The impact of adjuvant platinum-based chemotherapy in early adult granulosa cell tumor of the ovaries: A meta-analysis of comparative studies.

Abstract

5547 Background: Adult granulosa cell tumors (AGCT) are the most common type of malignant ovarian sex chord stromal tumors but only comprise 2 to 5 percent of all malignant ovarian neoplasms. Most granulosa cell tumors have an indolent growth pattern, and prognosis depends on the disease stage at diagnosis and the presence of residual disease after surgery. Though these tumors have metastatic potential, their tendency for late relapses is well documented. Despite the lack of supporting data, the National Cancer Centers Network recommends platinum-based adjuvant chemotherapy (AC) for Stage I with intermediate and high-risk features. Most studies have failed to show any benefit of AC with disease-free or overall survival. However, several of these studies were small, and some had short median follow-ups. Others included advanced stages and the juvenile variant of the disease. Therefore, we conducted this meta-analysis to evaluate the impact of AC on disease recurrence in a stage I enriched AGCT. Methods: A review of the medical literature was conducted using online databases. Inclusion criteria consisted of English language, diagnosis of AGCT, studies with a preponderance of stage I, comparative studies of AC versus none, and studies that reported recurrence rates. Studies that had a preponderance of advanced stages or juvenile variants were excluded. A meta-analysis using the fixed effects and random effects models was conducted. Results: Seven retrospective comparative studies with a total of 500 patients were included. The average median age was 47 years, and the average median follow-up was 58 months. Approximately 79% of the sample were stage I, and 79% of stage I were IC. Most AC regimens used were BEP and EP, though it varied among the regions. Platinum-based AC in early-stage AGCT failed to impact recurrence rates compared to clinical observation (HR=1.39, 95%CI 0.86-2.25, I2=48%, p=0.18). Conclusions: This is the first meta-analysis to show that adding platinum-based adjuvant chemotherapy to surgery does not improve the recurrence rate in early AGCT. Therefore, in the absence of evidence supporting any benefit of AC in this disease, recommendations to use AC should be re-evaluated, especially since the risk of platinum-based AC with or without Bleomycin is well-documented and carry potentially serious side effects.