However, recent breast cancer research over the last couple of years suggests that soy foods and soy isoflavones have breast cancer fighting benefits including possibly reducing breast cancer risk and reducing the risk of breast cancer recurrence. Two of the largest and most recent population-based studies, the Shanghai Breast Cancer Survival Study (free to download) and the Life After Cancer Epidemiology study, reported that higher levels of soy food and soy isoflavone consumption in breast cancer survivors was linked to reduced risk of breast cancer recurrence and reduced risk of death. Nonetheless, additional studies in different populations are needed to further clarify the potential benefits of soy consumption for breast cancer survivors.
A new breast cancer study published online in Cancer Epidemiology, Biomarkers & Prevention explored the relationship between soy food and soy isoflavone consumption on mortality in breast cancer patients who had been diagnosed with breast cancer within the previous 2 years on average. For this study, soy food and soy isoflavone consumption were determined in nearly 3,100 breast cancer survivors using a food-frequency questionnaire and a separate questionnaire to assess soy supplement intake. Breast cancer survivors reported new breast cancer events every 6 months, which were then confirmed with medical records. Analysis of the link between breast cancer recurrence, mortality and soy consumption during 7 years of follow up showed that:
- The risk of death was significantly decreased as soy isoflavone intake increased.
- Breast cancer survivors consuming more than 16.3 mg of soy isoflavones per day had a 54% reduced risk of dying.
- Soy food and soy isoflavone intake was not linked to breast cancer recurrence regardless of whether the breast cancer survivors were taking tamoxifen or not.
- When examined by hormone receptor status of the breast cancer tumor, soy consumption did not increase mortality or breast cancer recurrence in hormone receptor-positive or hormone receptor-negative breast cancer survivors.
To learn about other diet and lifestyle choices to reduce your breast cancer risk, read my FREE book FIGHT NOW: EAT & LIVE PROACTIVELY AGAINST BREAST CANCER. Please recommend to anyone interested in breast cancer, breast cancer treatment, and breast cancer symptoms.