Intraoperative Hyperthermic Intraperitoneal Chemotherapy With Ovarian Cancer

If a patient is allocated to operation to remove ovarian cancer and metastatic disease in the abdomen, this trial could be considered. Before operation, laboratory test results, image result, patient's medical history, and baseline quality of life will be checked and reviewed. When optimal cytoreduction (residual tumor\<1cm) is attained, this HIPEC (hyperthermic intraperitoneal chemotherapy) could be considered. For the primary advanced epithelial ovarian cancer, HIPEC will be performed at random. For the recurrent ovarian cancer, HIPEC will be performed after completion of cytoreductive procedures. Usually, HIPEC takes one and half hours after cytoreductive surgery. After cytoreductive surgery followed by HIPEC, adjuvant chemotherapy will be added. The cycle of chemotherapy will be determined according to the patients' clinical outcomes. The laboratory test results, image result, patient's medical history, and baseline quality of life will be checked after the operation, during chemotherapy, and after chemotherapy. Cytoreduction: an operation to remove ovarian cancer and its metastatic disease There will be an interim analysis when 50% of patients are enrolled. At the interim analysis, a statistical test will be performed. The nominal significance levels will be determined later. The exact nominal significance level will be determined based on the exact number of events at the time of the interim analysis. The Stopping boundaries will be calculated using an O'Brien-Fleming error spending function