A Randomized Phase III Trial of IV Carboplatin and Paclitaxel x 3 Courses Followed by Observation Versus Weekly Maintenance Low Dose Paclitaxel in Patients with Early Stage Ovarian Carcinoma: a Gynecologic Oncology Group Study

Abstract

Objective: To compare the recurrence-free interval (RFI) and safety profile in patients with completely resected high-risk early-stage ovarian cancer treated with intravenous (IV) carboplatin and paclitaxel with or without maintenance low-dose paclitaxel for 24 weeks. Methods: Eligibility was limited to patients with stage IA/B (grade 3 or clear cell), all IC or II epithelial ovarian cancer. All patients were to receive carboplatin AUC 6 and paclitaxel 175 mg/m² q3 weeks × 3 courses with random assignment to either observation or maintenance paclitaxel 40 mg/m²/week × 24 weeks. Recurrence required clinical or radiological evidence of new tumor. Results: There were 571 patients enrolled onto this study, of whom 29 were deemed ineligible due to inappropriate stage or pathology, leaving 542 patients. At least 3 cycles of treatment were administered to 524/542 (97%) of patients, and among those assigned to maintenance paclitaxel, 80% completed the regimen. The incidence of grade 2 or worse peripheral neuropathy (15.5% vs. 6%), infection/fever (19.9% vs. 8.7%), and dermatologic events (70.8% vs. 52.1%) was higher on the maintenance regimen (p<0.001). The cumulative probability of recurring within 5 years for the maintenance paclitaxel regimen is 20% vs. 23% for surveillance (hazard ratio 0.807; 95% CI: 0.565-1.15). The probability of surviving 5 years was 85.4% and 86.2%, respectively. Conclusion: Maintenance paclitaxel at 40 mg/m²/week × 24 weeks added to standard dose AUC6 and paclitaxel 175 mg/m² × 3 doses provides no significant increase in RFI.