Soy Isoflavones, Estrogen Therapy, and Breast Cancer Risk
Author Information
Author(s): Mark J Messina, Charles E Wood
Primary Institution: Nutrition Matters, Inc; Wake Forest University, School of Medicine
Hypothesis
Do isoflavones from soyfoods increase breast cancer risk in women?
Conclusion
There is little clinical evidence to suggest that isoflavones will increase breast cancer risk in healthy women or worsen the prognosis of breast cancer patients.
Supporting Evidence
- Most studies show no increase in breast cancer risk associated with soy isoflavone intake.
- Clinical trials have not demonstrated significant effects of isoflavones on breast cell proliferation.
- Epidemiologic data suggest a protective role of soy intake in breast cancer risk among Asian women.
Takeaway
Eating soy foods is generally safe for women and doesn't seem to increase the risk of breast cancer, even though some people worry it might.
Methodology
The analysis reviews clinical trial data and epidemiologic evidence regarding the effects of isoflavones on breast cancer risk.
Potential Biases
Potential bias exists due to the involvement of authors with connections to the soy industry.
Limitations
The research is limited by small sample sizes and the short duration of some studies.
Participant Demographics
The studies included both healthy women and breast cancer patients, primarily postmenopausal.
Digital Object Identifier (DOI)
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