VDR and pancreatic ductal adenocarcinoma: The aim of this study was to investigate the expression of the vitamin D receptor (VDR), 1,25-dihydroxyvitamin D3 24-hydroxylase (CYP24A1), and the calcium-sensing receptor (CaSR), a vitamin D target gene, in the different regions of the pancreas in patients with chronic pancreatitis (n = 6) and pancreatic ductal adenocarcinomas (PDAC) (n = 17).