First, in the interest of full disclosure, I'll note that I am Dr. Sompayrac's cousin. But don't let that dissuade you -- I have no trouble giving a bad review of a work if I think it deserves such (see my review of "What the Anti-Federalists Were For" as an example).
Like his previous work "How Pathogenic Viruses Work", Lauren has done a very good job is tacking a complex science and distilling it into a very readable book. His approach to the topic (breaking down normal and abnormal cell division, how DNA mutations arise, relating the multiple mutations required for malignancy, etc.) make the topic understandable to even laymen (which I am one).
For non-professionals seeking to understand cancer (and we all know or loved someone who has had it), this book brings a great deal of perspective. Lauren lists common forms of cancer (leukemia, breast/prostate, lung, etc.) in ways that help us understand the differences in types of cancers, how they may be caused, and why cures are difficult to architect.
Though not as entertaining as his "virus" book (which was more interesting due to the nearly endless variety of viruses and their survival mechanisms), his "cancer" book was equally well thought-out, and almost as well written.
I would recommend this work for two audiences: pre-med students and those considering a career in medicine, and laymen who are hungry for knowledge about cancer. If you survived high school biology and genetics-101, very little of this book will be over your head.