NCIt definition : An antibody mixture composed of six humanized, immunoglobulin G1 (IgG1) monoclonal
antibodies directed against three members of the human epidermal growth factor receptor
(EGFR; HER) family: EGFR (HER1; ErbB1), HER2 (ErbB2) and HER3 (ErbB3), with potential
antineoplastic activity. Upon administration of anti-EGFR/HER2/HER3 monoclonal antibody
mixture Sym013, the six antibodies bind to non-overlapping epitopes on EGFR, HER2
and HER3, which prevents both ligand binding and receptor activation, and induce simultaneous
down-modulation of EGFR, HER2 and HER3. This inhibits the activation of HER-dependent
signaling pathways and HER-dependent tumor cell proliferation. Overexpression of the
HER family plays a key role in many cancers; targeting multiple HER family members
simultaneously may increase therapeutic efficacy.;