This book describes viruses that have been associated with human cancer and the roles they play in its development. It is a shame, however, that it does not mention XMRV and MCV, two viruses recently implicated in prostate- and a rare form of skin cancer, respectively. One should note that, even if a virus is shown to be necessary for cancer development, evidence indicates that it is insufficient, other chemical and physical factors being required. Viruses make a number of contributions. Many supply growth-deregulating functions while others induce immune-suppression (allowing other viruses to contribute) and some induce chronic tissue damage or inflammation that increases the probability of mutation. The book would benefit from a chapter on prevention, including a description of efforts to develop new generations of HPV vaccines. I would recommend this book to all interested in the role that viruses play in cancer development, students and experienced researchers alike. Unfortunately, its price will restrict its purchase to institutions.