At the age of 10, Deryn Blackwell was diagnosed with leukaemia and two years later developed a rare form of cancer called Langerhans cell sarcoma. After four unsuccessful bone marrow transplants he was given just days to live, but somehow Deryn battled his way back from the brink and has since made a full recovery. Deryn’s mother Callie revealed that she had been giving him medicinal cannabis and credits it with saving Deryn's life.
Broadcast on 27/03/2017
