Pelvic and Aortic-cava Lymphadenectomy Randomized for Ovarian Cancer

Inclusion Criteria: * Age\> 18 years * Karnofsky\> 80, or ASA I-II * Primary ovarian adenocarcinoma, or primitive peritoneal * No retroperitoneal lymph node\> 2cm (CT; MRI) * Complete surgical staging * Stage III-IV FIGO classification * Indication of systemic chemotherapy before surgery or post surgery Exclusion Criteria: * Non Invasive Cancer * non-epithelial or borderline cancer * Pregnancy * Previous pelvic lymphadenectomy or aortic-cava for a disease other than ovarian cancer * Contraindication to Platinum and Paclitaxel * Borderline Ovarian Tumor * tumor recurrence * Incomplete surgery, resectable lesion, Surgery sub optimal (R\> 1cm)