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- W1710200627 abstract "Chromosome 3p is deleted frequently in various types of human cancers, including lung cancer. Recently, the RASSF1A gene was isolated from the 3p21.3 region homozygously deleted in lung and breast cancer cell lines, and it was shown to be inactivated by hypermethylation of the promoter region in lung cancers. In this study, we investigated the pathogenetic and clinicopathological significances of RASSF1A methylation in the development and/or progression of lung adenocarcinoma.Association of RASSF1A methylation with clinicopathological features, allelic imbalance at 3p21.3, p53 mutations, and K-ras mutations was examined in 110 stage I lung adenocarcinomas.Thirty-five of 110 (32%) tumors showed RASSF1A methylation. RASSF1A methylation was dominantly detected in tumors with vascular invasion (P = 0.0242) or pleural involvement (P = 0.0305), and was observed more frequently in poorly differentiated tumors than in well (P = 0.0005) or moderately (P = 0.0835) differentiated tumors. Furthermore, RASSF1A methylation correlated with adverse survival by univariate analysis (P = 0.0368; log-rank test) as well as multivariate analysis (P = 0.032,; risk ratio 2.357; 95% confidence interval, 1.075-5.169). The correlation between RASSF1A methylation and allelic imbalance at 3p21.3 was significant (P = 0.0005), whereas the correlation between RASSF1A methylation and p53 mutation was borderline (P = 0.0842). However, there was no correlation or inverse correlation between RASSF1A methylation and K-ras mutation (P = 0.2193).These results indicated that epigenetic inactivation of RASSF1A plays an important role in the progression of lung adenocarcinoma, and that RASSF1A hypermethylation appears to be a useful molecular marker for the prognosis of patients with stage I lung adenocarcinoma." @default.
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- W1710200627 date "2002-07-01" @default.
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- W1710200627 title "Clinicopathological significance of epigenetic inactivation of RASSF1A at 3p21.3 in stage I lung adenocarcinoma." @default.
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