Vascular endothelial growth factor. Is that something in cancer tumors?

Yes. Vascular endothelial growth factor (vegf) is a substance that cells produce which helps them recruit the growth of new blood vessels. Blood vessels are essential in bring normal cells and cancer cells the oxygen and nutrients they need to keep growing. The growth of some types of cancer can be slowed or controlled by blocking vegf.
And everywhere else. Wherever new tissue is growing, vegf guides the new blood vessels. We have medicines that suppress vegf and slow cancers; they help in some cases. Good luck.