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Dietary isoflavone intake among breast cancer survivors and cancer-free women
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Type
Academic journal
Author
Sihan Song (Seoul National University) Hyeong-Gon Moon (Seoul National University College of Medicine) Dong-Young Noh (Seoul National University College of Medicine) So-Youn Jung (National Cancer Center) Eun Sook Lee (National Cancer Center) Zisun Kim (Soonchunhyang University College of Medicine)
Journal
The Korean Nutrition Society Nutrition Research and Practice Vol.19 No.1 KCI Accredited Journals SCIE
Published
2025.2
Pages
80 - 95 (16page)

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Dietary isoflavone intake among breast cancer survivors and cancer-free women
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BACKGROUND/OBJECTIVES: Isoflavones are estrogen-like compounds found in plants and their health effects remain equivocal. We investigated dietary isoflavone intake and its associated factors in Korean breast cancer survivors, with a comparison to cancer-free women.
SUBJECTS/METHODS: The usual dietary intake of breast cancer survivors (n = 981, mean age 52 yrs) in 9 hospitals between 2012 and 2019 was assessed using 3-day food records or food frequency questionnaires (FFQs). They were age-matched to 2,943 cancer-free women who completed FFQs as part of a nationwide study conducted between 2012 and 2016. We used the flavonoid database of common Korean foods and the Phenol-Explorer database to estimate isoflavone intake. The contribution of each food or food group to the total isoflavone intake was calculated. The adjusted least-squares means of dietary isoflavone intake according to lifestyle and clinical factors were calculated using generalized linear models.
RESULTS: Breast cancer survivors had a higher mean dietary isoflavone intake (23.59 mg/day) than cancer-free women (17.81 mg/day). Major food sources, including tofu, soybeans, and doenjang, contributed to over 70% of the isoflavone intake in both groups. When we Nutr Res Pract. 2025 Feb;19(1):80-95 https://doi.org/10.4162/nrp.2025.19.1.80 pISSN 1976-1457·eISSN 2005-6168 Dietary isoflavone intake among breast cancer survivors and cancer-free women Sihan Song 1,2, Hyeong-Gon Moon 3, Dong-Young Noh 3, So-Youn Jung estimated dietary isoflavone intake according to lifestyle characteristics, isoflavone intake increased with higher scores of adherence to the American Cancer Society dietary guidelines but decreased with increasing body mass index in both groups. Among cancer-free women, dietary isoflavone intake was higher among those who had never smoked and among dietary supplement users. Among breast cancer survivors, dietary isoflavone intakes did not vary with clinical characteristics, including time since surgery and estrogen receptor status.
CONCLUSION: Breast cancer survivors were more likely to consume isoflavones than age- matched cancer-free women. Dietary isoflavone intake was associated with healthy lifestyle characteristics in women both with and without breast cancer. Further research is needed to understand the role of the higher isoflavone intake among breast cancer survivors compared to cancer-free women on their prognosis.
#Isoflavones #soy foods #breast cancer

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INTRODUCTION
SUBJECTS AND METHODS
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