A phase II trial of trabectedin in triple-negative and HER2-overexpressing metastatic breast cancer
Breast Cancer Research and Treatment(2016)
摘要
Trabectedin is an alkylating agent that binds to the minor groove of DNA. Early studies with trabectedin suggested efficacy in triple-negative and HER2-overexpressing metastatic breast cancer (MBC). The efficacy and safety of trabectedin in pretreated patients with these tumors were evaluated in this parallel-cohort phase II trial. Patients received a 3-h infusion of trabectedin 1.3 mg/m 2 intravenously every 3 weeks until progression or unmanageable/unacceptable toxicity. The primary objective was to evaluate the efficacy using the objective response rate (ORR) as per Response Evaluation Criteria In Solid Tumors (RECIST). Secondary objectives comprised time-to-event endpoints and safety assessed with the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) v.3.0. Patients with heavily pretreated triple-negative ( n = 50) or HER2-overexpressing ( n = 37) MBC were enrolled. No confirmed responses were found in triple-negative MBC patients, with median progression-free survival (PFS) of 2.2 months (95 % CI 1.3–2.7 months). Confirmed partial responses occurred in 4 of 34 evaluable HER2-overexpressing MBC patients (ORR = 12 %; 95 % CI 3–27 %) and lasted a median of 12.5 months (95 % CI, 6.2–14.7 months); median PFS was 3.8 months (95 % CI, 1.8–5.5 months). Most trabectedin-related adverse events were mild or moderate, and the most frequent were fatigue, nausea, vomiting, constipation, and anorexia. Severe neutropenia and transaminase increases were non-cumulative and transient and were mostly managed by infusion delays or dose reductions. Single-agent trabectedin is well tolerated in aggressive MBC and has moderate activity in HER2-overexpressing tumors. Further studies are warranted to evaluate trabectedin combined with HER2-targeted treatments in this subtype.
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关键词
Trabectedin,Breast cancer,HER2,Triple negative
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