Long-term survival in patients with clear cell adenocarcinoma of ovary treated with irinotecan hydrochloride plus cisplatin therapy as first-line chemotherapy

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