The impressive clinical responses obtained with immune checkpoint inhibitors (anti-PD-1/PDL-1, anti-CTLA-4) indicate that the presence of preexisting antitumor immune response might be required for their efficacy and highlight the critical role of antitumor T cell immunity.

Recent progresses on the field of tumor immunology underline the critical role of CD4 helper 1 T lymphocyte (TH1) in the control of innate and adaptive anticancer immunity. Therefore, monitoring tumor specific TH1 response could be relevant in cancer patients.

In order to monitor tumor-specific CD4 Th1 responses in most cancer patients, the investigators team have previously described novel promiscuous peptides (referred as UCP: Universal Cancer Peptides) derived from human telomerase (TERT), a prototype of shared tumor antigen.

By using UCP-based immuno-assay, UCP specific Th1 immune responses will be evaluated in this study in melanoma before and after treatment.

Inclusion Criteria:

• patient with melanoma, any stade, without history of anti-cancer treatment (surgery, chemotherapy, targeted therapy, immunotherapy...) except for patients with stade IV melanoma for which immunotherapy or targeted therapy is considered. In this case, a first-line chemotherapy treatment is allowed
• written informed consent

Exclusion Criteria:

• patient with immunosuppressive treatment
• active autoimmune diseases, HIV, hepatitis C or B virus
• patients under guardianship, curatorship or under the protection of justice, pregnant women