Daiichi Sankyo Company, Limited announced that the U.S. Food and Drug Administration (FDA) has granted Fast Track designation to its investigational HER2-targeting antibody drug conjugate DS-8201 for the treatment of HER2-positive unresectable and/or metastatic breast cancer in patients who have progressed after prior treatment with HER2-targeted therapies including ado-trastuzumab emtansine (T-DM1).

