CCL2 and cancer: Chemokines such as CCL2, CCL23, CCL25, CCL26, CCL4, CCL5, CXCL10, CXCL11, CXCL3, and CXCL5 were differentially expressed across subclusters in more than 15 cancer types, with marked differences observed in BRCA, LUAD, TGCT, and THCA (Supplementary Figure S18E).