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For years, researchers have urged regulators to release clinical study reports that are generated during clinical trials in order to support further research and improve care. Now, a new study offers evidence why this is a good idea: There were more harmful side effects found in clinical study reports than listings in corresponding trial registries or published studies.

The authors examined 42 trials of cancer medicines that were submitted by drug makers to the European Medicines Agency between 2015 and 2018, and then looked at the available data concerning the side effects caused by 13 of the treatments. They compared information contained in clinical study reports, which contain trial methods and other data, with government registries and journal publications.

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