As a History of Science book, it is quite thorough, interesting, and well written. As a cell and molecular biologist I was fascinated by some of the metaphor used to explain, for example, signal transduction pathways to a lay audience. Science writing of high calibre, as the Pulitzer prize would suggest.
I think a person going through cancer treatment could educate themselves in the field quite thoroughly, if they had the courage to read this. There has been much progress in treatment in the last twenty years. Some of the earlier cancer treatments are described as reckless and brutal by the author, who is an oncologist himself.