Cardiac Safety and Efficacy for Early-stage Breast Cancer Patients Treated With Pegylated Liposomal Doxorubicin（PLD)

Subjects will receive one of two treatment regimens: Group A: intravenous infusion of pegylated liposomal doxorubicin（PLD） 35 mg/m2, d1; cyclophosphamide 600 mg/m2, intravenous infusion, d1; once every 21days, for 4 cycles. Sequential docetaxel 100 mg/m2, intravenous infusion, d1, or paclitaxel 80mg/m2,intravenous infusion, d1,8,15, once every 21 days, for 4 cycles. Group B: intravenous infusion of doxorubicin 60 mg/m2, d1; cyclophosphamide 600 mg/m2, intravenous infusion, d1; sequential docetaxel 100 mg/m2, intravenous infusion, d1, or paclitaxel 80mg/m2,intravenous infusion, d1,8,15, once every 21days, for 4 cycles. The primary endpoint is cardiotoxity,the secondary endpoint is 5-year disease-free survival (DFS), 5-year overall survival (OS), and safety: hematology and non hematological toxicity.