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Baselga, J., et al.
http://www.nejm.org/doi/full/10.1056/NEJMoa1113216#t=article
The anti–human epidermal growth factor receptor 2 (HER2) humanized monoclonal antibody trastuzumab improves the outcome in patients with HER2-positive metastatic breast cancer. However, most cases of advanced disease eventually progress.