Wiktionary
angiostatin
n. (context protein medicine English) A protein that inhibits angiogenesis; it is used to inhibit the growth of new blood vessels in tumours
Wikipedia
Angiostatin
Angiostatin is a naturally occurring protein found in several animal species, including humans. It is an endogenous angiogenesis inhibitor (i.e., it blocks the growth of new blood vessels), and it is currently undergoing clinical trials for its use in anticancer therapy.