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New Evidence Shows Fish Oil Reduces Incidence of Invasive Ductal Breast Cancer

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Researchers at the Fred Hutchinson Cancer Research Center in Seattle, WA, have found that omega fatty acids found in fish oil show promising results in reducing the incidence of invasive ductal breast (IDC) cancer, sometimes called infiltrating ductal carcinoma.

Emily White, Ph.D., a member of the public health sciences division, asked 35,016 postmenopausal women who did not have a history of breast cancer to complete a 24-page questionnaire about their use of non-vitamin, non-mineral "specialty" supplements in the Vitamins and Lifestyle (VITAL) cohort study.

After six years of follow-up, 880 cases of breast cancer were identified. Regular use of fish oil supplements, which contain high levels of the omega-3 fatty acids EPA and DHA, was linked with a 32 percent reduced risk of IDC, the most common type of the disease. About 80 percent of all breast cancers diagnosed are invasive ductal carcinomas.

Fish oil did not appear to have any effect on other types of breast cancer. Likewise, the use of other specialty supplements, many of which are commonly taken by women to treat symptoms of menopause, was not associated with breast cancer risk.

White’s research, published in Cancer Epidemiology, Biomarkers & Prevention a journal of the American Association for Cancer Research, is the first to demonstrate a link between the use of fish oil supplements and a reduction in breast cancer. Studies of dietary intake of fish or omega-3 fatty acids have not been consistent.

“It may be that the amount of omega-3 fatty acids in fish oil supplements are higher than most people would typically get from their diet,” White said in a written statement. However, she cautions it is too early to know if there is a causal relationship between the supplement and IDC.

Dr. Edward Giovannucci, a professor of nutrition and epidemiology at the Harvard School of Public Health agreed.

“It is very rare that a single study should be used to make a broad recommendation," said Giovannucci. "Over a period of time, as the studies confirm each other, we can start to make recommendations.”

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