Preclinical and clinical studies using α-emitters have been ongoing for a variety of cancers, some of which include recurrent brain tumors, recurrent ovarian cancers, human epidermal growth factor receptor-2 (HER-2) positive cancers, myelogenous leukemia, non-Hodgkin lymphoma, metastatic melanoma, and skeletal metastases in prostate cancer [6]. Here, ERBB2 is linked to cancer.