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Published on: September 25, 2011
Cell proliferation in colorectal tumor progression: an immunohistochemical approach to intermediate biomarkers
1Department of Pathology, S. Giovanni Vecchio Hospital, Torino, Italy.
Insights
Cell renewal in the large intestine follows a strict compartmental model. Abnormalities in cell proliferation, like hyperproliferation and Stage II abnormality, predict colorectal cancer progression but not de novo cases.
Area of Science:
- Gastroenterology
- Cell Biology
- Oncology
Background:
- Normal large intestine mucosa renewal adheres to a compartmentalized model.
- Proliferation markers like bromodeoxyuridine (BrdU) and Ki-67 are crucial for mapping cell division.
- Inflammation can induce transient or lasting mucosal hyperproliferation.
Purpose of the Study:
- To investigate the role of cell proliferation abnormalities in colorectal neoplasia.
- To determine the predictive value of hyperproliferation and Stage II abnormality in the adenoma-carcinoma sequence.
- To differentiate cytokinetic abnormalities in neoplastic versus de novo adenocarcinoma.
Main Methods:
- Immunohistochemical identification of S-phase cells using bromodeoxyuridine uptake.
- Immunohistochemical detection of proliferation-associated antigens (Ki-67, PCNA, DNA polymerase alpha).
- Analysis of Stage II abnormality (proliferation zone shift) in rectal mucosa.
Main Results:
- Hyperproliferation and Stage II abnormality are present in colorectal neoplasia but are independent.
- These abnormalities correlate with distinct clinical and pathological features.
- Cytokinetic abnormalities strongly predict the adenoma-carcinoma sequence but not de novo adenocarcinoma.
- Proliferation increases along the adenoma-carcinoma sequence, excluding early cancer.
Conclusions:
- Cell proliferation patterns are key indicators in understanding colorectal cancer development.
- Stage II abnormality and hyperproliferation are valuable predictive markers for specific colorectal cancer pathways.
- These findings aid in distinguishing between different colorectal cancer origins and progression routes.
Abstract:
Cell renewal in the large intestine mucosa is normally tied to a rigidly compartmentalized model. Immunohistochemical identification of cells in S phase through uptake of bromodeoxyuridine is the method of choice for detailed compartmental mapping of proliferation, while immunohistochemical detection of proliferation-associated antigens (Ki-67, PCNA, DNA polymerase alpha) provides information in advanced tumor cases. Mucosal hyperproliferation due to inflammation may be transient (self-limited colitis, Crohn's disease, acute radiation damage) or lasting (ulcerative colitis). Progressive shifting of the proliferation zone to the crypt surface (Stage II abnormality) is a late feature of irradiated rectal mucosa and subgroups of ulcerative colitis patients at high risk for cancer. Hyperproliferation and Stage II abnormality coexist in the mucosa of patients with colorectal neoplasia, but are mutually independent and correlated to different clinical and pathological features of the disease. These cytokinetic abnormalities are highly predictive markers of the adenoma-carcinoma sequence, but are not associated with de novo adenocarcinoma. Proliferation increases progressively in the subsequent steps of this sequence, except in early cancer.
