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Phase 3 Randomized Low-Dose Paclitaxel Chemoradiotherapy Study for Locally Advanced Non-Small Cell Lung Cancer
Hongmei Lin1, Yuhchyau Chen2, Anhui Shi3
1Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing, China; Department of Radiation Oncology, China-Japan Friendship Hospital, Beijing, China.
Introduction:
Concurrent chemoradiotherapy (CCRT) is the standard treatment for locally advanced non-small cell lung cancer (LA-NSCLC) but is associated with poor chest tumor control. Here, we report results of a randomized phase 3 study comparing two CCRT regimens in improving chest tumor control by low-dose paclitaxel chemoradiation for LA-NSCLC.
Methods:
Due to the logistics of local referral pattern, the study was designed to enroll patients with stage III LA-NSCLC who had completed 2-4 cycles of full-dose chemotherapy. One hundred thirty four were randomized to either Arm 1 [paclitaxel at 15 mg/m2, three times per week (Monday, Wednesday, and Friday) for 6 weeks, n = 74] or Arm 2 (weekly paclitaxel at 45 mg/m2 for 6 weeks, n = 60). Chest radiotherapy was 60-70 Gy in standard fractionation. Response rate was the primary endpoint, with recurrence-free survival (RFS) as the secondary endpoint.
Results:
From March 2006 to February 2013, 71 patients completed Arm 1 treatment and 59 completed Arm 2 treatment. The response rate for Arm 1 was significantly higher (83.1%) than Arm 2 (54.2%) (p=0.001). RFS was superior in Arm 1: median 14.6 vs. 9.4 months, p = 0.005, Hazard ratio (HR) 1.87 [95% confidence interval (CI) 1.20, 2.90]. Overall survival was not significantly different: median 32.6 months in Arm 1 vs. 31.3 months in Arm 2, p = 0.91, HR 0.97 (95% CI 0.55, 1.70). Toxicity was significantly lower in Arm 1 for Grade 3 and 4 leukopenia/neutropenia (p < 0.001).
Conclusion:
Pulsed low-dose paclitaxel CCRT resulted in significantly better RFS and tumor response rate, and less hematologic toxicities than weekly CCRT for LA-NSCLC.
