Objective: To investigate the curative effect of neoadjuvant chemotherapy under the scheme of epirubicin combined cyclophosphamide( EC) on different molecular subtypes of breast cancer. Methods: Analyzing 89 patients who accepted preoperative chemotherapy under the scheme of EC,testing the immunohistochemical expression levels of ER,PR,HER-2,EGFR and CK5 /6,then,the patients were divided into the type of Luminal A,the type of Luminal B,the type of HER-2( +),the type of basal-like and the type of normal brea...