Cetuximab. Molecular model of the drug cetuximab. This monoclonal antibody, sold under the brand name Erbitux, is an epidermal growth factor receptor (EGFR) inhibitor used for the treatment of metastatic colorectal cancer, metastatic non-small cell lung cancer and head and neck cancer. The image shows the molecule with light chains (red, blue), heavy chains (green, yellow) and the cyclic linked meditope (violet).