Definition

A human bispecific immunoglobulin G1 (IgG1) antibody targeting the tumor-associated antigens (TAAs) epidermal growth factor receptor (EGFR) and hepatocyte growth factor receptor (HGFR; c-Met), with potential antineoplastic activity. Upon administration, anti-EGFR/c-Met bispecific antibody MCLA-129 simultaneously targets and binds to the extracellular domains of both EGFR and c-Met expressed on cancer cells. This prevents the activation of both EGFR- and c-Met-mediated signaling pathways. The binding results in antibody-dependent cellular cytotoxicity (ADCC), thereby inhibiting tumor cell proliferation and survival. EGFR and c-Met, both upregulated or mutated in a variety of tumor cell types, play key roles in tumor cell proliferation.