By dynamically observing the changes of echocardiogram and biomarkers in breast cancer patients using trastuzumab, evaluate the effect of trastuzumab on cardiac function; determine the sensitivity of echocardiography and biomarker indicators And specificity, explore effective and specific early warning indicators, and provide technical support for the evaluation of the cardiac safety of anti-tumor drugs.

Thirty female breast cancer patients using trastuzumab, collected demographic and clinical information of all patients before chemotherapy, performed echocardiography (conventional echocardiography, three-dimensional spot tracking technology), and collected blood samples to detect plasma biology Markers (TnT, BNP, GDF-15, topoisomerase), follow-up echocardiography and biomarkers at 1 month, 3 months and 6 months after chemotherapy.

Inclusion Criteria:

• Patients with breast cancer (18-70 years old)
• Patients who are planning to undergo trastuzumab for the first time

Exclusion Criteria:

• Organic heart disease such as coronary heart disease, heart valve disease, cardiomyopathy
• liver and kidney failure
• severe cerebrovascular disease
• chronic obstructive pulmonary disease
• rheumatic immune system disease
• other tumors

30 female breast cancer patients using trastuzumab, collected demographic and clinical information of all patients before chemotherapy, performed echocardiography (conventional echocardiography, three-dimensional spot tracking technology), and collected blood samples to detect plasma biology Markers (TnT, BNP, GDF-15, topoisomerase)