CXCL5 and melanoma: Compared with melanoma cells with no or low CXCL5 expression, melanoma cells with high CXCL5 expression have significantly greater neutrophil infiltration, suggesting that CXCL5 recruits a large number of neutrophils to melanomas and that the interaction between neutrophils and melanoma cells further promotes tumor cell migration to lymphatic vessels, ultimately leading to lymph node metastasis.