I have been involved in cancer research for many years. When I think about what is most important in this field,I believe it must be “cancer prevention”. Unhappily, this area has not been always sufficiently valued either byresearchers or by the general public. However, from a realistic perspective, cancer prevention is extremely importantat both an individual and collective level. This fact, I believe, will eventually be understood by society and, consequently,more effective measures will be taken. In this paper, I will introduce my views on cancer prevention, along with a fewexperimental results.