Our secondary objectives are: 1/ To assess the interest of the detection of tissue-resident memory (TRM) T cells (CD8-CD103) as a predictive biomarker of response and survival at 1-year; 2/ To extend the panel of neoantigens published by Snyder et al to other neoantigens using a next-generation sequencing (NGS) approach on tumor samples obtained before therapy; 3/ To establish the prognostic value of this panel of neoantigens to predict tumor response to anti-PD1 and 1-year survival; 4/ To functionally validate the identified tumor neoantigens by stimulating patient PBMC with neoantigen peptides and measuring tumor-specific T-cell reactivity; 5/ To define the best marker and/or the best combination of markers predicting the overall response rate and the survival at 12 and 18 months; 6/ To attempt to establish a correlation between immuno-signature and neoepitopes and 7/ To transfer this immune signature in routine basis if validated.