A drug used to treat certain types of head and neck cancer, and a certain type of colorectal cancer that has spread to other parts of the body. It is also being studied in the treatment of other types of cancer. Erbitux binds to a protein called epidermal growth factor receptor (EGFR), which is on the surface of some types of cancer cells. This may stop cancer cells from growing. Erbitux is a type of monoclonal antibody. Also called cetuximab.