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Fatty fish consumption associated with lower risk of kidney cancer in women

Preliminary research suggests that higher consumption of fatty fish in women is linked with a lower risk of renal cell carcinoma, a common form of kidney cancer, according to a study in the September 20 issue of JAMA.

Renal cell carcinoma (RCC) involving the renal parenchyma (the functional tissue of the kidney) accounts for more than 80 percent of all kidney cancers. Renal cell carcinoma incidence rates in the United States had been increasing in 1970-1990s, especially among black women and men; more recent data suggest a leveling off in this trend for most racial groups. The evidence that fish consumption, especially fatty fish, may be associated with lower risk of several cancers has not been consistent, according to background information in the article.

Previous studies have analyzed total fish consumption and have not taken into account that there are large differences between fatty fish and lean fish in the content of omega-3 fatty acids and vitamin D. Marine omega-3 polyunsaturated fatty acids, eicosapentaenoic acid and docosahexaneoic acid, which are present in significant amounts in fatty cold-water fish (up to 20-30 times higher content than in lean fish), have been reported to slow the development of cancer. Fatty fish has 3 to 5 times higher content of vitamin D than lean fish, and lower serum vitamin D levels have been associated with development and progression of RCC.

Alicja Wolk, D.M.Sc., of the Karolinska Institutet, Stockholm, Sweden and colleagues investigated the association between fatty fish and lean fish consumption and the risk for development of RCC in a population with a relatively high consumption of fatty fish. The participants, from the Swedish Mammography Cohort, included 61,433 women age 40 to 76 years without previous diagnosis of cancer at baseline (March 1987 to December 1990). Participants filled in a food frequency questionnaire at baseline and in September 1997. The researchers considered fatty
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Contact: Alicja Wolk, D.M.Sc.
alicja.wolk@ki.se
JAMA and Archives Journals
19-Sep-2006


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