Effects of lactoferrin, soya germ and polyamine on 2‐amino‐1‐methyl‐6‐ phenylimidazo[4,5‐b]‐pyridine(PhIP)‐ induced breast carcinogenesis in rats

The cancer-preventive effects of food-derived bovine lactoferrin(bLF), isoflavone-rich soya germ(SG), and spermidine(SPD) on mammary gland carcinogenesis induced by 2-amino-1- methyl-6-phenylimidazo[4,5-b]-pyridine (PhIP), were investigated in female Sprague-Dawley(SD) rats. Two hundred and six female SD rats were divided into 8 groups. Cumulative breast cancer incidence at 43 weeks was 65.4% in the PhIP group; 80.0% and 76.0% in the 0.2% and 2.0% bLF groups, respectively; 58.3% and 20.0% in the 2% and 10% SG groups, respectively; and 80.0% and 76.9% in the 0.035% and 0.175% SPD groups, respectively. Isoflavone-rich SG significantly suppressed breast cancer, and the tumors showed fibrous or less malignant features upon histological examination.