PLK1 and neoplasm: In one study, dendrimers conjugated with epidermal growth factor (EGF), human serum albumin (HSA) and nimotuzumab antibody (h-R3) were used to deliver siRNA against polo-like kinase-1 (PLK1) to the EGFR-overexpressing hepatocellular carcinoma cell line (HepG2) and tumor-bearing BALB/c nude mice.