INTRAPERITONEAL (IP) CISPLATIN (P) VERSUS NO FURTHER TREATMENT: 8 YEAR-RESULTS OF AN EORTCGCG RANDOMIZED PHASE III STUDY IN OVARIAN CANCER (O.C.) PATIENTS (PTS) WITH A PATHOLOGICALLY COMPLETE REMISSION (PCR) AFTER P-BASED INDUCTION CHEMOTHERAPY (CT) AND CYTOREDUCTIVE SURGERY