…[T]he clinic should have known better. “It’s just not a professional thing to take an unproven intervention and inject it in both eyes,” says Leigh Turner, a bioethicist at the University of Minnesota, who tracks stem-cell clinics. Kuriyan says that injecting both eyes and asking patients to pay out of pocket for their treatment are both highly unusual for clinical trials. “Those are all big red flags,” he says. A better approach, he says, would have been to test the injections in animals for safety first.
It’s unclear exactly why the stem-cell injections caused such a bad reaction in these women. Perhaps the stem cells had differentiated into cells that formed a membrane and then contracted, peeling the retina away from the rest of the eye. Or perhaps there was scarring caused by immune cells, which are part of the mix of cells in fat that can be injected along with stem cells into the eye.
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