Management and clinical outcomes of patients with recurrent/progressive ovarian clear cell carcinoma

Background/purpose: Ovarian clear cell carcinoma (OCCC) with recurrence/progression after treatment has dismal prognosis. We aimed to investigate the management and outcomes of such patients. Methods: OCCC patients who were treated between 2000 and 2013 with cancer recurrence or progression after primary treatment were analyzed. Univariate and multivariate analyses were used to identify the independent predictors of survival after recurrence (SAR) and cancer-specific survival (CSS). Results: A total of 64 patients experienced treatment failure (49 recurred after remission and 15 progressed without remission). The 5-year CSS rates of recurrent/progressive OCCC patients were 22.9% (progression group: median CSS 5.9 months [range, 0.8-25.2] vs recurrence group: 43.6 months [range, 7.1-217.8]; p < 0.001). Patients with solitary recurrence had significantly better SAR than those with disseminated relapse (median: not reached vs 10.4 months, p < 0.001). On multivariate analysis, six models each for SAR and CSS were formulated alternatively including highly correlated variables for the recurrence group. Of these models, solitary relapse pattern (HR: 0.07, p < 0.001), progression-free interval (PFI) > 12 months (HR: 0.22-0.40, p = 0.001 and p = 0.023), CA125 < 35 U/mL at initial recurrence (HR: 0.32, p = 0.007), and overall salvage treatment including radiotherapy (HR: 0.19, p = 0.001) were significant predictors of favorable SAR. The same significant predictors were selected for CSS. Conclusion: Recurrent OCCC can be treated with curative intent if the relapse is solitary and can be completely resected or encompassed with radiotherapy, whereas novel therapies are needed for disseminated relapse or progression during primary treatment. Copyright (C) 2019, Formosan Medical Association. Published by Elsevier Taiwan LLC.