What is the theme in The Emperor of All Maladies: A Biography of Cancer by Siddhartha Mukherjee?

Cancer is the main theme in this book. Siddhartha Mukherjee is a cancer researcher and physician. Mukherjee gives a brilliant and thorough examination of the history of cancer while explaining in such a way that the lay person can understand its origins and the battle to treat, prevent and cure the disease.