Role of Surgery in Advanced Ovarian Cancer

Primary objective : To demonstrate that ultra-radical surgery with multiple visceral resections and high tumor burden prior to surgery independently reduces the survival of patients with advanced ovarian cancer treated with complete cytoreductive surgery. Secondary objectives: 1. Demonstrate that, in patients with advanced ovarian cancer (FIGO stage IIIC-IVB) treated by complete cytoreduction surgery, the high tumor load before surgery decreases survival. / Evaluate whether there is a sub-group of patients at risk for whom the high tumor burden prior to surgery reduces survival. 2. Demonstrate that, in patients with advanced ovarian cancer (FIGO stage IIIC-IVB) treated by complete cytoreduction surgery, the extension of carcinomatosis to the upper abdomen reduces the chances of survival. / Assess whether there is a subgroup of patients at risk for whom the extension of carcinomatosis to the upper abdomen reduces survival. 3. Demonstrate that, in patients with advanced ovarian cancer (FIGO Stage IIIC-IVB) treated by complete cytoreduction surgery, invasion of the celiac lymph nodes reduces survival rates. / Assess whether there is a subset of patients at risk where the invasion of the celiac lymph nodes reduces survival. 4. Demonstrate that, in patients with advanced ovarian cancer (FIGO stage IIIC-IVB) treated with complete cytoreduction surgery, combination with surgical procedures reduces survival. / Evaluate whether there is a sub-group of at-risk patients for whom the combination of surgical procedures with ultra-radical surgery reduces survival.