[Effects of phytoestrogens on prognosis and hormonal markers of breast cancer: A systematic review of randomized controlled trials].
INTRODUCTION Estrogen exposure is a known risk factor for breast cancer. Phytoestrogens, plant-derived compounds found in the diet, have a structure similar to estradiol. Observational studies suggest that they are associated with a reduced risk of breast cancer recurrence. The objective of this systematic review is to...