Hannah Powell-Auslam, a 10-year-old girl from Fullterton, California, has become the youngest person to be diagnosed with breast cancer. The fifth grader has undergone a mastectomy to treat her stage IIA invasive ductal carcinoma. Experts say there is only a 0.1 percent chance of a child developing breast cancer, and when they do it is usually an entirely different form of the disease. Hannah's doctors say she may carry the breast cancer gene, or it may be that early puberty brought on damage...