However, there are reports that soy sauce has anticarcinogenic
effects. Benjamin et al. (19) showed that feeding
Japanese style fermented soy sauce with or without nitrite to
mice in the tumor initiation stage inhibits benzo[a]pyrene
(BP)-induced forestomach neoplasia. BP is a strong carcinogen
and is present in cigarette tar and the burnt parts of
foods. Giving a diet containing soy sauce to mice inhibits
BP-induced forestomach neoplasia (Fig. 3).