Tumors Develop in Boy Treated with Fetal Stem Cells

A Russian boy who received human fetus neural stem cells has developed tumors along the brain and spine. The boy is being treated for a neurodegenerative disease known as ataxia telangiectasia. Tumor formation has been observed in animal studies after fetal stem cells transplantation and is a major concern in human trials using stem cells from human embryos. This is the first reported case of tumors in a human treated with fetal stem cells. So far.