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

Leukemia is another theme in the book. Leukemia is a disease that is the presence of abnormal cells. The name comes from "leukos." It was originally called "weisses Blut" or white blood because the disease is formed through an accelerated level of white blood cells. While leukemia is often related to children, the majority of leukemic patients are adults, like Carla Reed, whose case is presented as one of the main stories in the book.