A monoclonal antibody used to treat certain types of head and neck cancer, and colorectal cancer that has spread to other parts of the body. It is also being studied in the treatment of other types of cancer. Monoclonal antibodies are made in the laboratory and can locate and bind to cancer cells. Cetuximab binds to the epidermal growth factor receptor (EGFR), which is found on the surface of some types of cancer cells. Also called Erbitux.