Overview
Angiogenesis, the growth of new capillary blood vessels, is central to cancer growth and metastasis and is recognized to be a potential therapeutic target for the treatment of cancer. Antiangiogenic agents have become part of the standard treatment armamentarium for many solid tumors, providing significant clinical benefits for some cancers (e.g., renal cell, colorectal) and modest or no benefit for others. This article is focused on principles of tumor angiogenesis that are intrinsic to the behavior of human cancer, and lessons that can be gleaned from the clinical testing and use of angiogenesis inhibitors alone and in combination with other agents to date.