it is a breakthrough thanks to the fundraising efforts of determined father and the doctors at children's national medical center. jennifer griffin has more. >> it's the worst thing a father or mother can hear for. >> federico was just nine years old when he was first diagnosed with a life altering brain tumor. until the discovery he lived a healthy life in brazil. love to read. his father fernanda said he read every kissimmee receipt novel. it's sad to see a kid suffering from cancer particularly because they have their whole life ahead of them very. >> but do let plus thomas is the most common form of brain cancer in children. 500 new cases are diagnosed in the u.s. each year. the current treatment developed in the '80s leaves the kids with lifelong cognitive and develop mental problems. >> technology and medicine have evolved tremendously in the past decades. but not for kids with brain tumors for.