a question about Biology (third)?

Question

Some cancer drugs work by inhibiting angiogenesis, the formation of blood vessels. Considering what is required for cells to enter the cell cycle, why such drugs would inhibit tumor growth?

Answer 1

This is not a pure biology question. Should be bio-chemistry.

Answer 2

Tumors, like any tissue, require blood flow, same as all other tissues. Most tissue growth is organized and incorperates vessel formation at the time. Without producing angiogenic hormones to cause vessel growth into a tumor, the tumor will starve. It would be like a large city without having any roads.