What is the theme in Death Be Not Proud: A Memoir by John Gunther?

Death is a a major theme in this book. The title of the book is Death Be Not Proud, and the author states clearly that the book was written to help others going through similar situations. It offers a detailed glimpse of how brain tumors affect patients, and how brain tumors were treated back in the 1940s. The family and the doctors faced death fighting. Johnny's parents try to shield their son from knowing that he was going to die, but at times he acted as if he knew it anyway. He wrote about how much he had to do before death, and he speculated on religion, even writing his own prayer.