title: Intraductal papillary-mucinous neoplasms of the gastric and intestinal types may have less malignant potential than the pancreatobiliary type.
abstract: OBJECTIVE
  Intraductal papillary-mucinous neoplasms (IPMNs) of the pancreas are classified into 4 types--gastric, intestinal, pancreatobiliary, and oncocytic--on the basis of their morphology and immunohistochemistry. We classified IPMNs at our institute and used this classification to determine the clinicopathological features, prognosis, and malignant potential of the 4 types.
  
  
  METHODS
  Sixty-one patients with IPMN who underwent surgery between 2000 and 2007 were evaluated retrospectively.
  
  
  RESULTS
  There were 24 tumors of the gastric type, 22 intestinal, 12 pancreatobiliary, and 3 oncocytic. Patients with the intestinal or gastric type had a better prognosis than those with the pancreatobiliary type. The intestinal and pancreatobiliary types had almost the same frequencies of carcinoma, but the intestinal type tended to have a lower frequency of invasive carcinoma than the pancreatobiliary type. Patients with invasive carcinomas derived from intestinal-type IPMNs tended to have a better prognosis than those whose invasive carcinomas were derived from the pancreatobiliary type.
  
  
  CONCLUSIONS
  Intraductal papillary-mucinous neoplasm of the gastric and intestinal types may have less malignant potential than that of the pancreatobiliary type. Invasive carcinomas derived from intestinal-type IPMNs may be less invasive and slower growing than those derived from the pancreatobiliary type.
authors.affiliation: Department of Gastroenterological, General, Breast and Thyroid Surgery, Faculty of Medicine, Yamagata University, Yamagata City, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Takasu
authors.forename: Wataru
authors.initials: W
authors.lastname: Kimura
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Moriya
authors.forename: Ichiro
authors.initials: I
authors.lastname: Hirai
authors.forename: Akiko
authors.initials: A
authors.lastname: Takeshita
authors.forename: Yukinori
authors.initials: Y
authors.lastname: Kamio
authors.forename: Takashi
authors.initials: T
authors.lastname: Nomura
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000145:classification / Q000473:pathology* / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001650:Bile Duct Neoplasms / Q000145:classification / Q000473:pathology* / Q000601:surgery; D021441:Carcinoma, Pancreatic Ductal / Q000145:classification / Q000473:pathology* / Q000601:surgery; D002291:Carcinoma, Papillary / Q000145:classification / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D007414:Intestinal Neoplasms / Q000145:classification / Q000473:pathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D010180:Pancreatectomy; D010190:Pancreatic Neoplasms / Q000145:classification / Q000473:pathology* / Q000601:surgery; D011379:Prognosis; D012189:Retrospective Studies; D013274:Stomach Neoplasms / Q000145:classification / Q000473:pathology* / Q000601:surgery