Inclusion Criteria:  Women of legal age (≥ 18 years) With an ovarian cancer confirmed by anatomopathological analysis Operated in the gynecology department of the Strasbourg University Hospital between 2021 and 2024 Patients having given their agreement to participate in the present trial and to the constitution of the collection of biological samples  Exclusion criteria:  Chronic inflammatory disease (Lupus, rheumatoid arthritis, chronic inflammatory bowel disease, etc.) History of immunotherapy treatment (anti PDL1...) Previous appendixctomy for another reason Impossibility to give the patient informed information (subject in an emergency situation, difficulties in understanding, language barrier, altered cognitive abilities) Patient under legal protection or tutorship or curatorship. Pregnant patient, breastfeeding Persons deprived of liberty by judicial or administrative decision. Persons under forced psychiatric care.