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Expression of cell cycle-related molecules in biliary premalignant lesions: biliary intraepithelial neoplasia and biliary intraductal papillary neoplasm.

Abstract：

:Cholangiocarcinoma of intrahepatic and extrahepatic bile ducts has a multistep carcinogenesis. Two premalignant lesions have been suggested for invasive cholangiocarcinoma: biliary intraepithelial neoplasia and intraductal papillary neoplasm of the bile duct. How the carcinogenetic process differs between biliary intraepithelial neoplasia and intraductal papillary neoplasm of the bile duct is not clear. In this study, we performed a pathological study to reveal the expression of key molecules related to the cell cycle during 2 carcinogenetic lineages. We immunohistochemically examined the expression of p21, p53, cyclin D1, and Dpc4 in a total of 89 cases: nonneoplastic biliary epithelium, biliary intraepithelial neoplasia, intraductal papillary neoplasm of the bile duct, and invasive cholangiocarcinoma. The expression of p21, p53, and cyclin D1 was up-regulated with histological progression in both biliary intraepithelial neoplasia and intraductal papillary neoplasm of the bile duct, whereas Dpc4 expression was down-regulated in these 2 lineages. In biliary intraepithelial neoplasia, p21 expression was significantly up-regulated early on. In contrast, levels of all molecules changed gradually in intraductal papillary neoplasm of the bile duct. Changes in p53 expression during histological progression differed significantly between biliary intraepithelial neoplasia and intraductal papillary neoplasm of the bile duct. p53 expression was dramatically up-regulated at the invasive stage of biliary intraepithelial neoplasia, whereas it was quite low in noninvasive biliary intraepithelial neoplasia. In contrast, p53 expression was already up-regulated in low-grade intraductal papillary neoplasm and reached a plateau in high-grade intraductal papillary neoplasm and invasive cholangiocarcinoma. This study suggested p21, p53, cyclin D1, and Dpc4 to be involved in the carcinogenesis of both biliary intraepithelial neoplasia and intraductal papillary neoplasm of the bile duct. p53 expression was regulated differently in biliary intraepithelial neoplasia compared with intraductal papillary neoplasm of the bile duct.

journal_name

Hum Pathol

journal_title

Human pathology

authors

Nakanishi Y,Zen Y,Kondo S,Itoh T,Itatsu K,Nakanuma Y

doi

10.1016/j.humpath.2007.11.018

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

1153-61

issue

8

eissn

0046-8177

issn

1532-8392

pii

S0046-8177(07)00687-9

journal_volume

39

pub_type

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