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Specialty Supplements and Breast Cancer Risk in the VITamins And Lifestyle (VITAL) Cohort – Source: Cancer Epidemiology, Biomarkers & Prevention, July 2010

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By Theodore M Brasky, et al. • www.ProHealth.com • July 9, 2010


Background: Use of nonvitamin, nonmineral “specialty” supplements has increased substantially over recent decades. Several supplements may have anti-inflammatory or anticancer properties. Additionally, supplements taken for symptoms of menopause have been associated with reduced risk of breast cancer in two case-control studies. However, there have been no prospective studies [as opposed to studies after the fact] of the association between the long-term use of these supplements and breast cancer risk.

Methods: Participants were female members of the VITamins And Lifestyle (VITAL) Cohort. Postmenopausal women, ages 50 to 76 years, who were residents of western Washington State, completed a 24-page baseline questionnaire in 2000 to 2002 (n = 35,016).

Participants were queried on their recency (current versus past), frequency (days/week), and duration (years) of specialty supplement use.

Incident invasive breast cancers (n = 880) from 2000 to 2007 were obtained from the Surveillance, Epidemiology, and End Results registry. Multivariable-adjusted hazards ratios (HR) and 95% confidence intervals (95% CI) were estimated by Cox proportional hazards models.

Results:

• Current use of fish oil  was associated with reduced risk of breast cancer (HR, 0.68; 95% CI, 0.50-0.92). [Note: An HR of 1.0 represents no difference in average risk. This finding indicates that those who took fish oil were 32% less likely than others to be diagnosed with invasive breast cancer during the 8-year tracking period.]

• Ten-year average use was suggestive of reduced risk (P trend = 0.09). These results held for ductal but not lobular cancers.

• The remaining specialty supplements were not associated with breast cancer risk: Specifically, use of supplements sometimes taken for menopausal symptoms (black cohosh, dong quai, soy, or St. John's wort) was not associated with risk.

Conclusions: Fish oil may be inversely associated with breast cancer risk.

Impact: Fish oil is a potential candidate for chemoprevention studies. Until that time, it is not recommended for individual use for breast cancer prevention.

Source: Cancer Epidemiology, Biomarkers & Prevention, July 2010; 19(7); 1696–708. doi: 10.1158/1055-9965.EPI-10-0318, by Brasky TM, Lampe JW, Potter JD, Patterson RE, White E. Fred Hutchinson Cancer Research Center, University of Washington, Seattle; Department of Family and Preventive Medicine, University of California, San Diego, USA. [Email:
tbrasky@fhcrc.org]





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