A bispecific monoclonal antibody directed against the human epidermal growth factor receptors ErbB2 (Her2) and ErbB3 (Her3) with potential antineoplastic activity. The anti-ErB2 targeting arm of anti-ErbB2/anti-ErbB3 bispecific monoclonal antibody MM-111 binds to ErbB2 on tumor cells with high affinity while the anti-Erb3 therapeutic arm binds to ErbB3, which may result in the inhibition of cellular proliferation and differentiation in ErbB2-overexpressing tumor cells via inhibition of ErbB3-dependent signal transduction pathways. ErbB2 and ErB3 are members of the epidermal growth factor receptor (EGFR) family of receptor tyrosine kinases and are frequently overexpressed in solid tumors. Check for active clinical trials using this agent. (NCI Thesaurus)
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