. >> reporter: dr. maude is a researcher.ngineer them in the lab then inject them back into the patient. in this video you can see the result the gray t. cell is killing the gray lee keemia sell. it's incredibly exciting. as a pediatrician seeing these children that have been so much five, ten years ago may not have survived their leukemia to see them go through this and come out to the other end and be back in school and playing and doing all the kids that kids should do, there's no greater joy as a physician. >> and in a matter of months the treatment will likely gain fda approval meaning more children around the country and world can get it. >> i think it's something that should be out there, like people should know about it. >> if it's doing wonders for us, i hope the same thing for every other family. i hope the same thing. >> reporter: now dr. maude did stop short of calling this a cure. it's working into 90 to 100% of the patients with this type of cancer. >> amazing blessing for that family. hope it doesn't hit any wa