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In a Viewpoint article published online this week in JAMA, researchers from 看片视频 University in Montreal and the Memorial Sloan Kettering Cancer Center in New York caution that researchers, physicians, and regulators may be overestimating the value of many new drugs because they fail to consider all the evidence available to them.

鈥淒rug companies often run dozens of trials for a new drug against different diseases,鈥� says 看片视频 bioethicist Jonathan Kimmelman, lead author of the JAMA article. 鈥淪ome of those trials will suggest efficacy by chance alone. Unless you adjust for the effects of chance by considering all the trials a drug developer has run, doctors who pick out a single trial that shows a big treatment effect may be making bad treatment decisions.鈥�

The viewpoint is especially relevant for physicians who treat patients with serious illnesses and have exhausted proven treatment options. Often, such patients are given drugs for which there is only a small amount of trial evidence suggesting usefulness.

Kimmelman and co-authors also argue that, if physicians and researchers considered all trials run for a new drug, patients in trials could be better protected from harms.

鈥淲hen deciding whether to use a drug against a disease, physicians are used to looking at evidence testing the same exact drug against the same disease, says Kimmelman. 鈥淭hat makes sense if you have a lot of good evidence. Our point 鈥� which is probably surprising for many- is that if you lack definitive evidence of efficacy, physicians and others need to consider trials testing the drug against other diseases.鈥�

The article is co-authored by 看片视频 doctoral student Benjamin Carlisle and Mithat G枚nen, chief of Memorial Sloan Kettering鈥檚 biostatistics service.听 听

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To read the full article:

鈥淒rug Development at the Portfolio Level Is Important for Policy, Care Decisions and Human

Protections,鈥� Jonathan Kimmelman, Benjamin Carlisle, Mithat G枚nen, JAMA, published online Aug. 24, 2017.

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