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Nimotuzumab Biosimilar uses the same protein sequences as the therapeutic antibody nimotuzumab. Like cetuximab, nimotuzumab is a humanized monoclonal antibody that binds to the epidermal growth factor receptor (EGFR), a signalling protein that normally controls cell division. In some cancers, this receptor is altered to cause uncontrolled cell division, a hallmark of cancer. These monoclonal antibodies block EGFR and stop the uncontrolled cell division. It has a humanized human-mouse h-R3 heavy chain and a humanized human-mouse h-R3 κ-chain. Nimotuzumab binds with optimal affinity and high specificity to the extracellular region of EGFR (epidermal growth factor receptor). This results in a blockade of ligand binding and receptor activation. Epidermal growth factor receptor (EGFR) is a key target in the development of cancer therapeutics. EGFR-targeting drugs have been shown to improve response when used with conventional treatments such as radiation therapy and chemotherapy.