AstraZeneca and Daiichi Sankyo Company, Limited (Daiichi Sankyo) today announced that the US Food and Drug Administration (FDA) has approved Enhertu (fam-trastuzumab deruxtecan-nxki) for the treatment of adult patients with unresectable or metastatic HER2-positive breast cancer who have received two or more prior anti-HER2 based regimens in the metastatic setting.