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Treatment of Advanced Breast Cancer with Vinorelbine and Docetaxel With or Without Human Granulocyte Colony-Stimulating Factor

From the Department of Internal Medicine I, Division of Oncology, Vienna University Medical School, Vienna; Department of Surgery, Wr Neustadt General Hospital, Neustadt; Department of Surgery, Baden General Hospital, Baden; Department of Surgery, Neunkirchen General Hospital, Neunkirchen; and Department Internal Medicine, Kirchdorf General Hospital, Kirchdorf/Krems, Austria.

Address reprint requests to Univ Prof Dr Gabriela V. Kornek, Department of Internal Medicine I, Division of Oncology, Vienna University Medical School, Waehringer Guertel 18-20, A-1090 Vienna; email: werner.scheithauer{at}akh-wien.ac.at

PURPOSE: A multicenter phase II trial was performed to investigate the efficacy and tolerance of docetaxel, vinorelbine with or without recombinant human granulocyte colony-stimulating factor (G-CSF) in patients with metastatic breast cancer.

PATIENTS AND METHODS: Between February 1998 and March 1999, 57 patients participated in this trial. Forty-two patients received this combination as first-line and 15 patients as second-line chemotherapy, including 10 patients who had failed anthracyclines. Therapy consisted of vinorelbine 30 mg/m² on days 1 and 15 and docetaxel 30 mg/m² on days 1, 8, and 15 every 4 weeks. Depending on the absolute neutrophil counts on the day of scheduled chemotherapeutic drug administration, a 5-day course of G-CSF 5 µg/kg/d was given.

RESULTS: The overall response rate was 64.3% (95% confidence interval, 48.1% to 78.4%) in patients receiving docetaxel plus vinorelbine as first-line chemotherapy, including eight complete (19%) and 19 partial remissions (45.3%); 11 patients (26.2%) had disease stabilization, and only four (9.5%) progressed. Second-line treatment with this regimen resulted in eight (53.3%) of 15 objective responses, four had stable disease, and three had progressive disease. The median time to progression was 12 months in the first-line and 9.8 months in the second-line setting, respectively. After a median follow-up time of 18 months, 38 patients (65%) were still alive with metastatic disease. Myelosuppression was commonly observed; World Health Organization grade 3 or 4 neutropenia both occurred in 18 patients (32%) and was complicated by septicemia in four cases; grade 3 or 4 thrombocytopenia was seen in two patients (4%), and grade 3 anemia was seen in only one patient (2%). Severe (grade 3) nonhematologic toxicity, except for alopecia, was rarely observed and included nausea/vomiting in two patients (4%), and stomatitis, peripheral neuropathy, and skin toxicity each in one patient.

CONCLUSION: Our data suggest that docetaxel and vinorelbine with or without G-CSF is an effective and fairly well tolerated regimen for the treatment of advanced breast cancer. It might be particularly useful in patients previously exposed to adjuvant or palliative anthracyclines and/or alkylating agents.

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