New Debate on Human Test of Stem Cells

April 11, 2008

While politicians battle over where to set limits for human embryonic stem cell studies, regulators are mulling where it should set scientific limits on the promising but controversial research.

Despite widespread media coverage, embryonic stem cells and related cells have only been implanted in a handful of human patients. Researchers say some of the experiments have shown early signs of success. Others have been failures because they were ineffective or led to tumors. (WebMD)