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Use of isoflavone supplements is associated with reduced postmenopausal breast cancer risk

  [ 1 vote ]   [ 1 Comment ]
By B.A. Boucher et al.. • www.ProHealth.com • August 11, 2013


Editor's Note: Isoflavones are organic compounds, commonly found in soy. Because these compounds may contain phytoestrogens (plant-based hormones), they have been extensively researched for possible effects on breast cancer. While some studies have found that isoflavones have no effect on the incidence of breast cancer, others have shown a decrease of up to 35% in populations which regularly consume isoflavones. This study found a significnt reduction in post-meopausal cancer risk among women taking isoflavone supplements.

By B.A. Boucher et al..

Abstract

Botanical supplements are widely used and contain diverse ingredients, including isoflavones. Food-based isoflavones have been associated with reduced breast cancer risk. However, no study has comprehensively evaluated supplements identified by isoflavone content and breast cancer risk.

Associations between ever use of 28 isoflavone supplements and breast cancer risk in Ontario, Canada were evaluated using cases (n = 3,101) identified in 2002-2003 from the Ontario Cancer Registry and controls (n = 3,471) identified through random digit dialing methods. Multivariate logistic regression was used to estimate age-adjusted odds ratio (AOR) and 95% confidence intervals (CI).

Several individual supplements were associated with reduced breast cancer risk (e.g., Natural HRT; AOR = 0.39; 95% CI: 0.22, 0.69; n(users) = 58). Use of any isoflavone supplements was associated with reduced risk when 3 or more were ever used (AOR = 0.68; 95% CI: 0.54, 0.86; n(users) = 332; p(trend) = 0.008) or any was taken >5 years (AOR = 0.75; 95% CI: 0.60, 0.94; n(users) = 325; p(trend) = 0.01); high content supplements were consistently associated with reduced risk. Risk reduction was confined to postmenopausal breast cancer for both individual and combined supplements, and was strongest in the latter among high content users who ever took 3 or more supplements (AOR = 0.55; 95% CI: 0.38, 0.81; n(users) = 118; p(trend) = 0.04) or any >5 years (AOR = 0.47; 95% CI: 0.27, 0.81; n(users) = 60; p(trend) = 0.03). Associations did not differ by estrogen-progesterone tumor receptor status.

In conclusion, isoflavone supplements were associated with decreased postmenopausal breast cancer risk. Further research to examine these novel findings is warranted, given the low supplement use and potential limitations of our results.

Source: Int J Cancer. 2013 Mar 15;132(6):1439-50. doi: 10.1002/ijc.27769. Epub 2012 Sep 18. Boucher BA, Cotterchio M, Anderson LN, Kreiger N, Kirsh VA, Thompson LU. Prevention and Cancer Control, Cancer Care Ontario, Toronto, ON, Canada. beatrice.boucher@cancercare.on.ca





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Article Comments Post a Comment

Breast cancer & soy/isoflavones
Posted by: reginakay
Aug 12, 2013
Please be careful in your research. Soy/isoflavones/hormones are the LAST thing the majority of women with breast cancer need. Breast cancer is usually hormone receptor positive (75-80%) and these compounds actually feed the cancer.
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