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Genistein and enterolactone in relation to Ki‐67 expression and HER2 status in postmenopausal breast cancer patients
Author(s) -
Jaskulski Stefanie,
Jung Audrey Y.,
Rudolph Anja,
Johnson Theron,
Thöne Kathrin,
Herpel Esther,
Sinn Peter,
ChangClaude Jenny
Publication year - 2017
Publication title -
molecular nutrition and food research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.495
H-Index - 131
eISSN - 1613-4133
pISSN - 1613-4125
DOI - 10.1002/mnfr.201700449
Subject(s) - enterolactone , breast cancer , phytoestrogens , medicine , oncology , isoflavones , cancer , genistein , ki 67 , gynecology , endocrinology , estrogen , immunohistochemistry
Scope Phytoestrogens (PE) may improve breast cancer prognosis by modifying tumor prognostic markers, such as cell proliferation marker Ki‐67 and human epidermal growth factor receptor 2 (HER2). Epidemiological evidence linking lignans and isoflavones to Ki‐67 and HER2 is limited. We examined associations between the major metabolites of lignans and isoflavones – enterolactone (ENL) and genistein (GEN) – respectively, and Ki‐67 expression and HER2 in tumor tissue of breast cancer patients. Methods and results Data from 1060 invasive breast cancer patients from the population‐based MARIE study were used. Multivariate‐adjusted linear (Ki‐67 log‐transformed) and quantile regression, and logistic regression analyses (HER2, Ki‐67 dichotomized) were performed to calculate β estimates and ORs, respectively. Median post‐diagnostic ENL and GEN concentrations were 19.5 and 4.8 nmol/L, respectively. Median Ki‐67 was 12.0%, and 21.2% of the tumors were HER2+. After adjustment, there was an inverse association between GEN and Ki‐67 at high expression levels (OR for Ki‐67 ≥20% versus <20% of 0.93 (95%CI [0.87;0.99]) per 10 nmol/L GEN increment). Conclusion Our findings indicate an inverse association between GEN and Ki‐67 at high levels of Ki‐67 expression. Additional investigations are recommended to confirm our findings and to further elucidate mechanisms linking PE metabolites to breast cancer survival.