Trastuzumab and Vinorelbine as First-Line Therapy for HER2-Overexpressing Metastatic Breast Cancer: Multicenter Phase II Trial With Clinical Outcomes, Analysis of Serum Tumor Markers as Predictive Factors, and Cardiac Surveillance Algorithm

Abstract
Purpose: Trastuzumab-based therapy improves survival for women with human epidermal growth factor receptor 2 (HER2)–positive advanced breast cancer. We conducted a multicenter phase II study to evaluate the efficacy and safety of trastuzumab combined with vinorelbine, and to assess cardiac surveillance algorithms and tumor markers as prognostic tools.