Intraperitoneal cisplatin chemotherapy versus abdominopelvic irradiation in ovarian carcinoma patients after second-look laparotomy.

The current study compares the outcome within 3 years after diagnosis in two groups of histologically confirmed Stage II-IV ovarian carcinoma patients in complete clinical remission with minimal or no residual disease at second-look laparotomy, performed after completion of cisplatin-based combination chemotherapy. One group (n = 18) received after reexploration abdominopelvic irradiation (RT group), the other, diagnosed during a later period (n = 19), received three courses of intraperitoneal cisplatin chemotherapy with systemic thiosulfate protection (IP group). The two groups were comparable with regard to age, stage at diagnosis, histologic category, grade of differentiation, size of residual tumor after the initial operation, and rate of negative second-look laparotomy. The overall survival probability after diagnosis was significantly better in the IP group, the maximal difference being observed at 36 months: 76.6% versus 44.4% in the RT group (P = 0.04). This difference was mainly evident in patients with a negative second-look laparotomy in whom the respective survival probabilities were 100% versus 70% (P = 0.04). Survival was significantly shorter (P less than 0.01) in patients with a positive second-look, and there was a nonsignificant trend for better survival in the IP group. Significantly improved probability of progression-free interval after diagnosis was also found in the IP group, the maximal difference being observed at 22 months: 78.3% as compared to 50.9% in the RT group (P = 0.04). This difference was again limited to patients with negative second-look, the respective values being 100% versus 60% (P = 0.05). Our retrospective data suggest an apparent advantage to intraperitoneal cisplatin treatment in these patients which should be further explored for definite evaluation.