sidney farber was on to something. a kind of magic possession. the first chemo therapy drug. robert sandler was in the first group to receive it. here is his mother, more than 50 jeers later in a family video. >> every day to the hospital by discre streetcar, by bus. we didn't have a car. >> imagine the jubilation when it worked. within weeks, robert was back on his feet, back with the family. christmas 1948, still doing well. but it didn't last. >> and he had one month to go to be four when he died. >> robert died in the summer of 1949. nearly two full years after cancer struck. the scientific triumph that never did trump a family's pain. >> that's my bad memories of losing my son, after having him declared cured, because they used him as a guinea pig. >> i first heard this story from