Research in Canadian Medical Association Journal demonstrates that soy isoflavones reduce the reappearance of hormone-sensitive cancer for post-menopausal breast cancer victims.

A study of the Cancer Hospital of Harbin Medical University in China aimed to find evidence if the consumption of soy based products affects the growth of cancer tumors. Regarded chemically, soy isoflavones have a similar structure than the hormone estrogen which is proven to affect tumor growth.

524 female research participants, before and after their menopause, who all had to undergo surgery for breast cancer, were accompanied for five to six years in order to study the impact of soy isoflavone on their recovering process.

The average Asian female consumes circa 20-50mg of soy inflavones per day that she gets for example out of soy milk or soybeans.

A researcher describes the results: "The recurrence rate of estrogen- and progesterone- positive breast cancer was 12.9 pc lower among patients in the highest quartile of soy isoflavone intake than among those in the lowest quartile and was 18.7 pc lower for patients receiving anastrozole therapy in the highest quartile."