Ground - based TV documentary followed three children in medical trials . They were the first in Britain to have pioneering treatment immunotherapy . It uses powerful drugs to kill off tumor cells and bone bone tumors . Toxicity of immunotherapy means children often have to be sedated . In the film , the children 's parents reveal why they decided to take part . The documentary , entitled In My Heart , will be shown on ITV on April 15 . Raining In My Heart will be shown on ITV on April 15 .
Ground-breaking TV documentary followed three children in medical trials . They were the first in world to have pioneering treatment immunotherapy . It uses powerful drugs to kill off cancer cells and destroy bone marrow . Toxicity of immunotherapy means children often need to be sedated . In the film , the children 's parents reveal why they decided to take part . The documentary , Raining In My Heart , will be shown on ITV on April 15 . Raining In My Heart will be shown on ITV on April 15 .