64Cu-labeled antibodies for PET imaging are trastuzumab (breast cancers expressing human epidermal growth factor receptor 2 or HER2), cetuximab (targeting EGFR-epidermal growth-factor receptor expressing tumors), TRC105-Fab (targeting CD105), and etaracizumab (antibody against human αvβ3 integrin) [4]. The gene discussed is ERBB2; the disease is breast cancer.