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Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection
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Colorectal Cancer Risk With Negative Colonoscopy or Nonadherence After Positive FOBT Screening.

Hanna Heyman1,2, Deborah Saraste1,2, Håkan Jonsson3

  • 1Department of Surgery, Södersjukhuset, Stockholm, Sweden.

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|March 19, 2026
PubMed
Summary
This summary is machine-generated.

Individuals with negative colonoscopy results after a positive fecal occult blood test (FOBT) showed lower colorectal cancer (CRC) incidence. Nonadherence to colonoscopy significantly increased CRC risk, highlighting the need for personalized screening strategies.

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Area of Science:

  • Oncology
  • Gastroenterology
  • Public Health

Background:

  • Population-based colorectal cancer (CRC) screening programs are crucial globally.
  • Determining appropriate screening intervals requires understanding subsequent CRC risk based on colonoscopy outcomes.

Purpose of the Study:

  • To evaluate CRC incidence following a negative screening colonoscopy or nonadherence to colonoscopy after a positive fecal occult blood test (FOBT).
  • To inform risk-based screening interval recommendations.

Main Methods:

  • Prospective cohort study in Sweden (2008-2021) within a population-based CRC screening program using biennial FOBT.
  • Included individuals aged 60-69 with positive FOBT results, categorized by colonoscopy adherence and outcome.
  • CRC incidence was measured using standardized incidence ratios (SIR) compared to the general population.

Main Results:

  • Individuals with negative colonoscopy after positive FOBT had significantly lower CRC incidence (SIR 0.52), particularly men (SIR 0.37).
  • Nonadherence to recommended colonoscopy following a positive FOBT was associated with a markedly increased CRC incidence (SIR 4.21).

Conclusions:

  • Negative colonoscopy results correlate with reduced CRC incidence, supporting individualized, risk-based follow-up strategies.
  • Nonadherent individuals represent a high-risk group for targeted CRC interventions and improved early detection.