FLT1 and colonic neoplasm: The relevant role of VEGFR-1 in colon cancer was further confirmed by the results of a recent study showing that selective blockade of VEGFR-1 by a receptor specific peptide (iVR1) in syngeneic and xenograft colorectal cancer models markedly inhibited tumor growth and recruitment of monocyte/macrophages at the tumor site [215].