CLEC14A and neoplasm: Various in vitro and in vivo angiogenesis assays showed that antibody‐based modulation of CLEC14a‐CTLD inhibited VEGF‐dependent angiogenesis and tumor angiogenesis by directly inhibiting CTLD‐mediated molecular interactions between CLEC14a molecules and simultaneously downregulating expression of CLEC14a on the surface of endothelial cells.