There are some types of childhood leukemia where chemotherapy and radiation don't work. These cancers are often fatal, even with aggressive treatment. Now, doctors are turning to experimental stem cell therapies to give kids a fighting chance. Adolfo Gonzalez will never forget the day his 2-year-old son was born. The excitement turned to devastation one year later when a doctor diagnosed little Adolfo with a rare form of leukemia called JMML.