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Aberrant crypt foci in human colons: distribution and histomorphologic characteristics
B Shpitz1, Y Bomstein, Y Mekori
1Department of Surgery A, Meir General Hospital and Tel Aviv University School of Medicine, Israel.
Human Pathology
|May 22, 1998
Summary
Aberrant crypt foci (ACF), early colon cancer precursors, are more common in older individuals and the distal colon. Dysplastic ACF show larger size, more apoptosis, and higher proliferation than hyperplastic foci.
Area of Science:
- Gastroenterology
- Oncology
- Pathology
Background:
- Aberrant crypt foci (ACF) are early preneoplastic lesions in the colon.
- ACF are considered crucial in multistage colonic tumorigenesis.
- Understanding ACF distribution and characteristics is vital for early cancer detection.
Purpose of the Study:
- To investigate the distribution patterns of ACF in patients with sporadic colorectal cancer.
- To analyze the histomorphological features differentiating hyperplastic and dysplastic ACF.
- To explore the association of lymphoid follicles with ACF progression.
Main Methods:
- Microscopic examination of methylene blue-stained colonic mucosa from 74 colorectal cancer patients.
- Histomorphological analysis and microdissection of ACF.
- Assessment of apoptosis, proliferation (PCNA-labeling index), and lymphoid follicle presence.
Main Results:
- ACF prevalence increased with age and was higher in the sigmoid colon of cancer patients compared to benign disease patients.
- More ACF were found in the distal colon (descending, sigmoid, rectum) than proximal parts.
- Dysplastic ACF were larger, showed more apoptosis, increased proliferation, and frequent lymphoid follicles compared to hyperplastic foci.
Conclusions:
- ACF distribution and characteristics vary with age, location, and disease status.
- Histomorphological differences, including lymphoid follicle presence, may indicate progression potential of ACF.
- These findings contribute to understanding early colorectal tumorigenesis and potential biomarkers.