Abstract
Objective
To determine whether consumption of whole-grain rye bread, oatmeal, and whole-wheat bread, during different periods of life, is associated with risk of prostate cancer (PCa).
Methods
From 2002 to 2006, 2,268 men, aged 67–96 years, reported their dietary habits in the AGES-Reykjavik cohort study. Dietary habits were assessed for early life, midlife, and current life using a validated food frequency questionnaire. Through linkage to cancer and mortality registers, we retrieved information on PCa diagnosis and mortality through 2009. We used regression models to estimate odds ratios (ORs) and hazard ratios (HRs) for PCa according to whole-grain consumption, adjusted for possible confounding factors including fish, fish liver oil, meat, and milk intake.
Results
Of the 2,268 men, 347 had or were diagnosed with PCa during follow-up, 63 with advanced disease (stage 3+ or died of PCa). Daily rye bread consumption in adolescence (vs. less than daily) was associated with a decreased risk of PCa diagnosis (OR = 0.76, 95 % confidence interval (CI): 0.59–0.98) and of advanced PCa (OR = 0.47, 95 % CI: 0.27–0.84). High intake of oatmeal in adolescence (≥5 vs. ≤4 times/week) was not significantly associated with risk of PCa diagnosis (OR = 0.99, 95 % CI: 0.77–1.27) nor advanced PCa (OR = 0.67, 95 % CI: 0.37–1.20). Midlife and late life consumption of rye bread, oatmeal, or whole-wheat bread was not associated with PCa risk.
Conclusion
Our results suggest that rye bread consumption in adolescence may be associated with reduced risk of PCa, particularly advanced disease.
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Acknowledgments
We wish to thank Oddur Benediktsson (1937–2010) and the organization Framför for their support and interest in the study. JET is supported by Framför (Progress), an Icelandic organization that aims to fund research and education initiatives related to prostate cancer, the Icelandic Cancer Society and NordForsk, Nordic Centre of Excellence programme: HELGA: Nordic Health Whole Grain Food. JLK is supported by HELGA, in part by training grant NIH 5 T32 CA09001-36 and by the American Institute for Cancer Research. This study was also funded in part by the National Institute on Aging contract N01-AG-1-2100, in part by the Intramural Research Program of the National Institute on Aging, the Icelandic Heart Association, and the Althingi (the Icelandic Parliament).
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Torfadottir, J.E., Valdimarsdottir, U.A., Mucci, L. et al. Rye bread consumption in early life and reduced risk of advanced prostate cancer. Cancer Causes Control 23, 941–950 (2012). https://doi.org/10.1007/s10552-012-9965-2
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DOI: https://doi.org/10.1007/s10552-012-9965-2