VDR and neoplasm: When compared with matched normal tissues, the expression levels of VDR were lower in COAD, KIRC, KIRP, PCPG, PRAD, and READ and higher in tumor tissues of BRCA, CESC, CHOL, ESCA, HNSC, KICH, LIHC, LUAD, STAD, THCA, and UCEC (Figure 1A).