Epidermal growth factor receptor (EGFR), also known as Proto-oncogene c-ErbB-1, Receptor tyrosine-protein kinase erbB-1 or HER-1, is an integral cell membrane protein which spans the membranes of a wide range of normal and malignant epithelial cells. EGFR is a tyrosine-specific protein kinase domain, it has an extracellular region which binds EGF and an intra-cellular carboxy-terminal region which possesses the tyrosine kinase activity. EGF binding to its specific EGFR, results in an increased DNA synthesis initiating a signaling cascades including cell proliferation, differentiation and repair of damaged epithelial tissue.