IARC Handbooks of Cancer Prevention
Iarc Working Group on the Evaluation of Cancer Preventive Agents
Over the past twenty years, there has been an intense interest in stud ying vitamin A as an active chemopreventive agent. Observational epide miological studies have not shown consistent cancer-preventive effects . Vitamin A, often in combination with other compounds, has been studi ed in several randomized trials. Overall, there is little evidence tha t supplementation for a few years would reduce the risk of any type of cancer. This book sum...