Researchers Dr. Pamela J. Magee from the University of Ulster and Dr. Ian Rowland from the University of Reading (United Kingdom) extensively reviewed the evidence related to soyfood consumption and breast cancer risk (2). They looked at studies focusing on prevention as well as prognosis in women who have had breast cancer. Highlights of their findings include the following:
- Population studies suggest that soy consumption at levels similar to Asian intake is associated with a reduction in breast cancer risk of approximately 10–20 percent.
- Soy intake does not appear to have an adverse effect on breast cancer prognosis or recurrence and may actually reduce the risk of recurrence and mortality.
- Soy does not appear to interfere with tamoxifen or anastrozole (an aromatase inhibitor) therapy.
- Women at increased risk of breast cancer due to certain genetic makeups may especially benefit from high soy intake.
1. Patriarca MT, Barbosa de Moraes AR, Nader HB, et al. Hyaluronic acid concentration in postmenopausal facial skin after topical estradiol and genistein treatment: a double-blind, randomized clinical trial of efficacy. Menopause, 2012.
2. Magee PJ, Rowland I. Soy products in the management of breast cancer. Curr Opin Clin Nutr Metab Care 15:586-91, 2012.