ABSTRACT
Targeted therapy characterized with high specificity and low toxicity, is an important treatment method for human epidermal growth factor receptor 2 (HER2)-positive breast cancer, which can prolong the disease-free survival and the overall survival time of HER2-positive early breast cancer patients, and prolong the progression-free survival and the overall survival time of HER2-positive advanced patients with breast cancer. However, targeted drugs blocked the normal signaling pathway outside the target organs, and some patients experienced treatment-related adverse reactions, resulting in dose reduction, treatment delay and interruption, or even life-threatening consequences. Cardiotoxicity is one of the potentially serious side effects of targeted-HER2 drugs. Currently the targeted drugs for treatment of HER2-positive breast cancer patients include macromolecular monoclonal antibody drugs such as trastuzumab and pertuzumab, antibody-drug conjugates such as T-DM1 and T-DXd, and small-molecule tyrosine kinase inhibitors. This paper reviews the cardiotoxicity of HER2 targeted drugs including antibody-drug conjugates monoclonal antibody drugs in targeted therapy for breast cancer in order to provide references for clinical treatment.