Anti-VEGF Humanised Mnoclonal Antibody The anti-VEGF antibody is an inhibitor of angiogensis (blood-vessel growth) that may hinder the growth of cancer tumors by starving their blood supply. Genentech is investigating this antibody in Phase II Vascular endothelial growth factor (VEGF) is an natural protein that promotes angiogensis (blood vessel growth). VEGF could potentially benefit patients with a heart that is functioning but has a blocked blood supply due to atheriosceleroticcoronar.