During the last two decades, molecular epidemiology has become an important discipline in cancer research. It has evolved towards the development, validation and application of markers of susceptibility and, more recently, markers of mechanisms of cancer development. This volume on mechanisms of carcinogenesis covers from an interdisciplinary perspective, the contribution of molecular epidemiology to the understanding of mechanisms of carcinogenesis, and represents a further contribution to the development of molecular epidemiology as a major cancer research domain.