Ephrin receptor A2 (EphA2), also known as Eck, is a 130 kD type I transmembrane glycoprotein which belongs to the ephrin receptor subfamily of the protein-tyrosine kinase family. EphA2 is expressed on epithelial cells, keratinocytes, dendritic/Langerhans cells and melanocytes. It has also been observed in breast, cervical, ovarian, prostate, colon, skin and lung cancers. EphA2 is an oncoprotein which is an essential survival factor for many melanomas. EphA2 plays an important role in angiogenesis and tumor neovascularization through interaction with ephrin-A1, -A3, -A4 and -A5.