title: Reduced expression of p53 and cyclin A in intraductal mucin-hypersecreting neoplasm of the pancreas compared with usual pancreatic ductal adenocarcinoma.
abstract: OBJECTIVE
  Intraductal mucin-hypersecreting neoplasm (IMHN) of the pancreas, a slow-growing malignancy with a favorable prognosis, is distinctly categorized from the high-grade malignancy of the more common ductal adenocarcinoma. The aim of the present study was to clarify the molecular differences underlying the biological differences between IMHN and ductal adenocarcinoma of the pancreas.
  
  
  METHODS
  The expression of p53 and cyclin A in IMHN was compared with that in ductal adenocarcinoma of the pancreas immunohistochemically.
  
  
  RESULTS
  In IMHN, the incidence of p53 and cyclin A ascertained by positive nuclear staining was significantly lower than that in ductal adenocarcinoma. Furthermore, in ductal adenocarcinoma, p53 and cyclin A are topographically coexpressed.
  
  
  CONCLUSIONS
  These results suggest that the overexpression of p53 and cyclin A plays a role in the tumorigenesis of pancreatic ductal adenocarcinoma, and sparse expression of both antigens in IMHN may partly contribute to its low-grade malignant characteristics.
authors.affiliation: The Second Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Mukawa
authors.forename: S
authors.initials: S
authors.lastname: Kawa
authors.forename: Y
authors.initials: Y
authors.lastname: Aoki
authors.forename: Y
authors.initials: Y
authors.lastname: Zhai
authors.forename: T
authors.initials: T
authors.lastname: Nikaido
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics* / Q000473:pathology; D002288:Adenocarcinoma, Mucinous / Q000235:genetics* / Q000473:pathology; D000231:Adenocarcinoma, Papillary / Q000235:genetics / Q000473:pathology; D019925:Cyclin A / Q000235:genetics*; D015972:Gene Expression Regulation, Neoplastic / Q000502:physiology; D006801:Humans; D007124:Immunoenzyme Techniques; D010179:Pancreas / Q000473:pathology; D010190:Pancreatic Neoplasms / Q000235:genetics* / Q000473:pathology; D011379:Prognosis; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*
chemical_list: D019925:Cyclin A; D016159:Tumor Suppressor Protein p53