CXCL5 (C-X-C motif chemokine ligand 5) is a signaling protein that helps recruit neutrophils—a type of white blood cell—to sites of inflammation or injury. It plays an essential role in the body’s innate immune defense and contributes to inflammatory processes in conditions ranging from infections to chronic inflammatory diseases. CXCL5 is also associated with cancer progression, where it can promote tumor growth and metastasis by attracting and activating neutrophils within the tumor microenvironment.