NCIt definition : An immunoglobulin G (IgG) bispecific antibody targeting both the epidermal growth
factor receptor (EGFR; HER1; ErbB1) and the epidermal growth factor receptor 3 (HER3;
ErbB3), with potential antineoplastic activity. Upon administration, izalontamab simultaneously
targets and binds to EGFR and HER3 expressed on cancer cells, thereby preventing receptor
phosphorylation. This prevents the activation of both EGFR- and HER3-mediated signaling
pathways and results in the inhibition of tumor cell proliferation. EGFR and HER3,
both upregulated and/or mutated in a variety of tumor cell types, play key roles in
tumor cell proliferation.;