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- W2040290149 abstract "A genome-wide hypomethylation is a common and crucial event in cancer. This study was to evaluate common epithelial ovarian cancer (EOC) if long interspersed element-1 (LINE-1) repetitive sequences methylation levels are progressively decreased during multistage carcinogenesis and there are the correlation between LINE-1 methylation levels and clinicopathologic characteristics. A total of 59 pairs of microdissected EOC tissues obtained from patients with EOC were examined for the methylation levels of LINE-1 repetitive sequences by a COBRALINE-1 (combined bisulfite restriction analysis of LINE-1) PCR protocol. The methylation levels were correlated with clinicopathologic parameters to determine the potential role of global hypomethylation as a prognostic marker for EOC. The LINE-1 methylation levels of 59 EOCs, 34.87 +/- 7.39%, were lower than in representative normal ovarian tissues (46.89 +/- 8.31%; 95% CI: 9.42-14.62; P < 0.001, paired-two-tailed t test). A decrease in the LINE-1 level of methylation was correlated with histological subtypes, higher FIGO and advanced tumor grade. Patients with greater hypomethylation (i.e., a methylation level <or=34.87%) had poorer mean overall survival (P = 0.003) and a lower mean progression-free interval (P < 0.001). Therefore, progressive decrease in LINE-1 methylation level is a common and important epigenetic process in ovarian multistep carcinogenesis. Moreover, the COBRALINE-1 method has the potential to be used as a tumor marker for EOC." @default.
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- W2040290149 date "2008-07-01" @default.
- W2040290149 modified "2023-09-25" @default.
- W2040290149 title "LINE-1 hypomethylation level as a potential prognostic factor for epithelial ovarian cancer" @default.
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- W2040290149 doi "https://doi.org/10.1111/j.1525-1438.2007.01117.x" @default.
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