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The modern era’s dramatic advances in medical care relies on more than scientists, doctors and biomedical companies. None of it could come to fruition without patients willing to risk trying experimental therapies to see if they are safe and effective.

More than 220,000 clinical trials are taking place worldwide, with more than 81,000 of them in the United States, according to the federal government’s registry, clinicaltrials.gov. That poses a huge challenge for recruitment.

Companies are offering a variety of inducements to coax patients into taking part. Some rely on that good old standby, cash. Others remove obstacles. Axovant Sciences, which is preparing to test an Alzheimer’s drug, is offering patients transportation from the ridesharing service Lyft.

In addition, non-cash rewards such as iPads, opt-out enrollment in low-risk trials or even guaranteeing patients they will be informed about the clinical trial results should be considered, say a group of researchers who suggest testing these incentives scientifically.

In an article published Wednesday in Science Translational Medicine, the researchers present a matrix of these options, their benefits, and potential drawbacks. They urge...