A Feasibility Study to Identify T-cell Responses to Neo-epitopes in Tumor Invaded Lymph Nodes (NeoEpitope)

Inclusion Criteria: Patients over 18 years Patient with HR+ , HER2- and node-positive (proven by cytology) invasive ductal carcinoma breast cancer, grade (SBR) II or III, and having an axillary dissection programmed, Or patient having cutaneous melanoma scheduled for a lymph node dissection at the Institut Curie including dissection of the lymph nodes draining the tumor, Voluntary having signed and dated written informed consents prior to any specific study procedure, Exclusion Criteria: Patients treated for a breast cancer who received neoadjuvant chemotherapy Patients treated for breast cancer with distant metastases (M+)• Only for patients with breast cancer: oral or systemic corticosteroids treatment received within 30 days prior surgery Patients on immunosuppressive treatment or diagnosed of an immunodeficiency Patients with known chronic viral infection as HIV1 or 2, HBV, HCV Patients with other cancer diagnosed within 5 years (except squamous cell cutaneous carcinomas) Patients without a French social security Patients deprived of liberty or placed under the authority of a tutor