First attempt made to alter genes in body

OAKLAND, California - Scientists have for the first time tried editing a gene inside the body in an attempt to permanently change a person's DNA to try to cure a disease.

The experiment was done on Monday in California on 44-year-old Brian Madeux. Through an IV, he received billions of copies of a corrective gene and a genetic tool to cut his DNA in a precise spot.

"It's kind of humbling" to be the first to test this, said Madeux, who has a metabolic disease called Hunter syndrome. "I'm willing to take that risk. Hopefully it will help me and other people."