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Failure to report protocol violations in clinical trials: a threat to internal validity?
Elizabeth A Sweetman1, Gordon S Doig
1University of Sydney, Sydney, Australia.
Trials
|September 30, 2011
Summary
Protocol violations (PVs) are under-reported in clinical trials. Improved reporting is needed, with the CONSORT statement recommending more explicit guidelines for all PV types to ensure patient safety and data integrity.
Area of Science:
- Clinical Trials
- Research Integrity
- Patient Safety
Background:
- Protocol violations (PVs) are preventable errors in study conduct that can harm patients and compromise clinical trial results.
- Understanding PVs and their reduction methods is crucial for reliable trial outcomes.
Purpose of the Study:
- To investigate reported PVs in clinical trials.
- To describe current practices for PV reduction.
- To explore relationships between trial characteristics and PVs.
Main Methods:
- Reviewed 80 clinical trials across various specialties from four major medical journals.
- Abstracted data on trial characteristics, PV reporting, rates, and reduction interventions.
- Categorized PVs into five types and used logistic regression to analyze associations with study characteristics.
Main Results:
- 32% of trials did not explicitly report any PVs, and none reported all five types.
- Larger trials (more patients, sites, longer duration) showed more complete PV reporting.
- Only 9% of trials reported specific PV prevention methods, primarily a run-in phase.
Conclusions:
- PVs are significantly under-reported in published clinical trials.
- The CONSORT statement needs to provide more explicit guidance on reporting all PV types.
- Enhancing PV reporting is essential for improving research integrity and patient safety.
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