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Impact of PTEN expression on the outcome of hepatitis C virus‐positive cirrhotic hepatocellular carcinoma patients: Possible relationship with COX II and inducible nitric oxide synthase
Author(s) -
Rahman Mohammad Atiqur,
Kyriazanos Ioannis D.,
Ono Takashi,
Yamanoi Akira,
Kohno Hitoshi,
Tsuchiya Mikako,
Nagasue Naofumi
Publication year - 2002
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.10458
Subject(s) - pten , hepatocellular carcinoma , cancer research , hccs , immunohistochemistry , downregulation and upregulation , tumor suppressor gene , pathology , protein kinase b , biology , medicine , carcinogenesis , cancer , pi3k/akt/mtor pathway , apoptosis , gene , biochemistry
PTEN, a novel tumor suppressor, functions as a regulator of both cell cycle progression and apoptosis. PTEN gene is frequently mutated or deleted in several malignancies including human hepatocellular carcinoma (HCC). The clinical significance and prognostic value of PTEN expression in HCC or in the surrounding non‐cancerous parenchyma remain obscure. Using immunohistochemistry, we analyzed the PTEN protein expression in 46 tissue sections collected from surgically resected hepatitis C virus (HCV)‐positive cirrhotic HCC patients. Although the surrounding normal liver tissue was strongly expressing PTEN in 42 cases (91.3%), the immunostaining intensity was low in 29 (63.1%) and high in 17 (36.9%) of the HCCs. Additionally a significant positive correlation was identified between low PTEN expression in the HCC and increased expression of iNOS and COX II in the surrounding liver. The overall survival was significantly longer for the HCC‐patients with high PTEN expression than patients with low PTEN expression. Univariate analysis revealed PTEN expression as an independent prognostic factor for patients survival. By Western blot analysis we also found that the Akt/PKB signaling, which is negatively regulated by PTEN, was upregulated in the HCCs in comparison to its expression in the surrounding liver tissue. These results demonstrate that downregulation of PTEN in the tumor is an important step in HCV‐positive cirrhotic hepatocarcinogenesis and might result in concomitant upregulation of iNOS and COX II in the surrounding liver in favor of tumor promotion. © 2002 Wiley‐Liss, Inc.