This Cancer Prevention book series aims to complement the research reported in the journal Cancer Causes and Control. Volumes in this series will summarize the state of the science from causes to prevention of cancer. The scope will be international. The past 20 years has seen an explosion of epidemiologic material on the causes of cancer. Examples include the growing number of studies of physical activity and colon cancer which have emerged and the numerous studies of components of diet such as alcohol and the risk of specific cancers. Major shifts in resource allocation now focus on translation of this new knowledge to actual cancer prevention