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Updated: May 30, 2026
08:40
Chronic Salmonella Infection Induced Intestinal Fibrosis
Published on: September 22, 2019
Inflammatory bowel disease and colon cancer
Noor Jawad1, Natalie Direkze, Simon J Leedham
1Blizard Institute of Cell and Molecular Science, Bart's and The London School of Medicine and Dentistry, Queen Mary, University of London, UK.
Summary
Inflammatory bowel diseases (IBD) increase cancer risk due to chronic inflammation. Understanding the unique carcinogenesis pathway in colitis-associated colorectal cancer (CACRC) is crucial for developing effective biomarkers and treatments.
Area of Science:
- Gastroenterology
- Oncology
- Molecular Biology
Background:
- Inflammatory bowel diseases (IBD), including Crohn's disease and ulcerative colitis, stem from aberrant host responses to gut microbiota.
- Chronic inflammation and tissue repair in IBD elevate the risk of developing cancer, particularly colitis-associated colorectal cancer (CACRC).
- Genetic susceptibility loci have been identified, but the specific carcinogenesis pathway in CACRC remains less understood than in sporadic colorectal cancer.
Purpose of the Study:
- To elucidate the carcinogenesis pathway in colitis-associated colorectal cancer (CACRC).
- To highlight the role of epigenetic modifications in inflammation-induced carcinogenesis.
- To discuss current surveillance methods and the need for novel biomarkers in IBD patients at high risk for cancer.
Main Methods:
- Review of existing literature on IBD, CACRC, genetic mutations, and epigenetic changes.
- Analysis of clonal ordering experiments to understand the timing of genetic alterations.
- Discussion of chemopreventive strategies and emerging biological therapies.
Main Results:
- Colitis-associated colorectal cancer (CACRC) development involves chromosomal instability, common genetic mutations, and epigenetic alterations like DNA methylation and histone modification.
- Clonal expansion of mutations can lead to 'field cancerization,' a precursor to CACRC.
- ASA compounds are the most studied and effective chemopreventive agents, while biological therapies are expanding.
Conclusions:
- Colitis-associated colorectal cancer (CACRC) exhibits distinct etiology, carcinogenesis pathways, and clinical behavior compared to sporadic colorectal cancer.
- Further research, including long-term follow-up of patients on biological therapies, is essential for improving the detection and treatment of these inflammation-induced malignancies.
- Development of clinically applicable biomarkers is a research priority for surveillance in high-risk IBD patients.
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