Matuzumab (formerly EMD 72000) is a humanized monoclonal antibody for the treatment of cancer. It binds to the epidermal growth factor receptor (EGFR) with high affinity. The mouse monoclonal antibody (mAb425).
 Matuzumab binds to epidermal growth factor receptor (EGFR) on the outer membrane of normal and tumor cells. The matuzumab epitope has been mapped to domain III of the extracellular domain of the EGFR. The EGFR is receptor tyrosine kinase which binds multiple growth factors including EGF (epidermal growth factor) and other members of the EGF family of growth factors, resulting in activation of its tyrosine kinase activity. Activation of the EGFR has diverse effects on target cells depending on cell type and tissue context. It directs cell fate decision relating to cell growth, survival and, differentiation. Development of matuzumab and other antibodies to the EGFR (for example cetuximab) as cancer therapeutics was motivated by observations that EGFR expression and/or signaling is frequently upregulated in cancer cells.