Other groups targeted breast cancer xenografts using whole antibodies radiolabeled with 131I and have reported MTD ranging from 7.4 MBq for the 131I-labeled anti-Lewis Y hu3S193 antibody [28] to 44.4 MBq for the 131I-labeled anti-MUC-1 Mc5 antibody [29]. The gene discussed is MUC1; the disease is breast cancer.