On the contrary, CXCL4, CXCL9, CXCL10, CXCL11, CXCL12, CXCL13, and CXCL14, lacking the ELR amino acid motif (ELR−), can inhibit tumor angiogenesis (47, 87, 88). This evidence concerns the gene PF4 and neoplasm.