This research study will look at the effect of an anti-angiogenesis medication called Bevacizumab on blood vessels. Anti-angiogenesis medicines fight cancer by cutting off a tumor's blood supply, starving the tumor of nutrients and oxygen. Previous studies have shown these types of drugs can cause hypertension. The purpose of this study is to help researchers better understand why these drugs cause hypertension. This information will assist researchers in learning how to control this side effect.