Consolidation radiotherapy after carboplatin-based chemotherapy in radically operated advanced ovarian cancer.

Objective: The aim of the study was to evaluate the effect of additional radiotherapy after chemotherapy on the relapse-free and overall survival rates of patients with advanced ovarian cancer.

Methods: Between 1985 and 1992 64 patients with radically operated ovarian cancers (4 stage IC, 2 stage II, 54 stage III, and 4 stage IV) were enrolled in a randomized study. Radical surgery comprised total abdominal hysterectomy and bilateral salpingo-oophorectomy, omentectomy, and pelvic and paraaortic lymphadenectomy. All patients received adjuvant chemotherapy with carboplatin IV 400 mg/m2, epirubicin IV 70 mg/m2 on day 1 and prednimustine orally 100 mg/m2 on days 3 to 7 at 1-month intervals. Thirty-two patients without residual disease were randomized to whole abdominal radiation (30 Gy, administered over 4 weeks). An additional 21.6 Gy were delivered to the pelvis and 12 Gy to the paraaortic region up to the diaphragm for total doses of 51.6 and 42 Gy, respectively. Cancer-related survival was calculated with the Kaplan-Meier and Cox proportional hazards methods.

Results: The relapse-free and overall survival rates of patients who received adjuvant chemoradiotherapy were significantly higher than those of patients who received adjuvant chemotherapy only (68% vs 56% at 2 years and 49% vs 26% at 5 years, P = 0.013, and 87% vs 61% at 2 years and 59% vs 33% at 5 years, P = 0.029). The differences were most pronounced in patients with stage III disease (77% vs 54% at 2 years and 45% vs 19% at 5 years, P = 0. 0061, and 88% vs 58% at 2 years and 59% vs 26% at 5 years, P = 0. 012). Toxicities were acceptable.

Conclusion: Sequential combination of platinum-based chemotherapy with open-field abdominal radiotherapy is a promising adjuvant regimen for patients with advanced ovarian cancer.