Flaxseed
In mice but an interesting trial on flaxseed.
Abstract
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In conclusion, FS [Flaxseed] inhibited MCF-7 tumor growth in a dose-dependent manner and enhanced the inhibitory effect of TAM due to the modulation of ER and growth factor signal transduction pathways."
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
Flaxseed alone or in combination with tamoxifen inhibits MCF-7 breast tumor growth in ovariectomized athymic mice with high circulating levels of estrogen.
Chen J, Power KA, Mann J, Cheng A, Thompson LU.
Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, 150 College Street, Toronto, ON, Canada M5S 3E2.