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Less than half of US clinical trial results are reported on ClinicalTrials.gov in accordance with US law, according to a recent study in The Lancet.
Of the 4209 trials due to report results by January 2018, only 40.9% did so within the 1-year deadline, and 36.1% of the trials were still unreported by September 2019. Surprisingly, US government-sponsored trials had the lowest compliance. The authors blamed lack of enforcement.
A separate Scienceinvestigation backed up the findings. Of the more than 4700 trials the publication examined, 55.3% were reported late or not at all.
Slomski A. Despite Law, Most Clinical Trial Results Still Not Posted. JAMA. 2020;323(12):1124. doi:10.1001/jama.2020.2814
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