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Related Concept Videos

Inflammatory Bowel Disease III: Crohn's Disease01:25

Inflammatory Bowel Disease III: Crohn's Disease

Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
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 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 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 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 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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Laszlo Herszenyi1, Pal Miheller, Zsolt Tulassay

  • 1Semmelweis University, Second Department of Medicine, Hungarian Academy of Science, Clinical Gastroenterology Unit, Budapest, Hungary. hersz@bel2.sote.hu

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Area of Science:

  • Gastroenterology and Oncology
  • Inflammatory Bowel Disease Research
  • Colorectal Cancer Etiology

Background:

  • Patients with longstanding ulcerative colitis (UC) and Crohn's disease (CD) have a significantly increased risk of developing colorectal cancer (CRC).
  • Colorectal cancer (CRC) represents a substantial cause of mortality, accounting for approximately 15% of all deaths in patients with inflammatory bowel disease (IBD).
  • The molecular pathogenesis of CRC in IBD differs from the conventional adenoma-to-carcinoma sequence, often arising from flat dysplastic lesions.

Purpose of the Study:

  • To summarize the current understanding of colorectal cancer (CRC) risk in patients with inflammatory bowel disease (IBD).
  • To identify key risk factors associated with CRC development in IBD patients.
  • To discuss the current limitations and future directions in CRC surveillance for IBD.

Main Methods:

  • Review of existing literature on colorectal cancer (CRC) risk in inflammatory bowel disease (IBD).
  • Analysis of epidemiological data regarding CRC incidence and mortality in UC and CD patients.
  • Evaluation of risk factors, including disease extent, duration, and patient-specific characteristics.

Main Results:

  • The annual risk of CRC in IBD patients increases by 0.5-1% after 8-10 years of diagnosis.
  • Factors such as young age at onset, extensive colitis, high inflammatory burden, primary sclerosing cholangitis, and family history of CRC elevate risk.
  • Pancolitits carries the highest risk, while proctitis has minimal risk, and left-sided colitis has intermediate risk; CRC risk in colonic CD mirrors UC.
  • Colonic dysplasia is a recognized precursor to CRC in IBD.
  • Current evidence does not conclusively support that surveillance colonoscopy prolongs survival in extensive colitis.

Conclusions:

  • Colorectal cancer (CRC) surveillance in inflammatory bowel disease (IBD) requires careful consideration of individual risk factors.
  • The unique pathway to CRC in IBD necessitates ongoing research into effective screening and early detection methods.
  • Emerging endoscopic and molecular techniques show promise for augmenting conventional surveillance strategies in IBD patients at high risk for CRC.