Tumor angiogenesis is a research area that focuses on the formation of new blood vessels to support the growth and spread of tumors. Tumors require a blood supply in order to grow beyond a certain size, and angiogenesis is the process by which tumors stimulate the growth of new blood vessels to provide nutrients and oxygen. Understanding the mechanisms of tumor angiogenesis is important for the development of new anti-cancer therapies that target the blood vessels feeding the tumor. This area of research has led to the development of drugs that specifically inhibit angiogenesis, such as anti-angiogenic therapies which have shown promise in treating various types of cancers.