CXCL12 and neoplasm: Results indicated reduced CXCL12 levels in tumor compared to their respective control tissues, including BLCA, BRCA, CESC, CHOL, COAD, ESCA, HNSC, KICH, KILC, KILP, LIHC, LUAD, LUSC, PRAD, READ, STAD, THCA, UCEC, ACC, OV, SKCM, UCS.