. >> reporter: and then danced with them on the great stage of radio city music hall. >> what was ite-in-a-lifetime tlhrill for dancer given a new hope for tomorrow. for "today," nbc news. >> hillary did amazing. good morning to you. >> good morning. >> st. jude celebrating 50 years. now in that time, have you all been able to keep track all of the patients over the years? how many lives have been saved? >> well, we do keep track of all of them because we have an after completion therapy program and we want to know how they're doing all the time. but we have about 7,800 active patients, 250 we see a day. but it's almost impossible to calculate because we send our doctors to china, south america, latin america, the mideast, we have these websites where doctors can be talking to us, asking questions. we give about, i think, 250 consultations a week. and they're for free, which is unusual for doctors. and then we have another website where the doctors can talk to our doctors. so we're just so spread out that millions and millions of children. >> i know you have a lot to be thankful for.