In a discovery that display more quickly because they relate to public health, the two results of experiments conducted randomized controlled trial showed that the supplements failed to prevent cancer, although previous findings showed promising results, especially selenium.
Both studies were planned to be published in the Journal of the American Medical Association.
"Our research shows that there is no evidence of benefit from selenium and vitamin E in preventing prostate cancer and other cancers," said study author, Dr. Scott Lippman, a professor of medicine in the division of cancer medicine at MD Anderson cancer center, in Houston (the division of cancer medicine at MD Anderson Cancer Center)
Lippman's study, known as the SELECT trial, included more than 35,000 men. Black males are involved more than 50 years old and men of other races over the age of 55 years.
According to the (American Cancer Society), black males more at risk of developing prostate cancer compared with men of other races.
The men were randomly divided into several groups: taking selenium; vitamin E; selenium and vitamin E; vitamin C or placebo. The average time for this experiment is 8 years old.
From the results of this experiment, no significant benefit from vitamin C or vitamin E in preventing prostate cancer and other cancers.
Two of these studies is the recent study of a number of studies have been conducted in examining the benefits of vitamins and supplements to prevent cancer. Several previous studies have shown that vitamin B, C, D, E, folic acid and calcium are consumed separately, or in various combinations, are not effective in preventing cancer.
Andrew Shao, vice president of scientific and regulatory part of the Center for Responsible Nutrition in Washington, DC, said, researchers need to redefine our expectations for nutrients. Nutrients are not a magic bullet, although these nutrients are showing real results.
Shao said studies that studied the relationship of vitamins and cancer prevention tend to treat vitamins the same way as pharmaceutical drugs.
"The whole body is affected by nutrition, drugs while pharmaceutical products designed specifically for a particular cell," said Shao. "It is a mistake to look at one trial that answers a specific question and say that these nutrients are not useful at all," said Shao.
However, Lippman said that he did not recommend the use of supplements to prevent cancer. "There is no evidence to support its benefits," says Lippman.
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