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• W2079254150 abstract "BACKGROUND Hepatoma specific γ-glutamyl transferase (HS-GGT) bands were expressed in the development of hepatocellular carcinoma (HCC) and were associated with a high incidence of HCC diagnosis. The objectives of this study were to determine the levels of HS-GGT quantitatively in the sera of patients with different liver diseases. The methylational status of GGT gene CCGG sites was analyzed in hepatoma tissues. METHODS The HS-GGT concentrations were quantitatively analyzed in the sera of 156 HCC patients and others with liver diseases or extrahepatic tumors. In 20 hepatoma tissues, the GGT enzyme proteins were purified, the activities of GGTs of different molecular form were examined, total RNAs were extracted and amplified by using a nested polymerase chain reaction (PCR) assay, and the methylational status of CCGG site (M3) in the 5′-noncoding region of GGT genes was investigated with the restriction enzyme Hpa II. RESULTS Total GGT activities in patients with liver diseases and extrahepatic tumors were abnormally increased. The levels of serum HS-GGT were significantly elevated (P < 0.001) in the HCC group; the incidence of HS-GGT over 5.5 IU/L was 86% in HCC patients and less than 3% in patients with other diseases. From liver cancer to distal noncancerous tissues, an increasing tendency (P < 0.05) of total RNA concentrations was found; the frequencies of amplified fragment and hypomethylated M3 site of GGT genes were 100% and 75% in HCC, 85% and 55% in paracancerous tissues, and 75% and 50% in noncancerous tissues, respectively. An inverse correlation was found between methylational degrees of GGT genes and expression levels of GGT. CONCLUSIONS The abnormal alteration of serum HS-GGT level is a sensitive tumor marker for HCC diagnosis or differentiation, and the overexpression of GGT in HCC may be related to the hypomethylational status of CCGG sites of GGT genes. Cancer 2000;88:761–9. © 2000 American Cancer Society." @default.
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• W2079254150 date "2000-02-15" @default.
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• W2079254150 title "Abnormal expression of hepatoma specific ?-glutamyl transferase and alteration of ?-glutamyl transferase gene methylation status in patients with hepatocellular carcinoma" @default.
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• W2079254150 doi "https://doi.org/10.1002/(sici)1097-0142(20000215)88:4<761::aid-cncr5>3.0.co;2-5" @default.
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