After joining a clinical trial at Boston Children's Hospital, seven-year-old Katie Mills started to speak in complete sentences for the first time, her 30-second attention span extended into minutes, and she was finally able to retain information from one day to the next, said her mother, Susan Mills.

"We'd had a child who had basically been 2 years old for four years," said Mills, of Whiteville, N.C. But after four months, "she was communicating in ways she had never done before. It was amazing. It was like it was a totally different child."

(READ the story in the Boston Globe)