CXCL5 and cancer: Not only recruiting immunosuppressive cells, such as precursors of TAMs, neutrophils, and myeloid-derived suppressor cells in the tumor microenvironment [30], CXCL5 can recruit endothelial cells (ECs) via its highly conserved glutamic acid-leucine-arginine ‘ELR’ motif [29,31], promoting cancer progression in various cancer types [20].