Related Experiment Video
Updated: Dec 9, 2025
28:15
Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer
Published on: July 28, 2010
12.6K
Molecular characteristics of colorectal hyperplastic polyp subgroups
Mehtat Ünlü1, Evren Uzun1, Göksel Bengi2
1Department of Pathology, Dokuz Eylül University School of Medicine, İzmir, Turkey.
Summary
Hyperplastic polyps, particularly goblet-rich (GRHPs) and microvesicular (MVHPs), are precancerous lesions. GRHPs show KRAS mutations, while MVHPs and mucin-poor hyperplastic polyps (MPHPs) exhibit BRAF mutations, guiding colorectal cancer understanding.
Area of Science:
- Gastroenterology
- Molecular Pathology
- Oncology
Background:
- Hyperplastic polyps (HPs) play a role in colorectal carcinogenesis, particularly via the serrated pathway.
- Morphological subtypes of HPs and lesions with mixed hyperplastic and adenomatous components present diagnostic challenges.
Purpose of the Study:
- To investigate the molecular characteristics of different hyperplastic polyp subtypes.
- To analyze molecular alterations in polyps with both hyperplastic and adenomatous features.
Main Methods:
- Analysis of 49 hyperplastic polyps (19 microvesicular - MVHP, 19 goblet-rich - GRHP, 11 mucin-poor - MPHP) and 10 mixed polyps.
- Real-time PCR was used to detect KRAS and BRAF mutations and microsatellite instability (MSI).
Main Results:
- BRAF mutations were found in 68.4% of MVHPs and 81% of MPHPs, predominantly in the right colon.
- KRAS mutations were detected in 73% of GRHPs, mainly in the rectosigmoid area.
- KRAS mutations were present in 50% of mixed polyps in both components; no BRAF mutations were observed in mixed polyps.
Conclusions:
- Hyperplastic polyps, regardless of size, are precancerous lesions with distinct molecular profiles.
- Goblet-rich HPs are associated with KRAS mutations, while MVHPs and MPHPs show BRAF mutations.
- Morphological subtyping of HPs is recommended to alert gastroenterologists to their precancerous potential.
Related Concept Videos
02:07Tumor Progression
7.1K
Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
7.1K
01:17Chronic Bowel Disorders: Introduction
666
Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
666