In pancreas, mucins are secreted by pancreatic duct cells.22 It has been reported that mucin gene is abnormally expressed in pancreatic cancer and may have opportunities to play a role in the diagnosis and therapy.23 CA 19‐9, CA 242, and CA 50 are mucin markers and are thought to be aberrantly expressed when patients are suffering from pancreatic cancer. Here, MUC5AC is linked to pancreatic neoplasm.