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K-ras mutations in endometrial carcinomas with microsatellite instability
H Lagarda1, L Catasus, R Arguelles
1Department of Pathology, Hospital Santa Creu i Sant Pau, Autonomous University of Barcelona, Spain.
The Journal of Pathology
|February 17, 2001
Summary
K-ras mutations are linked to microsatellite instability (MI) in endometrial cancer. This study found K-ras mutations more often in MI-positive tumors, suggesting a connection possibly due to altered methylation.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- K-ras mutations are observed in endometrial hyperplasias and carcinomas.
- A clear correlation between K-ras mutations and microsatellite instability (MI) in these lesions remains undefined.
Purpose of the Study:
- To investigate the relationship between K-ras mutations and microsatellite instability (MI) in endometrial lesions.
- To determine if K-ras mutations are associated with specific molecular subtypes of endometrial cancer.
Main Methods:
- Analysis of K-ras mutations in 58 endometrial carcinomas (ECs) and 22 endometrial hyperplasias (EHs) using SSCP, restriction analysis, and DNA sequencing.
- Reconfirmation of previously established MI status using BAT-25 and BAT-26 markers via SSCP.
Main Results:
- K-ras mutations were detected in 18.9% of ECs, exclusively in endometrioid carcinomas.
- K-ras mutations were significantly more frequent in MI-positive (42.8%) compared to MI-negative tumors (11.3%) (p=0.017).
- Methylation-related transitions in K-ras were common in MI-positive tumors, suggesting a link to altered methylation patterns.
Conclusions:
- The findings support a strong association between K-ras mutations and microsatellite instability in endometrial carcinomas.
- The prevalence of methylation-related transitions in K-ras mutations may indicate a causal relationship with the altered methylation status characteristic of MI.