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乳腺癌是全球女性最常见的恶性肿瘤,病死率较高[1]。人表皮生长因子受体2(human epider-mal growth factor receptor 2,HER2)既是乳腺癌的预后因素,也是某些化疗和抗内分泌药物治疗反应的预测因素[2]。HER2阳性的乳腺癌恶性程度高,预后差[3]。为提高HER2检测的准确性与重复性,美国临床肿瘤学会/美国病理学会(American Society of Clinical Oncology/College of American Pa-thologists,ASCO/