Abstract
Abstract Background The association of soybean products related with colorectal cancer risk is inconsistent. This may be due to information bias from measuring food intake by questionnaires and different degrees of bias according to study design. To assess the association between soybean products and colorectal cancer, we directly measured phytoestrogen biomarkers in a nested case-control study in Korea. Methods Study population was composed of 101 cases and 398 matched controls matched for age within 5-year, sex, area and year at recruitment of cases within the Korean Multicenter Cancer Cohort. The concentrations of four biomarkers in the plasma were measured by Liquid Chromatography-Mass Spectrometry. Conditional logistic regression models were used to calculate the odds ratio and 95% confidence intervals (CI). Results Median plasma concentrations of genistein, daidzein, glycitein and enterolactone were not statistically significant between cases and controls. However, there was a significant trend of decreasing risk according to an increase of genistein (p=0.03). This protective effect of genistein was more prominent in women. There was no association between other plasma concentrations of isoflavones or lignans and colorectal cancer. Conclusions High serum concentrations of isoflavones, i.e, genistein, were associated with a decreased trend of colorectal cancer, especially in women. Citation Format: Yohwan Yeo, Kwang-Pil Ko, Seung-Hyun Ma, Jae Jeong Yang, Aesun Shin, Sue K. Park, Soung-Hoon Chang, Hai-Rim Shin, Daehee Kang, Keun-Young Yoo. Isoflavones from phytoestrogens and colorectal cancer risk: A nested case-control study within the Korean Multicenter Cancer Cohort. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 4823. doi:10.1158/1538-7445.AM2013-4823
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