10-Year-Old Diagnosed With Breast Cancer Is "Triple Negative. It's Environmental."Margaret Hartmann10/09/09 1:40pm64EditPromoteGo to permalinkToday Good Morning America checked in with 11-year-old Hannah Powell-Auslam, the youngest person diagnosed with breast cancer. GMA celebrated Hannah completing chemotherapy treatment by giving her American Girl dolls and introducing her to the Jonas Brothers. Clip at left.