title: DNA Methylation as Surrogate Marker For Gastric Cancer.
abstract: 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.
authors.affiliation: Departments of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors.forename: Jung-Hwan
authors.initials: JH
authors.lastname: Oh
authors.affiliation: Departments of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors.forename: Sung-Hoon
authors.initials: SH
authors.lastname: Jung
authors.affiliation: Microbiology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors.forename: Seung-Jin
authors.initials: SJ
authors.lastname: Hong
authors.affiliation: Microbiology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors.forename: Mun-Gan
authors.initials: MG
authors.lastname: Rhyu
keywords: Biological markers; CpG Islands; DNA methylation; Helicobacter pylori; Stomach neoplasms