Related Experiment Videos
Infrequent microsatellite instability in biliary tract cancer
1Department of Surgery I, School of Medicine, Iwate Medical University, Morioka, Iwate, Japan.
Journal of Surgical Oncology
|February 27, 2001
Summary
Microsatellite instability (MSI) is uncommon in biliary tract cancers, affecting about 13% of extrahepatic bile duct and ampullary cancers. While MSI patients showed better survival, it wasn't an independent prognostic factor.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Microsatellite instability (MSI) is a known biomarker in various cancers.
- Limited data exists on MSI prevalence in biliary tract cancers.
- This study investigates MSI and gene allelic loss in biliary tract tumors.
Purpose of the Study:
- To determine the frequency of MSI in extrahepatic bile duct (EHBD) and ampullary cancers.
- To assess allelic loss at the hMLH1 and hMSH2 gene loci.
- To evaluate the prognostic significance of MSI in these cancers.
Main Methods:
- Analysis of microsatellite alterations using 7 markers.
- Study included 38 EHBD cancer and 16 ampullary cancer cases.
- Utilized polymerase chain reaction and automated DNA sequencing.
Main Results:
- MSI prevalence was 13.2% in EHBD cancer and 12.5% in ampullary cancer.
- Loss of heterozygosity at hMLH1 and hMSH2 was observed in a small percentage of cases.
- MSI was associated with better survival in EHBD cancer but was not an independent prognostic factor.
Conclusions:
- Genetic defects in DNA mismatch repair and MSI appear infrequent in most biliary tract cancers.
- MSI's role in the majority of these cancers is likely limited.
- Further research may clarify MSI's specific role in subsets of biliary tract cancers.