Post-diagnostic coffee and tea consumption and breast cancer survival |
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| Authors: | Maryam S Farvid Nicholas D Spence Bernard A Rosner Walter C Willett A Heather Eliassen Michelle D Holmes |
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| Institution: | 1.Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA USA ;2.Department of Sociology and Department of Health and Society, University of Toronto, Toronto, ON Canada ;3.Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA USA ;4.Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA USA |
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| Abstract: | Background We examined the role of post-diagnostic coffee and tea consumption in relation to breast cancer-specific and all-cause mortality among women with breast cancer in prospective cohort studies.Methods We identified 8900 women with stage I–III breast cancer from 1980 through 2010 in the Nurses’ Health Study (NHS) and from 1991 through 2011 in the NHSII. Post-diagnostic coffee and tea consumption was assessed by a validated food frequency questionnaire every 4 years after diagnosis.Results During up to 30 years of follow-up, we documented 1054 breast cancer-specific deaths and 2501 total deaths. Higher post-diagnostic coffee consumption was associated with a lower breast cancer-specific mortality: compared with non-drinkers, >3 cups/day of coffee was associated with a 25% lower risk (hazard ratio (HR) = 0.75, 95% confidence interval (CI) = 0.59–0.96; Ptrend = 0.002). We also observed a lower all-cause mortality with coffee consumption: compared with non-drinkers, >2 to 3 cups/day was associated with a 24% lower risk (HR = 0.76, 95% CI = 0.66–0.87) and >3 cups/day was associated with a 26% lower risk (HR = 0.74, 95% CI = 0.63–0.87, Ptrend < 0.0001). Post-diagnostic tea consumption was associated with a lower all-cause mortality: compared with non-drinkers, >3 cups/day was associated with a 26% lower risk (HR = 0.74, 95% CI = 0.58–0.95; Ptrend = 0.04).Conclusions Among breast cancer survivors, higher post-diagnostic coffee consumption was associated with better breast cancer and overall survival. Higher post-diagnostic tea consumption may be related to better overall survival.Subject terms: Breast cancer, Outcomes research |
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