Nathan, who turns 2 next month, was born with the hemispheres of his brain fused. He is physically and mentally handicapped.

DeVivo is among a growing number of Americans spending up to $75,000 in the hope that clinics in developing countries have realized the dream of regenerative medicine: using stem cells to fix the so-far unfixable.

From Guatemala to Ukraine, dozens of stem-cell purveyors are selling that dream over the Internet. They say they are helping patients whom mainstream medicine cannot. And they purport to treat a stunning list of illnesses, especially incurable conditions such as Parkinson's, cerebral palsy and paralysis.   Read More...