Are clinical trials good for your health?

A: There are risks for patients who participate in clinical trials, but they may get access to the latest treatments.

The Cochrane Collaboration has therefore carried out a systematic review to see if the benefit of being in a trial outweighs the harm.

This review included studies in which patients had the same interventions within or outside of a clinical trial. It included five randomised controlled trials and 80 non-randomised cohort studies.

Most of the randomised trials only studied small numbers of