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Colorectal polyps and other precursor lesions. Need for an expanded view
1Mayo Clinic, Department of Laboratory Medicine and Pathology, 200 First Street SW, Rochester, MN 55905, USA. burgart.lawrence@mayo.edu
Gastroenterology Clinics of North America
|December 20, 2002
Summary
The link between colon polyps and cancer is complex. Some right-sided hyperplastic polyps may precede adenocarcinoma, especially with DNA mismatch repair deficiencies.
Area of Science:
- Gastroenterology
- Oncology
- Molecular Biology
Background:
- The traditional view of adenomas as direct precursors to adenocarcinoma is being challenged.
- The complex interplay between precursor lesions and adenocarcinoma, particularly those with DNA mismatch repair (MMR) deficiency, requires further elucidation.
Purpose of the Study:
- To investigate the role of right-sided hyperplastic polyps as potential precursors to adenocarcinoma.
- To explore the mechanisms, including DNA mismatch repair defects and MGMT gene methylation, involved in adenocarcinoma development from hyperplastic polyps.
Main Methods:
- Analysis of precursor lesions and associated adenocarcinomas.
- Evaluation of DNA mismatch repair status.
- Assessment of MGMT gene methylation patterns.
Main Results:
- Evidence suggests that right-sided hyperplastic polyps can act as precursor lesions in some cases of adenocarcinoma.
- Defective DNA mismatch repair and MGMT gene methylation are implicated in this pathway.
Conclusions:
- The relationship between precursor lesions and adenocarcinoma is more intricate than previously thought.
- Right-sided hyperplastic polyps, particularly those with specific molecular alterations, warrant further investigation as potential adenocarcinoma precursors.
- Reclassification of some hyperplastic polyps as serrated adenomas may be considered based on morphology or molecular findings.