CYP24A1 and neoplasm: Therefore, we examined the expression pattern of the two of most-relevant genes for vitamin D metabolism and signaling (VDR and CYP24A1) and also included one vitamin D target gene (CaSR) in the different morphological structures of the pancreas, such as acinar cells, ducts, endocrine cells, and stroma as well as tumor regions from patients with PDAC.