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Population-Based Colonoscopy Screening for Colorectal Cancer: A Randomized Clinical Trial.

Michael Bretthauer1, Michal F Kaminski2, Magnus Løberg3

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Colonoscopy screening detects colorectal cancer and adenomas effectively, but participation and endoscopist performance vary. Carbon dioxide (CO2) insufflation significantly reduces post-procedure pain compared to air.

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Area of Science:

  • Gastroenterology
  • Preventive Medicine
  • Clinical Trials

Background:

  • Most European countries lack widespread colonoscopy screening due to concerns about participation, pain, endoscopist performance, and effectiveness.
  • Randomized trials investigating population-based colonoscopy screening were previously unavailable.

Purpose of the Study:

  • To evaluate the participation rate, adenoma yield, endoscopist performance, and adverse events associated with population-based colonoscopy screening across multiple European countries.
  • To provide data to inform the implementation of national screening programs.

Main Methods:

  • A population-based randomized clinical trial involving 94,959 individuals aged 55-64 at average risk for colon cancer.
  • Participants were randomized to either colonoscopy screening or no screening.
  • Outcomes included participation rates, cancer and adenoma detection, and participant experience, with comparisons made by country and endoscopist.

Main Results:

  • A 40.0% participation rate was observed (12,574 of 31,420 randomized). Significant variations in participation were noted across Poland, Norway, Sweden, and the Netherlands.
  • High detection rates for colorectal cancer (0.5%) and adenomas (30.7%), including high-risk adenomas (10.4%), were achieved.
  • Endoscopist performance varied, with some failing to meet benchmarks for cecal intubation and adenoma detection. Moderate to severe abdominal pain was reported by 16.7% with air insufflation versus 4.2% with CO2 insufflation (P < .001).

Conclusions:

  • Colonoscopy screening demonstrates high detection rates for both proximal and distal colorectal neoplasia.
  • Significant disparities exist in participation rates and endoscopist performance, highlighting the need for standardization and quality improvement.
  • Utilizing carbon dioxide (CO2) for insufflation during colonoscopy can substantially mitigate post-procedure abdominal discomfort.