vascular endothelial growth factor [also called VEGF]
(VASS-kyoo-lir en-do-THEE-lee-ul GROWTH FAK-tir)
A substance made by cells that causes new blood vessels to form.
Avastin (chemical name: bevacizumab) is a type of targeted therapy that blocks vascular endothelial growth factor. Read more about how Avastin works.
Audio contributed by: Al Roker
