NEW YORK a new study dégonfle hope that some nutritional supplements may delay cancer of the prostate cancer the second more common among men.
Canadian researchers have discovered that the vitamin E, selenium and soya, taken daily for three years, not provided no benefit to men who have a higher risk of developing the disease.
The results come from three years after a study more than men who were at no increase in the risk of prostate cancer, also found no benefit of supplementation with selenium or vitamin E (see the report on the health of Reuters)(, October 28, 2008).
Initially, there were high hopes for these supplements, said Dr. Neil Fleshner, who worked on the new research and heads Urology at the University Health Network in Toronto.
Surveys of people who consumed high levels of vitamin E, selenium or soybean through diet or supplements that a decrease in the risk of developing cancer of the prostate and experiments in laboratory animals have also shown a profit.
Vitamin e and selenium are two antioxidants present in food.
In this study, researchers randomly 303 men take a combination of supplements or a non-nutritive powder resembling supplements every day for three years.
The combination included soybean 40 g (approximately 1/3 of a cup), 800 U 0.2 g of selenium (four times the dietetics recommended amount) and vitamin E (approximately 35 times the diet recommended levels).
All men had signs of pre-cancerous cells, which are exposed to a risk of developing prostate cancer.
Fleshner and his colleagues by the number of cases of cancer in each group, the results are almost identical. Twenty-six of 100 men developed prostate cancer after three years, regardless of whether if they took the supplement or powder based on whey placebo.
"To our sorrow, no there was no benefit," Fleshner told Reuters Health.
Current research differ from previous work in that it included the soybeans. Said FLESHNER of prostate cancer rates are much lower in China and the Japan, where consumers consume soy in large quantities, to the United States or the Canada.
The results exclude soybeans may be useful to those who eat frequently during decades, but do not appear three years additional soy to help prevent prostate cancer.
The Canadian Institute for research on Cancer funded the study, and supplements the company was provided by a company which manufactures the.
"I think that, in the absence of more convincing, scientific data for the vitamin e and selenium, that we should spend," Dr. Eric Klein, President of the Institute of the Cleveland Clinic kidney and urological Glickman who led the study of 2008told Reuters Health.
Prostate cancer is diagnosed in 156 of every 10,000 men to the United States each year. But some tumors may never become deadly and there is debate on how best to treat them.
FLESHNER agreed with Klein, who was not involved in the new study, that there are sufficient data now to justify the abandonment of the research on vitamin E, selenium and soya and their potential benefits for the prevention of prostate cancer.
"We must look at new strategies and new nutritional agents," said Fleshner.
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