Is adjuvant chemotherapy beneficial for surgical stage I ovarian clear cell carcinoma

Objective To assess the impact of adjuvant chemotherapy on survival in patients with surgical stage I ovarian clear cell carcinoma (OCCC). Methods. Data collection and analysis of surgical stage I OCCC patients treated at two tertiary cancer centers was performed. Descriptive statistics, univariate and multivariable analyses and Kaplan-Meier survival probability estimates were completed. Results. Sixty stage I OCCC patients who underwent comprehensive surgical staging were identified. 29 patients received adjuvant chemotherapy and 31 did not. Median follow-up was 4.96 (0.4-16.4) years. The 5-year disease specific survival (DSS) was 84.2%: 95% for stage IA and 76% for stage IB + IC (p = 0.16). There were 11 disease specific deaths: 7 in the no adjuvant chemotherapy group (NACG) and 4 in the adjuvant chemotherapy group (ACG). 5-year DSS was 84.2%: 74% in NACG and 93% in ACG, (p = 0.13). Seventeen patients recurred: 11 in NACG and 6 in ACG (p = 02). None of the 21 patients with stage I known negative cytology recurred. 5-year PFS was 74%: 58% in NACG and 86% in ACG (p = 0.035). On univariate analysis, no-adjuvant chemotherapy and positive cytology were poor prognostic factors for PFS: HR = 236, p = 0.04 and HR = 3.1, p = 0.027, respectively. After adjusting for positive cytology, no-adjuvant chemotherapy was still found to significantly correlate with a worse PFS (HR = 4, p = 0.01). Conclusion. Our data supports the use of adjuvant chemotherapy for surgical stage I OCCC. As no patients in our cohort with surgical stage I known negative cytology recurred, more research on the benefit of adjuvant chemotherapy in this group is warranted. (C) 2017 Elsevier Inc. All rights reserved.