Angiogenesis is a complex process critical for embryonic development and for survival. It is
also a critical player in many pathologic processes, most notably in neoplasia. The cell
signaling pathways involved in angiogenesis have become key targets for drug design, with
more than 2,500 clinical trials currently under way. This review summarizes the essential
features of angiogenesis and discusses therapeutic strategies that have been applied to
specific diseases known to be associated with perturbation of normal angiogenic control.