Prediagnostic Level of Dietary and Urinary Isoflavonoids in Relation to Risk of Liver Cancer in Shanghai, China

No epidemiologic studies have directly assessed the association between dietary and urinary isoflavonoids and risk of liver cancer in humans.A nested case-control study, including 217 incident cases of liver cancer and 427 individually matched control subjects, was conducted in Shanghai, China. Dietary isoflavonoid intakes were assessed through a validated food-frequency questionnaire and the Chinese Food Composition Tables. Urinary excretion...