DKK1 and pancreatic intraductal papillary-mucinous neoplasm: Furthermore, DKK1 expression was extremely low in normal pancreatic tissue, but somewhat higher in 11 of 18 (61 %) samples of SPN, 6 of 12 (50 %) samples of IPMN and 10 of 12 (83 %) samples of PDAC.