FDA Approves Stem Cell Study for Spinal Injuries

The Food and Drug Administration approved the first clinical trial today that will use human embryonic stem cells to potentially draw recent paraplegics out of the wheelchair and back on their feet.

Scientists hope the stem cell therapy will prevent permanent paralysis caused by acute spinal cord injuries and even return feeling and movement in patients who suffered the paralyzing injury two weeks before treatment. The treatment showed positive results when tested in rats.

"In animal models, this restores the animal's ability to walk," Dr. Tom Okarma, president and CEO of Geron Corp., the company putting on the trial, told "Good Morning America" today. "And that's what we hope to achieve in the first trial with patients with spinal cord injury."

A group of eight to 10 paraplegics who still have use of their arms but not legs will be injected with cells derived from embryonic cells, Okarma told The Associated Press.

VIDEO: Stem Cell Breakthrough

Although the aim of the study is to test the procedure's safety, doctors will be on the lookout for much more.

"The focus of this trial is safety," Sean Morrison, director at the University of Michigan Center for Stem Cell Biology, told "GMA."

"And if Geron can show it's safe to derive stem cells into patients, that will be an important precedence to enhance future trials for all diseases that could benefit from this work from juvenile diabetes to other types of neurological disorders."

Doctors will also be on the lookout for potentially hazardous side effects. The cells could create benign tumors and there is a danger the patient's immune system could attempt to reject the injections, "thereby increasing the inflammation in the spinal cord instead of decreasing it," Morrison said.

VIDEO: Gov. Backs Human Stem Cell Testing

In response, doctors plan to provide the patients with anti-rejection drugs for two months after the initial injection, the AP reported.

If successful, supporters see nearly endless potential for the treatment.

"This is vast," said Peter Kiernan, chairman of the board of directors of the Christopher and Dana Reeve Foundation. "This is like the dawn. It's not a comet across our sky; it's the beginning."

Treatment Requires Patience

Christopher Reeve, the actor who famously portrayed Superman on the big screen before a fall off a horse caused paralysis from the neck down, championed the cause of those with spinal cord injuries until he died in 2004. Kiernan said the Man of Steel would have taken hope in the news.

"You know Chris was an impatient man," he said. "He would say 'Why have we waited so long? Let's get to work.' Today, the hard work starts."

Even if the treatment is successful, Okarma warned that patients might have to show a little more patience.

They will not "get up and dance the next day," he told the AP, but the movement the treatment hopes to provide could be improved with physical therapy.

Michigan's Morrison said that almost any amount of movement would be a tremendous breakthrough.

"It may not be realistic to hope that this kind of therapy will allow patients with severe injuries to walk again," he said. "Even if you would restore lateral function in a subset of patients, that would be a real important advance and the trial would be a huge success."

Ethics, Politics and Controversy

Though the approval for the trial is new, the ferocious ethical debate surrounding the use of stem cell therapy is anything but.

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