Mice that had been genetically engineered to develop prostate cancer showed far fewer cancerous lesions after early and lifelong exposure to dietary tomato powder, soy germ, or both, compared with mice who consumed no such substances.

Mice aged 4 to 18 weeks received 10% whole tomato powder, 2% soy germ, tomato powder plus soy germ, or no tomato or soy (control diet). PCa developed in all control mice compared with 45% of mice fed both foods, 61% of the tomato-only mice, and 66% of the soy-only mice, researchers reported in Cancer Prevention Research (2013;6:548-557).