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• W1500817860 endingPage "32" @default.
• W1500817860 startingPage "1223" @default.
• W1500817860 abstract "NAD(P)H: quinone oxidoreductase 1 (NQO1), a cytosolic enzyme which catalyzes the two-electron reduction of quinone compounds, has been suggested to prevent the generation of semiquinone free radicals and reactive oxygen species, thus protecting cells from oxidative damage. However, the enzymatic activity of NQO1 strongly depends on the individual genetic polymorphism of the NQO1 gene. A common NQO1 polymorphism is a C to T transition at position 609, which results in an inactive enzyme. Recent studies showed that NQO1 is an important enzyme for stabilizing p53 protein, which is involved in anti-tumorigenesis. Thus, the lack of enzymatic activity in the homozygous C609T NQO1 polymorphism may play a pivotal role in tumor development. This study aimed to investigate the relationship between C609T NQO1 polymorphism and p53 expression in human hepatocellular carcinoma (HCC). Genotyping of NQO1 was performed on 100 HCC specimens by PCR-RFLP analysis. In addition, NQO1 and p53 protein expression in HCC samples at different TNM stages was determined by immunohistochemistry. Our data showed that (1) the frequency of C609T NQO1 was significantly increased in TNM stage III HCC patients; (2) no significant association was found between p53 expression and C609T polymorphism of NQO1 gene; and (3) a tumor/non-tumor (T/N) ratio > 1.27 of NQO1 expression revealed by real-time qPCR analyses was positively correlated with poorer survival in patients with tumors >5 cm, suggesting that an increase of NQO1 expression may be an indicator of advanced tumor progression. This study provides important information about NQO1 genotypes and its expression to HCC tumor development and progression." @default.
• W1500817860 created "2016-06-24" @default.
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• W1500817860 date "2009-10-01" @default.
• W1500817860 modified "2023-09-25" @default.
• W1500817860 title "Analysis of NQO1 polymorphisms and p53 protein expression in patients with hepatocellular carcinoma." @default.
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• W1500817860 doi "https://doi.org/10.14670/hh-24.1223" @default.
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