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Amid ongoing concerns over clinical trial transparency, a new report finds “notable gaps” in the quality and availability of clinical trial data in a European registry, pointing to inconsistent and often inadequate oversight by regulators in individual countries.

For instance, 1,207 trials were approved by regulators in France and 831 trials authorized by authorities in Poland, but do not appear in the European Union Clinical Trials Register. Approximately 90% of older trials were approved by regulators in The Netherlands, but results are not available. Overall, nearly 6,000 study results are missing across 14 countries.


“The issues range from missing protocols and results to outdated data on the current status of a given trial,” wrote University of Oxford researchers, whose findings were the basis for the report and appeared on MedRxiv preprint server that posts unpublished research. “Apparently, missing registrations are largely concentrated among a few countries, while issues with data quality are more widespread.”

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