"Good Morning America" co-anchor Robin Roberts underwent a bone marrow transplant Thursday to treat MDS, a bone marrow disorder that affects blood cells production.
The transplant was a five-minute procedure in which the donor cells from Robin's sister, Sally-Ann, were injected into Robin's system through a syringe.
"Nobody can believe it," Dr. Gail Roboz, the New York-Presbyterian Hospital/Weill Cornell Medical Center oncologist who is treating Robin, said today on "GMA" of the short procedure.
"People have in their mind all kinds of images of what can happen in a transplant but it's still an incredibly powerful moment," she said. "Inside of that syringe are millions and millions of stem cells that are now circulating around and trying to find their home and start growing which is what we're going to be looking for over the next couple of weeks."
As she underwent the transplant Robin was surrounded by her siblings and other loved ones, including "World News" anchor Diane Sawyer and "GMA"'s weather anchor, Sam Champion.
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"It was an emotional, scary and yet exhilarating moment, one that I'll never forget," Champion said.
Robin faced the procedure with grace, strength and humor. For 10 days prior to the transplant, she endured rigorous chemotherapy treatments to prepare her system to accept her sister's cells.