This has led to the suggestion that the increase in breast cancer incidence may be a soy deficiency. Breast and prostate cancers are running at epidemic levels in the United States. Every year, more Americans are being diagnosed with these cancers. Genistein and other soy components provide specific anti-cancer protection that is not obtained through antioxidant supplements. Soy has been shown to block the estrogen-testosterone cell mutating actions of pesticides, herbicides, fungicides, and other pollutants.
Tyrosine kinase is an enzyme that is required for most tumor cell proliferation.
Soy has been shown to safely inhibit tyrosine kinase activity, thus slowing down cancer cell growth. Tumors grow new blood vessels to support the rapidly growing number of cancer cells. Soy has been shown to have an angiogenesis inhibiting effect that prevents new blood vessel growth into tumors. The hormones estrogen and testosterone promote cell growth Throughout the body. Soy modulates the effects of estrogen and testosterone in a favorable way, thus reducing their risk of inducing cancer.