This study is in agreement with other epidemiological prospective studies suggesting that high soy intake in Asian women (around 25 and 50 mg of isoflavones) starting earlier in life shows a significant trend of breast cancer risk reduction; however, studies with Western women consuming a low soy diet do not show a significant association between dietary isoflavone exposure and breast cancer risk ( Wu et al., 2008a ; Dong and Qin, 2011 ).
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