1. Unit of Endogenous Cancer Risk Factors, International Agency for Research on Cancer, Lyon, France, Department of Biochemistry, Kyoto Prefectural University of Medicine, Kyoto, Japan, Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, Hawaii 96822, and Unit of Gene Environment Interactions, International Agency for Research on Cancer, Lyon, France