As a biomedical researcher, I'm glad to finally see some of the promises of stem cells. However, this must be tempered by knowing that there exists a fine line between stem cells and cancer cells. Both grow outside of the normal controls that keep excess cell division in check. For stem cells, this is developmentally controlled by the neighboring cells. I wonder how these stem cells will respond when moved to a new environment and what the long term effects will be. I guess that FDA sanctioned or not, we're going to find out.