 Treatment with an anti-VEGF antibody may help to exert a direct anti-angiogenic effect by binding to and clearing VEGF from the tumor microenvironment, thus preventing the formation of new blood vessels. Bevacizumab is a recombinant humanized anti-VEGF monoclonal antibody that inhibits the growth of a number of human cancers, including ovarian cancer. Additional antitumor activity may be obtained through the effects of bevacizumab on tumor vasculature, interstitial pressure, and blood vessel permeability, all of which could allow for enhanced delivery of concurrently administered chemotherapeutic agents to tumor cells. 