CXCR4 and melanoma: The expression of CXCR4 by melanoma cells in patient samples has been correlated with the likelihood of pulmonary metastasis [50,51] and increased pulmonary metastasis has been seen in mice inoculated with melanoma cells overexpressing CXCR4 [52,53,54], with CXCR4 inhibition reversing this effect [56].