EGFR is a transmembrane protein receptor for members of EGF family (Epidermal Growth Factor family) of extracellular protein ligands; EGFR is a member of ErbB family of receptors which includes EGFR (ErbB1), HER2 (ErbB2), HER3, HER4. Anti-tumor agents, including Dacomitinib (Product code : D5450), have been developed as a result of extensive studies of ligand binding to various ErbB receptors.