Unravelling Tumour Biology In Ovarian Cancer With Precision Imaging

Inclusion Criteria: * Patient aged \>18 * Pathologically proven HGSOC at an advanced stage (FIGO IIIB or IIIC) which can benefit from surgery with or without prior neoadjuvant treatment * Willingness and ability to comply with planned visits, treatment plan, laboratory tests and other study procedures, * Patient who has given informed, written and express consent, * Patient affiliated with a French health insurance scheme. Exclusion Criteria: * Early-stage disease (FIGO \<IIIB) or presence of extraperitoneal metastases, * Patient who will not have surgery * Patient whose regular follow-up is impossible for psychological, family, social or geographical reasons, * Patient under guardianship, curatorship or safeguarding of justice, * Pregnant and/or nursing patient, * Patient with a history of other cancers within 5 years/10 years prior to inclusion