Prostate Cancer Not Prevented By Supplements
When it comes to natural ways to prevent prostate cancer, vitamin E, selenium, and soy supplements were believed to have a unique effect on blocking the development of this disease. However, according to a new study published in the Journal of Clinical Oncology these supplements may not live up to what they claim.
Vitamin E, Selenium, and Soy Don't Prevent Prostate Cancer
The purpose of this study, conducted by Canadian researchers, was to to further investigate previous preclinical research conducted on mice which indicated that these three supplements may block the development of precancerous prostate cells into cancerous cells. In addition, data from Asian counties such as China and Japan where soy consumption is highest, have also reported the lowest population rates of prostate cancer, leading researchers to believe that this dietary component may be a powerful protector against prostate cancer in men.
For the study, researchers had more than 300 men at high risk for the development of prostate cancer take a combination of vitamin E, selenium and soy supplements for three years. At the end of the three years the researchers found that in both groups the rate of development of prostate cancer was nearly identical - approximately 26 out of every 100 men. Therefore, study authors concluded, these supplements had no significant outcome on the development of prostate cancer.
Despite the disappointment, these findings are in line with a previous study conducted in 2008 which also found vitamin E and selenium to have no effect on prostate caner outcome.
“I think that in the absence of more compelling scientific data for vitamin E and selenium, that we should move on," Dr. Eric Klein, chair of the Glickman Urological and Kidney Institute at the Cleveland Clinic, told Reuters Health.
Nearly 1 in 6 men will be diagnosed with prostate cancer in their lifetimes and there are now approximately 2 million men living in the US who have already been diagnosed. Experts are still unclear about why this cancer develops in men and exactly what men can do to prevent it.
The present study was funded by the Canadian Cancer Society Research Institute.
Resource: "Progression From High-Grade Prostatic Intraepithelial Neoplasia to Cancer: A Randomized Trial of Combination Vitamin-E, Soy, and Selenium" Published online ahead of print in the Journal of Clinical Oncology, May 2, 2011