ERBB2 and neoplasm: Gold nanostars conjugated with CD44v6 monoclonal antibodies (74), gold nanorods conjugated with anti-HER2 and -CXCR4 antibodies (71), and iron oxide nanoparticles conjugated with anti-HER2 antibodies (72) have been successfully used to image antigen overexpression due to their targeting-ability to specific tumor antigens.