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Most centers claimed to deliver cells intravenously, researchers report in JAMA Internal Medicine.

“This approach has been associated with complications such as stroke, in which infused cells block blood vessels in the brain,” said Douglas Sipp, a researcher at the RIKEN Center for Developmental Biology in Kobe, Japan, who wasn’t involved in the study.

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“The biggest risk is that patients will waste their money, time and hopes on an unnecessary and useless invasive procedure,” Sipp said by email.

If any stem cell treatment did ultimately prove safe and effective enough to win FDA approval, it would likely offer a significant improvement over the limited treatment options currently available, said Leigh Turner, a researcher at the University of Minnesota Center for Bioethics, who also wasn’t involved in the study.

Related: Feel It in Your Bones: Regrowth Is Possible

But it’s impossible to say what patients would get at unregulated clinics offering unapproved stem cell therapies, Turner said by email. In at least two cases unrelated to the current study, patients died after getting stem cell procedures at a clinic in Florida, and in another case at a different Florida clinic, a woman went blind, she noted.

“Clinics marketing stem cell treatments to patients suffering from heart failure might be administering anything from slurries of mixed cells, some of which might be stem cells, to nothing more than cellular debris,” Turner said. “Often one can only speculate.”

This Fox News piece is used by permission; it also appeared in Reuters. 

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