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分子靶向治疗具有特异性强、效果显著、不良反应小等特点，现已成为人表皮生长因子受体2（HER－2）阳性乳腺癌治疗的重要手段。随着抗 HER－2靶向药物的不断研发，尤其是帕妥珠单抗、T－DM1药物的应用以及靶向药物联合其他药物间进行的研究，极大提高了 HER－2阳性晚期乳腺癌的疗效，这使HER－2阳性乳腺癌的一线、二线及三线的治疗选择发生了改变。“,”Molecular targeted therapy with the characteristics of high specificity ,significant effect and lit-tle adverse reaction, has become the important treatment for human epidermal growth factor receptor-2 (HER-2) positive breast cancer.With the continuous research and development of HER-2 targeted drugs, especially the application of pertuzumab and T-DM1 drug and combination of targeted drugs and other drugs, the therapeutic effect of human HER-2 positive advanced breast cancer has been greatly improved, which changes the first line,second line and three line treatment methods for HER-2 positive breast cancer.