Volociximab (M200) is a chimeric human/murine IgG4 antibody IIA1 targeting integrin α5β1 (EC50=0.2 nM). Integrin α5β1 is a major fibronectin receptor involved in angiogenesis. Volociximab has antiangiogenic and antitumor activities and inhibits the proliferation of human umbilical vein vascular endothelial cells (HUVECs).