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Phase II trial of vinorelbine and trastuzumab in patients with HER2-positive metastatic breast cancer. A prospective, open label, non-controlled, multicenter phase II trial (to investigate efficacy and safety of this combination chemotherapy)

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Summary

The purpose of this study was to evaluate the efficacy (progression free survival (PFS) and response rate) and safety of vinorelbine and trastuzumab combination chemotherapy in patients with HER2-overexpressing, metastatic breast cancer as a first line chemotherapy regimen. Patients with histologically confirmed, HER2-positive (immunohistochemistry (ICH) 3+, or 2+ and FISH+) metastatic breast cancer who had nor received prior vinorelbine or anti-HER2 therapy in the adjuvant setting, received at least eight weeks of vinorelbine i.v. (25 mg/g weekly) and trastuzumab (4 mg/kg on day 1 followed by 2 mg/kg weekly). Forty-one women from six participating centers were enrolled into the trial. The overall response rate, was 43.9% (18 of 41 patients), (CI 28–60.3%), 30% of patients were progression free after 1 year. Four patients reached complete remission, 14 partial remission and five had stable disease for at least 18 weeks. Six patients developed primary progression. 35 patients (85%) experienced progression after a median time of 235 days. Therapy was in general well-tolerated. There were two CTC grade 4 infusion syndromes and two patients experienced cardiotoxicity at least grade 2. This phase II trial of vinorelbine and trastuzumab demonstrated an effective and well-tolerated regimen with a favourable safety profile.

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Acknowledgments

We thank all participating patients and attending medical staff in the different centers, Klaus Pahnke, Büro für Statistik, Reinheim, Germany for statistical analyses and the monitors of GSO-Gesellschaft für Studienmanagement und Onkologie mbH, Hamburg, Germany. Financial support was provided by Pierre Fabre Pharma GmbH, Freiburg, Germany and Hoffmann-La Roche AG, Grenzach-Wyhlen, Germany.

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Schilling, G., Bruweleit, M., Harbeck, N. et al. Phase II trial of vinorelbine and trastuzumab in patients with HER2-positive metastatic breast cancer. A prospective, open label, non-controlled, multicenter phase II trial (to investigate efficacy and safety of this combination chemotherapy). Invest New Drugs 27, 166–172 (2009). https://doi.org/10.1007/s10637-008-9166-8

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  • DOI: https://doi.org/10.1007/s10637-008-9166-8

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