Differential LINE-1 Hypomethylation of Gastric Low-Grade Dysplasia from High Grade Dysplasia and Intramucosal Cancer.
- Author:
Jeong Rok LEE
1
;
Woo Chul CHUNG
;
Jin Dong KIM
;
Kang Moon LEE
;
Chang Nyol PAIK
;
Sung Hoon JUNG
;
Ji Han JUNG
;
Yun Kyung LEE
;
Sok Won HAN
Author Information
1. Department of Internal Medicine, Cheju Halla General Hospital, Jeju, Korea.
- Publication Type:Original Article
- Keywords:
LINE-1 methylation;
Gastric epithelial dysplasia;
Intramucosal cancer
- MeSH:
Methylation;
ROC Curve;
Sensitivity and Specificity;
Sulfites
- From:Gut and Liver
2011;5(2):149-153
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND/AIMS: Gastric epithelial dysplasia is considered a precancerous lesion with a variable clinical course. There is disagreement, however, regarding histology-based diagnoses, which has led to confusion in choosing a therapeutic plan. New objective markers are needed to determine which lesions progress to true malignancy. We measured LINE-1 methylation levels, which have been reported to strongly correlate with the global methylation level in gastric epithelial dysplasia and intramucosal cancer. METHODS: A total of 145 tissue samples were analyzed by two histopathologists. All tissues were excised by therapeutic endoscopic mucosal resection and paired with adjacent normal tissue samples. A modified long interspersed nucleotide elements-combined bisulfite restriction analysis (COBRA-LINE-1) method was used. RESULTS: Gastric epithelial dysplasia and intramucosal cancer tissues had significantly lower levels of LINE-1 methylation than adjacent normal gastric tissues. High-grade dysplasia and intramucosal cancer were distinguishable from low-grade dysplasia based on LINE-1 methylation levels. Furthermore, the distinction could be determined with high sensitivity and specificity, as shown by the receiver operating characteristic (ROC) curve (AUC, 0.82; 95% confidence interval, 0.74 to 0.88). CONCLUSIONS: LINE-1 methylation levels may provide a diagnostic tool for identifying high-grade dysplasia and intramucosal cancer.
