Human embryonic stem cells clinical trials
The Food and Drug Administration (FDA) approved the first clinical trial in the United States involving human embryonic stem cells on January 23, 2009. Geron Corporation, a biotechnology firm located in Menlo Park, California, originally planned to enroll ten patients with spinal cord injuries to participate in the trial. The company hoped that GRNOPC1, a product derived from human embryonic stem cells, would stimulate nerve growth in patients with debilitating damage to the spinal cord. The trial began in 2010 after being delayed by the FDA because cysts were found on mice injected with these cells, and safety concerns were raised.