SpaceAdmiral writes, "Using human embryonic stem cells, researchers have cured a Parkinson's-like disease in rats. Unfortunately, the Parkinson's cure causes brain tumors." From the first article: "...10 weeks into the trial, [University of Rochester researchers] discovered brain tumours had begun to grow in every animal treated... By definition, human embryonic stem cells have the almost mythical, immortal power to grow and divide indefinitely as they become the various tissues that make up the body. As a result, scientists have always known that any stem cell therapy could result in an uncontrolled growth of cells that could give rise to cancer."
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