Cancer cells secrete chemokine (C-C motif) ligand 5 (CCL5) to attract immunosuppressive Tregs [15], C-X-C motif chemokine 5 (CXCL5) to recruit neutrophils [16] and colony-stimulating factor-1 (CSF-1) to attract macrophages [17]. This evidence concerns the gene CXCL5 and cancer.