Aim: Several previous reports showed that irinotecan hydrochloride plus cisplatin (CPT-P) was a candidate first-line chemotherapy regimen for clear cell adenocarcinoma of the ovary (CCC). However, long-term survival in CCC patients treated with CPT-P as first-line chemotherapy remains to be determined. The aim of the present study was to evaluate the long-term results of CPT-P as first-line chemotherapy for CCC.
Material and Methods: We performed a retrospective review of 31 patients with CCC who were treated with CPT-P between 1996 and 2004.
Results: The median follow-up period was 91 months. The estimated 8-year overall survival (OS) rate in all patients was 64.5%, while the rate in 18 stage I, 21 stage I/II, and 10 stage III/IV patients was 88.9%, 85.7%, and 20.0%, respectively. The estimated 8-year OS rate in patients with pT1/pT2 disease was 87.0%, while the 3-year OS rate in patients with pT3 disease was 0%. Univariate analysis using the log–rank test revealed that Eastern Cooperative Oncology Group performance-status 1, pT3 stage, and presence of residual disease (stage II-IV) were significantly correlated with shortened patient survival. Multiple regression analysis revealed that pT3 predicted worse OS in patients with CCC than pT1 (P < 0.001) or pT2 disease (P < 0.005).
Conclusion: The long-term results suggest CPT-P as a candidate in first-line chemotherapy for CCC in not only stage I, but also in optimally debulked stage II-IV patients with pT1/pT2 disease.