual instrument panel with descriptive and correlative analysis of advanced melanoma patients in France including epidemiological, clinical, biological and economic characteristics * validate and identify new clinical, epidemiological, and biological prognostic factors such as genomic host and tumor alterations, tumor microenvironment characteristics, individual immunological profile in advanced melanoma * evaluate the risk-benefit, quality of life, the management cost of patients treated with validated and future treatments. The project also aims to define predictive biomarkers of response and toxicity including pharmacogenetics and tumor genetics alterations, tumor microenvironment characteristics, individual immunological profile. Patients with resectable stage II or III will be enrolled since June 2023 with a 10 years follow-up. Patients with unresectable stage III or IV (resectable or not) or unresectable primary melanoma will be enrolled prospectively since March 2013 with a 10 years follow-up (up to 6000 patients) from 27 French centers.