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Chinese Journal of Clinicians(Electronic Edition) ›› 2023, Vol. 17 ›› Issue (07): 765-770. doi: 10.3877/cma.j.issn.1674-0785.2023.07.002

• Clinical Research • Previous Articles     Next Articles

HER2 protein expression levels predict efficacy of neoadjuvant therapy in breast cancer: A real-world study

Ruixue Yue, Lingxin Kong, Xin Hao, Jinqiang Yang, Meng Han, Guozhong Cui, Jianjun Wang, Zhisheng Zhang, Fanting Kong, Wei Zhang, Wenbo He, Xianqiao Li, Xinping Zhou, Donghong Xu, Chongzhu Hu()   

  1. The First Department of Breast Surgery, Baoding No.1 Central Hospital, Baoding 071000, China
    Department of Thoracic Surgery, Hebei General Hospital, Shijiazhuang 050000, China
    Department of Breast Surgery, the Affiliated Hospital of Hebei University, Baoding 071000, China
    Department of Glandular Vascular Surgery, Harrison International Peace Hospital, Hengshui 053000, China
    Breast Disease Center, the First Hospital of Qinhuangdao, Qinhuangdao 066000, China
    The Second Department of Thyroid Breast Surgery, Cangzhou Central Hospital, Cangzhou 061001, China
    Department of Breast Surgery, Hebei Petrochina Central Hospital, Langfang 065000, China
    Department of Breast Surgery, The First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, China
    Department of Breast Surgery, Xingtai People's Hospital, Xingtai 054001, China
    The First Department of Thyroid Breast Surgery, Cangzhou Central Hospital, Cangzhou 061001, China
    Department of Glandular Surgery, Dingzhou People's Hospital, Dingzhou 073000, China
    The First Department of Breast Surgery, The Affiliated Hospital of Hebei University of Engineering, Handan 056001, China
    Department of Breast Surgery, Handan Central Hospital, Handan 056001, China
  • Received:2023-02-13 Online:2023-07-15 Published:2023-09-01
  • Contact: Chongzhu Hu

Abstract:

Objective

To assess the value of human epidermal growth factor receptor 2 (HER2) protein expression levels in predicting the efficacy of trastuzumab plus pertuzumab (HP) as a basic neoadjuvant therapy for HER2-positive breast cancer patients, so as to provide a basis for the rational selection of HER2-targeted therapy mode.

Methods

The clinical data of HER2-positive breast cancer patients who received neoadjuvant therapy with trastuzumab plus pertuzumab chemotherapy and underwent subsequent surgery at 11 tertiary hospitals in Hebei Province, including Baoding No.1 Central Hospital,,were retrospectively collected to analyze the association between HER2 expression levels and clinicopathological characteristics and total pathological complete response (tpCR) rate.

Results

A total of 180 patients were enrolled, including 157 (87.2%) in the HER2 IHC3+ group and 23 (12.8%) in the HER2 IHC2+/FISH+ group. The tpCR rate in the HER2 IHC3+ group was significantly higher than that in the HER2 IHC2+/FISH+ group (65.0% vs 17.4%, P<0.001). The expression levels of HER2 protein were related to hormone receptor (HR) status, and the positive rate of HR in the HER2 IHC2+/FISH+ group was significantly higher than that in the HER2 IHC 3+ group (87.0% vs 49.7%, P=0.001), and the expression levels of HER2 protein had no correlation with age, menstrual status, tumor size, lymph node status, tumor clinical stage, or Ki-67 proliferation index.

Conclusion

The expression level of HER2 protein in breast cancer has appreciated predictive value for the efficacy of neoadjuvant therapy with trastuzumab and pertuzumab in combination with chemotherapy, and HER2 IHC2+ patients have poor efficacy. It is necessary to explore anti-HER2-targeted therapy mode which is suitable for HER2 IHC2+ patients.

Key words: Breast cancer, Neoadjuvant therapy, Human epidermal growth factor receptor 2, Immunohistochemistry, Fluorescence in situ hybridization

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