Primary Outcome: l 3-year overall survival The proportion of patients alive at 3 years after entry into the study [Time Frame: Participants will be followed for at least 3 years after randomization] Secondary Outcomes: l Overall survival The time from date of randomization until the date of death from any cause [Time Frame: Participants will be followed for at least 3 years after randomization] l Progression free survival The time from date of randomization until the diagnosis of the first progression or recurrence or death, whichever occurs first [Time Frame: Participants will be followed for at least 3 years after randomization] l Post-operative complications The surgical complications will be evaluated 30-day, 60-day and 90-day after upfront cytoreductive surgery or interval debulking surgery [Time Frame: Participants will be followed up to 3 months after randomization] l Quality of life assessments QLQ-C30, FACT-Q (baseline; 6 months, 12 months, 24 months and 36 months after randomization) [Time Frame: Participants will be followed for at least 3 years after randomization] l Accumulated treatment-free survival Time from the date of randomization to death from any reason, minus the total treatment time of surgery and chemotherapy after randomization (regardless of targeted therapy) [Time Frame: Participants will be followed for at least 3 years after randomization] l TFST Time from the date of randomization until the starting date of the first subsequent anticancer therapy or death, whichever occurred first, whichever occurred first [Time Frame: Participants will be followed for at least 3 years after randomization] l TSST Time from the date of randomization until the starting date of the second subsequent anticancer therapy or death, whichever occurred first [Time Frame: Participants will be followed for at least 3 years after randomization] l Patterns of the 1st recurrence The number and sites of the 1st relapse, including pelvic, abdominal, retroperitoneal lymph nodes, distant metastases and ascites will be compared between the two groups. [Time Frame: Participants will be followed for at least 3 years after randomization] |