Prognosis of women with metastatic breast cancer by HER2 status and trastuzumab treatment: an institutional-based review
Autor: | Aman U. Buzdar, Gabriel N. Hortobagyi, Shaheenah Dawood, Kristine Broglio, Sharon H. Giordano |
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Rok vydání: | 2009 |
Předmět: |
Oncology
Adult Cancer Research medicine.medical_specialty Receptor ErbB-2 Antineoplastic Agents Breast Neoplasms Antibodies Monoclonal Humanized chemistry.chemical_compound Breast cancer Trastuzumab Internal medicine Original Reports medicine Humans Neoplasm Metastasis skin and connective tissue diseases neoplasms Aged Proportional Hazards Models Retrospective Studies Aged 80 and over business.industry Proportional hazards model Hazard ratio Cancer Antibodies Monoclonal Middle Aged medicine.disease Prognosis Metastatic breast cancer chemistry Trastuzumab emtansine Immunology Multivariate Analysis Female Breast disease business medicine.drug |
Zdroj: | Journal of clinical oncology : official journal of the American Society of Clinical Oncology. 28(1) |
ISSN: | 1527-7755 |
Popis: | Purpose The purpose of this study was to determine whether trastuzumab improves prognosis of women with metastatic human epidermal growth factor receptor 2 (HER2)/neu –positive breast cancer beyond that of women with HER2/neu-negative disease. Patients and Methods Two thousand ninety-one women with metastatic breast cancer diagnosed from 1991 to 2007, with known HER2/neu status and who had not received trastuzumab in the adjuvant setting, were identified. Disease was classified into the following three groups: HER2/neu negative, HER2/neu positive without first-line trastuzumab treatment, and HER2/neu positive with first-line trastuzumab treatment. Overall survival (OS) was estimated using the Kaplan-Meier product-limit method and compared between groups with the log-rank test. Cox proportional hazards models were used to determine associations between OS and HER2/neu status after controlling for patient characteristics. Results One hundred eighteen patients (5.6%) had HER2/neu-positive disease without trastuzumab treatment, 191 (9.1%) had HER2/neu-positive disease and received trastuzumab treatment, and 1,782 (85.3%) had HER2/neu-negative disease. Median-follow-up was 16.9 months. One-year survival rates among patients with HER2/neu-negative disease, HER2/neu-positive disease and trastuzumab treatment, and HER2/neu-positive disease and no trastuzumab treatment were 75.1% (95% CI, 72.9% to 77.2%), 86.6% (95% CI, 80.8% to 90.8%), and 70.2% (95% CI, 60.3% to 78.1%), respectively. In a multivariable model, women with HER2/neu-positive disease who received trastuzumab had a 44% reduction in the risk of death compared with women with HER2/neu-negative disease (hazard ratio [HR] = 0.56; 95% CI, 0.45 to 0.69; P < .0001). This HR varied with time and was significant for the first 24 months and not significant after 24 months. Conclusion Our results show that women with HER2/neu-positive disease who received trastuzumab had improved prognosis compared with women with HER2/neu-negative disease. |
Databáze: | OpenAIRE |
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