Cohort Study: Modelling Toxicity Processing in Patients Treated by Immunotherapy (MOTIVATE).

Inclusion Criteria: 1. Age \> or = 18 years old 2. Patient with a solid tumor whatever the organ 3. Patient receiving an Immune Checkpoint Inhibitor treatment 4. Patient starting first cycle of Immune Checkpoint Inhibitor treatment whatever the treatment line 5. Patient affiliated to the french social security system 6. Patient must provide written informed consent prior to inclusion in the study and any study-specific procedure Exclusion Criteria: 1. Patient who must receive a treatment other than Immune Checkpoint Inhibitor 2. Patient with contraindication to the use of a checkpoint inhibitor (e.g., auto immune disorders requiring an immunosuppressive therapy) 3. Pregnant or breastfeeding women 4. Any psychological, familial, geographical or sociological condition potentially preventing the medical follow-up and/or study procedures 5. Patient protected by law