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Randomized phase II study evaluating weekly oral vinorelbine versus weekly paclitaxel in estrogen receptor-positive, HER2-negative patients with advanced breast cancer (NorBreast-231 trial)

AuthorsAapro, Matti; Ruiz-Borrego, Manuel; Hegg, Roberto; Kukielka-Budny, Bozena; Morales, Serafin; Cinieri, Saverio; Freitas-Junior, Ruffo; García-Estévez, Laura; Szombara, Ewa; Santos Borges, Giuliano; Passalacqua, Rodolfo; Hervieu, Helene; Groc, Melanie; Villanova, Gustavo
KeywordsOral chemotherapy
Weekly paclitaxel
Issue Date2019
CitationBreast 45: 7-14 (2019)
Abstract[Background] Single-agent paclitaxel and vinorelbine are recommended treatments for advanced breast cancer (ABC) non-responsive to hormone therapy and without visceral crisis. This phase II trial compared first-line oral vinorelbine versus weekly paclitaxel for ABC. [Methods] Eligible female patients had measurable locally recurrent/metastatic estrogen receptor-positive HER2-negative breast cancer and had received prior endocrine therapy (any setting) but no chemotherapy for ABC. Patients were stratified by prior taxane and visceral metastases and randomized to either oral vinorelbine 80 mg/m2 (first cycle at 60 mg/m2, escalated to 80 mg/m2 in the absence of grade 3/4 toxicity) or intravenous paclitaxel 80 mg/m2 on days 1, 8, and 15 every 3 weeks until disease progression or unacceptable toxicity. The primary endpoint was disease control rate (DCR; confirmed complete or partial response, or stable disease for ≥6 weeks). [Results] The 131 randomized patients had received a median of 2 prior endocrine therapies; >70% had prior (neo)adjuvant chemotherapy and 79% visceral metastases. DCR was 75.8% (95% confidence interval: 63.6–85.5%) with vinorelbine and 75.4% (63.1–85.2%) with paclitaxel. The most common grade 3/4 adverse events were neutropenia (52%), fatigue (11%), and vomiting (5%) with vinorelbine, and neutropenia (17%), dyspnea (6%), hypertension (6%), and peripheral sensory neuropathy (5%) with paclitaxel. Grade 2 alopecia occurred in 2% of vinorelbine-treated and 34% of paclitaxel-treated patients. Neither arm showed relevant global health status changes. [Conclusion] Oral vinorelbine and paclitaxel demonstrated similar DCRs (∼75%). Safety profiles differed and, together with administration route and convenience, may influence treatment choice (EudraCT number, 2012-003530-16).
Publisher version (URL)https://doi.org/10.1016/j.breast.2019.01.009
Identifiersdoi: 10.1016/j.breast.2019.01.009
issn: 0960-9776
e-issn: 1532-3080
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