Final results of a phase II study of paclitaxel, bevacizumab, and gemcitabine as first-line therapy for patients with HER2-negative metastatic breast cancer

ABSTRACT

Background. Efficacy and safety data for combining bevacizumab, gemcitabine, and paclitaxel for locally advanced/metastatic breast cancer are limited. Patients and methods. AVALUZ trial evaluates the combination of bevacizumab 10 mg/kg, gemcitabine 2,000 mg/m2 plus paclitaxel 150 mg/m2, on days 1 and 15 of each 28-day course in previously untreated HER-2 negative patients. Results. Median progression-free survival (PES) 12.3 months. The overall response and clinical benefit rate (CR + PR + SD) were 72 % (95 % CI 60.9–82.0 %) and 89 % (95 % CI 80.3–95.3 %), respectively. Median overall survival 27.4 mo. Baseline circulating tumor cell (CTCs) ≥2 versus CTCs <2 was associated with lower PFS, p = 0.046. Overall response was significantly greater in patients with intense angiotensin type 1 receptor (AGTR1) expression (99 vs. 60 % [p = 0.021]). The most frequent grade 3/4 adverse events were neutropenia (10 %); febrile neutropenia (1 %); sensory neuropathy (13 %); and asthenia (6 %). Grade 3 adverse events of interest with bevacizumab included bleeding (1 %) and hypertension (4 %). One patient developed cardiac ischemia (1 %). Conclusions. Adding bevacizumab to chemotherapy appeared feasible and well tolerated, producing toxicity comparable to other effective combined first-line regimens. Baseline circulating endothelial cells and AGTR1 expression are predictive of PFS and response (AU)

RESUMEN

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