If it is a textbook on cancer biology that you are looking for, then I can assure you that there is nothing else that is gonna be better than this book.
It is not just comprehensive but it also takes you back in time into the historical experiments that were conducted on cancer and explain it to you the way in which we have arrived at the current understanding of what cancer is.
The plus point – There are loads of mind blowing illustrations and micrographs that will make things easier for you to understand. So, it is way more than a usual textbook. I found it like a work of literature, just that it is scientific.