Of the four studies that reported on the association with fiber from beans or legumes, only the Nurses’ Health Study II found an association, albeit marginally significant, with breast cancer risk overall 10 , 15 , 17 , 33 and no prior study has shown heterogeneity by ER/PR status 15 , 17 .
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Intake of bean fiber, beans, and grains and reduced risk of hormone receptor-negative breast cancer: the San Francisco Bay Area Breast Cancer Study.
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Similarly for bean fiber, the inverse trend was of borderline significance (p‐trend = 0.05).