Leaders | Moving the needle

How to improve clinical trials

Involving more participants can lead to new medical insights

Four test tubes in the shape of human figures, connected hand in hand, partially filled with a blue liquid. A dropper adds some liquid to the last figure
Illustration: Nathalie Lees

Last year Roche, a Swiss pharmaceutical firm, published a review of the clinical trials on neurological drugs it had held between 2016 and 2021. It found that black people were under-represented in all but one. Surprisingly, that news represents progress, because it shows that trial organisers are becoming more aware of a dangerous bias that sets back the safety and efficacy of medical treatments.

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This article appeared in the Leaders section of the print edition under the headline “Moving the needle ”

From the January 18th 2025 edition

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