A Tverdal, 2014, Boiled coffee consumption and the risk of prostate cancer: follow-up of 224,234 Norwegian men 20 – 69 years. British Journal of Cancer, published online ahead of print.

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ABSTRACT:

Background: There is insufficient epidemiological evidence on the relationship between type of coffee and the risk of prostate cancer.
Methods:The risk of prostate cancer by use of boiled vs not boiled coffee were assessed in a prospective study of 224,234 men 20-69 years. 5740 incident prostate cancers were identified.
Results:With no coffee as reference group the hazard ratios of <1-4, 5-8 and 9+ cups per day of boiled coffee only were 0.84 (0.73-0.96), 0.80 (0.70-0.92) and 0.66 (0.55-0.80), P-trend=0.00. The corresponding figures for not boiled coffee were 0.89 (0.80-0.99), 0.91 (0.81-1.02) and 0.86 (0.74-1.00), P-trend=0.22.
Conclusion:An inverse relationship between number of cups per day and the risk of prostate cancer was present only for the boiled coffee type.

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