Chemoprevention of human prostate cancer by oral administration of green tea catechins in volunteers with high-grade prostate intraepithelial neoplasia: a preliminary report from a one-year proof-of-principle study - Bettuzzi, S; Brausi, M; Rizzi, F; Castagnetti, G; Peracchia, G; Corti, A (Cancer Res, 2006)