Soy milk and PSA levels in men with progresive prostate cancer

A recent study at B.C. Cancer Agency, Canada, aimed to evaluate the tolerability and effect of a daily soy beverage in prostate cancer patients with biochemical failure after radiotherapy.

Investigators instructed patients with rising prostate-specific antigen (PSA) after radical radiation for prostate cancer to consume 500 ml of soy beverage daily for 6 months.

The authors found that, over a period of 6 months, daily consumption of a soy beverage was well tolerated and was associated with a declining trend in PSA level. Over 40 percent of men did appear to benefit from the soy diet, with PSA levels either falling buy a small amount or at least rising less slowly over time.