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KMID : 1140220150200030172
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대한암예방학회지
2015 Volume.20 No. 3 p.172 ~ p.178
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DNA Methylation as Surrogate Marker For Gastric Cancer
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Oh Jung-Hwan
Jung Sung-Hoon
Hong Seung-Jin
Rhyu Mun-Gan
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Abstract
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Stomach cancer remains, stubbornly, highly prevalent in East Asia. Still, stomach cancer has few biomarkers by which it can be predicted. Helicobacter pylori infection, a known carcinogen of stomach cancer, usually goes undetected prior to cancer diagnosis, due to the poor mucosal environments that its related gastric atrophy causes. We propose, herein, an endoscopic-biopsy-based cancer-predicting DNA methylation marker. We semi-quantitatively examined the methylation-variable sites near the CpG-island margins by radioisotope-labeling methylation-specific polymerase chain reaction in association with H. pylori, which increases age-related over-methylation in CpG islands of gastric mucosa. These age-related methylation patterns of the transitional-CpG sites are proposed as useful surrogate markers for stomach cancer. It would be helpful for setting the optimal screening interval for high-risk subjects as well as for estimating the prognosis and the predictability for recurrence of early gastric cancer in patients having undergone endoscopic submucosal dissection. New screening-interval guidelines for gastric cancer should be suggested considering individual risk based on age, severity of atrophy, H. pylori status, and DNA methylation pattern.
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KEYWORD
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Biological markers, CpG Islands, DNA methylation, Helicobacter pylori, Stomach neoplasms
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