Hundreds of billions of dollars is poured into cancer treatment and research every year. There are more effective tools to combat it than ever before, yet it kills close to ten million people every year. Stephen speaks to one of America's leading cancer specialists, Siddhartha Mukherjee. His book, The Emperor of Maladies, is a self-styled biography of cancer that paints a unique picture of the disease and weaves together memoirs, science and a writer's sensibility. Eight years on from its publication, is cancer any less of a curse? Show less