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Infrequent microsatellite instability in oesophageal cancers
F Muzeau1, J F Fléjou, J Belghiti
1Inserm U410, Faculté Bichat, Paris, France.
British Journal of Cancer
|January 1, 1997
Summary
Microsatellite instability is common in many cancers. However, this study found low microsatellite instability in oesophageal cancers, suggesting DNA mismatch repair defects are not a major cause.
Area of Science:
- Oncology
- Genetics
- Gastroenterology
Background:
- Microsatellite alterations are frequent in various cancers like colorectal, gastric, and pancreatic.
- DNA mismatch repair (MMR) gene defects are often linked to microsatellite instability (MSI).
Purpose of the Study:
- To investigate the frequency of microsatellite instability at 39 poly-CA loci in oesophageal cancers.
- To determine the role of DNA mismatch repair system defects in oesophageal tumorigenesis.
Main Methods:
- Analysis of 39 poly-CA microsatellite loci for instability.
- Examination of 20 squamous cell carcinomas and 26 Barrett's adenocarcinomas of the oesophagus.
Main Results:
- No oesophageal tumors exhibited instability at a high percentage of tested loci.
- Four squamous cell carcinomas and six Barrett's adenocarcinomas showed instability at one locus.
- Three Barrett's adenocarcinomas displayed instability at two loci.
Conclusions:
- The low frequency of microsatellite instability suggests minimal involvement of DNA mismatch repair defects in oesophageal cancers.
- The observed instability may be attributed to a background level rather than a systemic MMR deficiency.