nobel prize for medicine. james allison from the united states and tasuku honjo from japan were jointly awarded the prestigious prize after discovering how the human body's own immune system could be turned against cancerous cells. our medical correspondent fergus walsh has the story. for tasuku honjo in tokyo, it was late afternoon when celebrations began. but forjames allison in texas, the time difference meant a very early start. my son called at 5.30. then pretty soon i started getting calls from other people, and then a bunch of people came to the room, to the door. beating on the door at six in the morning with champagne. so we had a little party early this morning. the two professors discovered how to take the brakes off the immune system to fight cancer. our immune cells are there to destroy foreign invaders like viruses, but cancer cells have several ways of hiding from the body's defences. the scientists discovered some