Angiogenesis inhibitors have evolved as a new diverse class of compounds that can be used to block tumor growth (1,2). The inhibitors, which may be natural or synthetic, include protease inhibitors (i.e., tissue inhibitors of matrix metalloproteinases), tyrosine kinase inhibitors, chemokines, interleukins, and proteolytic fragments of diverse molecules (i.e., endostatin, vasostatin, canstatin, ...
