A nano-graphene oxide (nGO) was conjugated with anti-HER2 antibody (trastuzumab) and radiolabeled with indium111 as well as a metal-ion chelator to improve the imaging action against HER2-overexpressed human breast cancer cells in comparison to the radiolabeled trastuzumab without nGO [121]. Here, ERBB2 is linked to breast carcinoma.