GNAS and pancreatic intraductal papillary-mucinous neoplasm: Since all of intestinal type IPMNs have GNAS mutations and since invasive cancer associated with IPMNs appears to be much more frequent in intestinal type IPMN, detection of GNAS mutation in the specimen from intramural gastric lesion by preoperative EUS-FNA biopsy/cytology could become an indicator suggesting that the tumor should be excised.