title: Variant of intraductal carcinoma (with scant mucin production) is of main pancreatic duct origin: a clinicopathological study of four patients.
abstract: OBJECTIVE
  To investigate the histopathological and immunohistochemical features of intraductal "nodular" tumor located in the main pancreatic duct.
  
  
  METHODS
  Four cases were studied, and the results were compared with those in 10 cases of common ductal adenocarcinomas of the pancreas.
  
  
  RESULTS
  The intraductal nodular carcinoma were large, more than 3 cm in diameter (range, 3-7 cm), lacked macroscopic mucin production, and presented a papillotubular adenocarcinoma. These tumors showed minimal invasion into the periductal tissue, duodenum, and choledochus. Immunohistochemically, the tumor cells were negative for anti-CEA and faintly positive for anti-CA19-9, in all except one tumor, whereas the common ductal adenocarcinomas were clearly positive for both. The postoperative course was favorable, and all three living patients remained healthy for more than 4 yr.
  
  
  CONCLUSIONS
  These tumors may be variants of intraductal tumors with a more favorable prognosis.
authors.affiliation: Department of Pathology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Suda
authors.forename: S
authors.initials: S
authors.lastname: Hirai
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: M
authors.initials: M
authors.lastname: Mogaki
authors.forename: T
authors.initials: T
authors.lastname: Oyama
authors.forename: T
authors.initials: T
authors.lastname: Mitsui
authors.forename: M
authors.initials: M
authors.lastname: Fujibayashi
authors.forename: K
authors.initials: K
authors.lastname: Kumazawa
authors.forename: T
authors.initials: T
authors.lastname: Kajiwara
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology / Q000378:metabolism / Q000473:pathology*; D000368:Aged; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D009077:Mucins / Q000096:biosynthesis; D009361:Neoplasm Invasiveness; D010183:Pancreatic Ducts / Q000737:chemistry / Q000473:pathology*; D010190:Pancreatic Neoplasms / Q000453:epidemiology / Q000378:metabolism / Q000473:pathology*; D011379:Prognosis
chemical_list: D009077:Mucins