Enhertu® (fam-trastuzumab deruxtecan-nxki), developed by Daichi Sankyo/AstraZeneca, was granted accelerated FDA approval in December 2019 for treatment of adult patients with unresectable or metastatic HER2+ breast cancer who have received two or more prior anti-HER2 based regimens [84,85]. The gene discussed is ERBB2; the disease is breast cancer.