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Tomatoes are Not So Effective in Preventing Prostate Cancer

Researchers based at the National Cancer Institute and Fred Hutchinson Cancer Research Center report that lycopene, an antioxidant predominately found in tomatoes , does not effectively prevent prostate cancer.

In fact, the researchers noted an association between beta-carotene, an antioxidant related to lycopene, and an increased risk for aggressive prostate cancer.

It is disappointing, since lycopene might have offered a simple and inexpensive way to lower prostate cancer risk for men concerned about this common disease," said Ulrike Peters, Ph.D., M.P.H., of the Fred Hutchinson Cancer Research Center.

"Unfortunately, this easy answer just does not work." Peters added.

Previous studies suggested that a diet rich in lycopene protected against prostate cancer, spurring commercial and public interest in the antioxidant. Antioxidants protect against free radicals, highly reactive atoms and molecules that can damage DNA and other important molecules in the cell. Since free radical damage increases with age, there has been a long-held suspicion in the scientific community that free radical damage could increase the risk of prostate cancer, a disease that has been clearly associated with age.

In their current study, the researchers focused on non-Hispanic Caucasian men, as the small number of cases among other ethnic groups was statistically insignificant. They found no significant difference between those who had prostate cancer and those who did not in relation to the concentration of lycopene in their bloodstream.

"Our results do not offer support for the benefits of lycopene against prostate cancer," Peters said.

Most surprisingly, says Peters, was the relationship between increased risk of aggressive prostate cancer defined as disease that has spread beyond the prostate and beta-carotene, another antioxidant found in many vegetables and commonly used as a dietary s
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