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Fecal Occult Blood Screening Outcomes Adjusted for Contamination Bias and Nonadherence

JAMA Network Open·August 20Open Access
Medicine, General & InternalPractice changingColorectal CancerProspective Cohort StudyColorectal Cancer ScreeningOlder AdultFecal Occult Blood Test

Summary

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What was studied

This prospective cohort study (n=376,511; Stockholm-Gotland, Sweden, 2008–2021) evaluated CRC-specific mortality reduction associated with invitation to and participation in biennial FOBT screening among adults aged 60–69, adjusting for contamination bias (late-diagnosed CRC deaths) and nonadherence.

Key findings

After bias adjustment, invitation to FOBT screening was associated with a 26% reduction in CRC mortality (RR 0.74; 95% CI, 0.58–0.94); after further adjustment for nonadherence, actual participation was associated with a 43% reduction (RR 0.57; 95% CI, 0.40–0.80).

Study limitations

- The control group was not a pure unexposed group — some received invitations between 2013–2015, requiring additional statistical correction. - Adjustments for contamination and nonadherence relied on modeling assumptions that may introduce uncertainty. - The study population was limited to one Swedish region (60–69 age group), which may limit generalizability to other settings or age ranges.

Clinical implications

FOBT screening meaningfully reduces CRC mortality — but the benefit is larger than unadjusted analyses suggest, with participation (vs. mere invitation) nearly doubling the reduction. Clinicians should prioritize strategies that boost actual screening uptake, not just program enrollment.

Caveats

  • Age group tagged as 'older_adult' based on the 60–69 year study population; this range overlaps with standard adult screening ages and may not reflect all guideline-recommended populations.
  • The control group was not fully unexposed — a subset received FOBT invitations between 2013–2015, complicating direct comparison and requiring statistical correction.
  • The impact_flag 'practice_changing' reflects the magnitude of bias-adjusted benefit (43% mortality reduction with participation) and the policy implications for uptake strategies, but this is a single-region observational study.

Related Questions

Explore related topics

How does FOBT screening compare to colonoscopy for reducing colorectal cancer mortality?What interventions most effectively improve colorectal cancer screening adherence in population-based programs?How should contamination bias and nonadherence be accounted for when evaluating cancer screening programs?

Publication Details

Year
2026
Journal
JAMA Network Open
Sample Size
n=376,511
Source
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