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.
