Hypermethylation of the hMLH1 Gene in Gastric Cancers
Author Information
Author(s): Sakata K, Tamura G, Endoh Y, Ohmura K, Ogata S, Motoyama T
Primary Institution: Department of Pathology, Yamagata University School of Medicine
Hypothesis
Hypermethylation of the hMLH1 gene promoter is a frequent cause of microsatellite instability in gastric cancers.
Conclusion
Hypermethylation of the hMLH1 promoter occurs in non-cancerous gastric mucosa of microsatellite instability-H tumours and may increase the risk of subsequent neoplasia.
Supporting Evidence
- All microsatellite instability-H tumours had evidence of methylation of the hMLH1 promoter.
- Methylation status correlated with hMLH1 protein expression.
- Hypermethylation was detected in non-cancerous gastric mucosa adjacent to and distant from tumours.
Takeaway
This study found that a gene related to cancer, called hMLH1, gets turned off in stomach cancers, which can lead to more cancer later on.
Methodology
The study used methylation-specific PCR to investigate the methylation status of the hMLH1 gene promoter in gastric cancer samples and adjacent non-cancerous tissues.
Participant Demographics
Patients ranged in age from 59 to 84 years, with an average age of 72 years.
Statistical Information
P-Value
p<0.0000005
Statistical Significance
p<0.0000005
Digital Object Identifier (DOI)
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