“Flaxseeds are rich in short-chain vegetal omega-3s and also in lignans. These phytoestrogens allay the harmful effects of hormones that promote cancer growth. They have also been linked to lower cholesterol and attenuation of spikes in blood sugar levels.” [page 142, Servan-Schreiber, MD, PhD, David, Anticancer, A New Way of Life, 2009 edition]
“In a recent study at Duke University, daily intake of 30 grams of ground flaxseeds slowed the growth of existing prostate tumors by 30 percent to 40 percent. In France, researchers working with Professor Philippe Bougnoux, an oncologist specializing in omega-3 research, reported that women with breast cancer whose tissue samples were richer in omega-3 fatty acids derived from plants (such as flaxseeds, nuts, and canola oil) had a significantly lower risk of developing metastatic tumors.”, [page 142, Servan-Schreiber, MD, PhD, David, Anticancer, A New Way of Life, 2009 edition]
For more information…
About flaxseeds, see this article from the Mayo Clinic.
About omega 3s, see this article from US News and World Report.