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Selected antioxidants and risk of hormone receptor–defined invasive breast cancers among postmenopausal women in the Women's Health Initiative Observational Study^1,2,3

¹ From the Office of Health Assessment and Epidemiology, Los Angeles County Department of Public Health, Los Angeles, CA (YC); the Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, AL (JMS); the Department of Epidemiology, University of California at Los Angeles, Los Angeles, CA (SL); the Department of Obstetrics/Gynecology and Internal Medicine, University of California at Davis, Sacramento, CA (YS); the Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY (TER)

Background: Few studies have evaluated carotenoids and vitamins C and E in association with the risk of breast cancers defined by estrogen receptor (ER) and progesterone receptor (PR) status.

Objective: We examined the associations between dietary and supplemental intakes of these nutrients and risk of breast cancers jointly defined by both ER and PR status among postmenopausal women.

Design: Our investigation was conducted in the Women's Health Initiative Observational Study. After following 84 805 women for an average of 7.6 y, 2879 incident invasive breast cancer cases had been ascertained, of whom 2509 had receptor data. We used Cox proportional hazards models to assess the associations of interest.

Results: Dietary -carotene (highest versus lowest quintile: RR = 0.83; 95% CL = 0.70, 0.99; P for trend = 0.019), β-carotene (highest versus lowest quintile: RR = 0.78; 95% CL = 0.66, 0.94; P for trend = 0.021), and lycopene (highest versus lowest quintile: RR = 0.85; 95% CL = 0.73, 1.00; P for trend = 0.064) were inversely associated with risk of ER+PR+breast cancer, but not with other breast cancer groups jointly defined by ER and PR status. Total or supplemental β-carotene and dietary intakes of lutein+zeaxanthin and β-cryptoxanthin were not associated with breast cancers defined by ER and PR status. Vitamin E (regardless of source) and dietary vitamin C were not associated with breast cancer. However, total and supplemental vitamin C intake had weak positive associations with breast cancer overall.

Conclusion: Dietary intake of certain carotenoids might be differentially associated with risk of invasive breast cancers jointly defined by ER and PR status among postmenopausal women.