Investigations suggest that, in some fields, at least one-quarter of clinical trials might be problematic or even entirely made up. Faked or unreliable trials are dangerous, as they could end up being included in the reviews that help inform clinical treatments. However, the extent of the problem in unclear, and many researchers urge stronger scrutiny.

This is an audio version of our Feature: Medicine is plagued by untrustworthy clinical trials. How many studies are faked or flawed?

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