p53 but not bcl-2 is expressed by most cholangiocarcinomas: a study of 28 cases

Histopathology. 1999 Jun;34(6):497-501. doi: 10.1111/j.1365-2559.1999.00654.x.

Abstract

Aims: To examine the frequency and pattern of expression of p53 and bcl-2 in archival material from patients with cholangiocarcinomas and to evaluate their respective roles in its pathogenesis, diagnosis and prognosis.

Methods and results: Twenty-eight surgical cases of cholangiocarcinomas diagnosed at St James's University Hospital and 16 control cases were immunostained with monoclonal antibodies to p53 and bcl-2 using streptavidin-biotin complex method. Pressure cooker was used for antigen retrieval. Of the cholangiocarcinomas, 85.7% (24/28) overexpressed p53. The intensity of staining in these cases varied from 1+ in 2, 2+ in 10 and 3+ in 12 cases. None of the 28 tumours expressed bcl-2. The well differentiated nature of the tumour made assessment of dysplasia difficult, however, where present it did not express p53 or bcl-2. The bile duct epithelium adjacent to the tumour and in the control cases did not show any significant nuclear staining for either antigen.

Conclusions: Overexpression of p53 appears to play an important role as a late event in the pathogenesis of cholangiocarcinomas, while we found no evidence of bcl-2 overexpression. The expression of p53 in 86% of the invasive tumours, as compared to its lack in the adjacent normal bile duct epithelium, makes it potentially useful in the diagnostic histopathology of these cases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bile Duct Neoplasms / metabolism*
  • Bile Duct Neoplasms / pathology
  • Bile Ducts, Intrahepatic / metabolism*
  • Bile Ducts, Intrahepatic / pathology
  • Biomarkers, Tumor
  • Cholangiocarcinoma / metabolism*
  • Cholangiocarcinoma / pathology
  • Humans
  • Immunohistochemistry
  • Prognosis
  • Proto-Oncogene Proteins c-bcl-2 / biosynthesis*
  • Tumor Suppressor Protein p53 / biosynthesis*

Substances

  • Biomarkers, Tumor
  • Proto-Oncogene Proteins c-bcl-2
  • Tumor Suppressor Protein p53