Abstract
Clinical studies have shown that trastuzumab combined with chemotherapy can significantly improve survival in treatment of HER2-positive metastatic breast cancer as well as in the neoadjuvant and adjuvant therapy for HER2-positive early breast cancer. In patients with HER2-positive and hormone receptor-positive metastatic breast cancer, adding trastuzumab to endocrine therapy improves treatment efficacy. Resistance to trastuzumab may be reversed by incorporating other targeted therapeutic drugs. Patients can still benefit from continuing trastuzumab after their disease progresses. Key words: Breast neoplasms; Receptor,epidermal growth factor
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