Phase III Trial of Doxorubicin Plus Cisplatin With or Without Paclitaxel Plus Filgrastim in Advanced Endometrial Carcinoma: A Gynecologic Oncology Group Study

Abstract

Purpose To determine whether the addition of paclitaxel to doxorubicin plus cisplatin improves overall survival (OS) in women with advanced or recurrent endometrial carcinoma. Secondary comparisons included progression-free survival (PFS), response rate (RR), and toxicities. Patients and Methods Eligible, consenting patients received doxorubicin 60 mg/m2 and cisplatin 50 mg/m2 (AP), or doxorubicin 45 mg/m2 and cisplatin 50 mg/m2 (day 1), followed by paclitaxel 160 mg/m2 (day 2) with filgrastim support (TAP). The initial doxorubicin dose in the AP arm was reduced to 45 mg/m2 in patients with prior pelvic radiotherapy and those older than 65 years. Both regimens were repeated every 3 weeks to a maximum of seven cycles. Patients completed a neurotoxicity questionnaire before each cycle. Results Two hundred seventy-three women (10 ineligible) were registered. Objective response (57% v 34%; P < .01), PFS (median, 8.3 v 5.3 months; P < .01), and OS (median, 15.3 v 12.3 months; P = .037) were improved with TAP. Treatment was hematologically well tolerated, with only 2% of patients receiving AP, and 3% of patients receiving TAP experiencing neutropenic fever. Neurologic toxicity was worse for those receiving TAP, with 12% grade 3, and 27% grade 2 peripheral neuropathy, compared with 1% and 4%, respectively, in those receiving AP. Patient-reported neurotoxicity was significantly higher in the TAP arm following two cycles of therapy. Conclusion TAP significantly improves RR, PFS, and OS compared with AP. Evaluation of this regimen in the high-risk adjuvant setting is warranted, but close attention should be paid to the increased risk of peripheral neuropathy.