CCL2, CCL4, CCL5, CCL7, CCL20, CCL23, CXCL5, CXCL6, CXCL9, CXCL10, CXCL13, and CX3CL1 are involved in improving CD8+ T cell trafficking and localization in tumour sites 50-52. This evidence concerns the gene CCL2 and neoplasm.