Vascular endothelial growth factor (VEGF) is widely known as a key molecule in angiogenesis, and related to the pathogenesis and/or progression of several diseases such as cancer, rheumatoid arthritis (RA) and age-related macular degeneration (AMD). 1 In recent years, various types of VEGF inhibitors have been launched on the market. For example, Pegaptanib (Macugen) 2 is a VEGF trap, and has been applied for the treatment of AMD. ...