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Related Concept Videos

Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

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...
Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
Inflammatory Bowel Disease II: Crohn's Disease01:30

Inflammatory Bowel Disease II: Crohn's Disease

Introduction
Inflammatory bowel disease, commonly known as IBD, refers to a collection of disorders that lead to persistent inflammation of the gastrointestinal tract. The two types of IBD are ulcerative colitis, which impacts the colon, and Crohn's disease, which can involve any part of the gastrointestinal segment.
Crohn's disease
Crohn's disease is a chronic, systemic inflammatory bowel disease (IBD) that predominantly affects the gastrointestinal tract. It is marked by transmural...
Inflammatory Bowel Disease I: Introduction01:26

Inflammatory Bowel Disease I: Introduction

Inflammatory bowel disease is a group of chronic disorders marked by recurrent inflammation of the gastrointestinal tract due to an abnormal immune response against gut microflora. This leads to tissue damage. The two main forms are Crohn’s disease and ulcerative colitis.Crohn’s DiseaseCrohn’s disease is a relapsing inflammatory disorder that can affect any part of the GI tract, from the mouth to the anus. It involves all layers of the bowel wall (transmural) and shows “skip lesions” in which...
Inflammatory Bowel Disease II: Ulcerative Colitis01:20

Inflammatory Bowel Disease II: Ulcerative Colitis

Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
Inflammatory Bowel Disease IV: Clinical Manifestations01:20

Inflammatory Bowel Disease IV: Clinical Manifestations

Inflammatory bowel disease (IBD) encompasses two major chronic disorders—ulcerative colitis and Crohn’s disease—each characterized by relapsing episodes of gastrointestinal inflammation. Although they share certain clinical features, their patterns of involvement and manifestations differ in ways that aid diagnosis and guide management.Ulcerative ColitisUlcerative colitis is limited to the colon and rectum and involves continuous inflammation of the mucosal layer. The disease course is marked...

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Related Experiment Video

Updated: May 8, 2026

Murine Appendectomy Model of Chronic Colitis Associated Colorectal Cancer by Precise Localization of Caecal Patch
08:51

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Published on: August 24, 2019

Cancer morbidity in ulcerative colitis

P Prior, S N Gyde, J C Macartney

    Gut
    |June 1, 1982
    PubMed
    Summary

    Patients with ulcerative colitis face an 11-fold increased risk of colorectal cancer, particularly those diagnosed before age 30. This study highlights the crucial link between colitis and cancer development over time.

    Area of Science:

    • Gastroenterology
    • Oncology
    • Epidemiology

    Background:

    • Ulcerative colitis (UC) is a chronic inflammatory bowel disease.
    • Long-term UC patients have an increased risk of cancer, especially colorectal cancer.
    • Understanding cancer risk patterns in UC is crucial for patient management.

    Purpose of the Study:

    • To investigate cancer morbidity in a cohort of 676 ulcerative colitis patients.
    • To examine the level and pattern of cancer risk over time.
    • To determine the association between ulcerative colitis and cancer, particularly colorectal cancer.

    Main Methods:

    • Analysis of cancer morbidity in 676 ulcerative colitis patients.
    • Comparison of observed cancer incidence with expected rates using age-, sex-, and site-specific data.

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  • Calculation of relative risk for colorectal cancer, adjusted for surgical resection and patient exclusion criteria.

    • Main Results:

    • A significant overall excess of cancers was observed, primarily in the digestive system.
    • An 11-fold excess risk of colorectal cancer was found in UC patients compared to the general population.
    • Cumulative probability of developing colorectal cancer reached 8% at 25 years post-UC diagnosis.
    • Higher relative risk of colorectal cancer was associated with earlier age of colitis onset (before 30).

    Conclusions:

    • There is a significant association between ulcerative colitis and an increased risk of digestive system cancers, especially colorectal cancer.
    • The risk of colorectal cancer in UC patients is strongly related to the age at onset of colitis.
    • Early-onset colitis (<30 years) confers the highest risk, emphasizing the need for vigilant surveillance.