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Investigating the possible causal role of coffee consumption with prostate cancer risk and progression using Mendelian randomization analysis

Taylor, AE, Martin, RM, Geybels, MS, Stanford, JL, Shui, I, Eeles, R, Easton, D, Kote-Jarai, Z, Amin Al Olama, A, Benlloch, S, Muir, K, Giles, GG, Wiklund, F, Gronberg, H, Haiman, CA, Schleutker, J, Nordestgaard, BG, Travis, RC, Neal, D, Pashayan, N, Khaw, KT, Blot, W, Thibodeau, S, Maier, C, Kibel, AS, Cybulski, C, Cannon-Albright, L, Brenner, H, Park, J, Kaneva, R, Batra, J, Teixeira, MR, Pandha, H, Donovan, J, Munafo, MR and Fitzgerald, LM ORCID: 0000-0002-6882-2698 2017 , 'Investigating the possible causal role of coffee consumption with prostate cancer risk and progression using Mendelian randomization analysis' , International Journal of Cancer, vol. 140, no. 2 , pp. 322-328 , doi: 10.1002/ijc.30462.

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Abstract

Coffee consumption has been shown in some studies to be associated with lower risk of prostate cancer. However, it is unclear if this association is causal or due to confounding or reverse causality. We conducted a Mendelian randomisation analysis to investigate the causal effects of coffee consumption on prostate cancer risk and progression. We used two genetic variants robustly associated with caffeine intake (rs4410790 and rs2472297) as proxies for coffee consumption in a sample of 46,687 men of European ancestry from 25 studies in the PRACTICAL consortium. Associations between genetic variants and prostate cancer case status, stage and grade were assessed by logistic regression and with all-cause and prostate cancer-specific mortality using Cox proportional hazards regression. There was no clear evidence that a genetic risk score combining rs4410790 and rs2472297 was associated with prostate cancer risk (OR per additional coffee increasing allele: 1.01, 95% CI: 0.98,1.03) or having high-grade compared to low-grade disease (OR: 1.01, 95% CI: 0.97,1.04). There was some evidence that the genetic risk score was associated with higher odds of having nonlocalised compared to localised stage disease (OR: 1.03, 95% CI: 1.01, 1.06). Amongst men with prostate cancer, there was no clear association between the genetic risk score and all-cause mortality (HR: 1.00, 95% CI: 0.97,1.04) or prostate cancer-specific mortality (HR: 1.03, 95% CI: 0.98,1.08). These results, which should have less bias from confounding than observational estimates, are not consistent with a substantial effect of coffee consumption on reducing prostate cancer incidence or progression.

Item Type: Article
Authors/Creators:Taylor, AE and Martin, RM and Geybels, MS and Stanford, JL and Shui, I and Eeles, R and Easton, D and Kote-Jarai, Z and Amin Al Olama, A and Benlloch, S and Muir, K and Giles, GG and Wiklund, F and Gronberg, H and Haiman, CA and Schleutker, J and Nordestgaard, BG and Travis, RC and Neal, D and Pashayan, N and Khaw, KT and Blot, W and Thibodeau, S and Maier, C and Kibel, AS and Cybulski, C and Cannon-Albright, L and Brenner, H and Park, J and Kaneva, R and Batra, J and Teixeira, MR and Pandha, H and Donovan, J and Munafo, MR and Fitzgerald, LM
Keywords: Mendelian randomization, coffee, prostate cancer
Journal or Publication Title: International Journal of Cancer
Publisher: Wiley-Liss
ISSN: 0020-7136
DOI / ID Number: 10.1002/ijc.30462
Copyright Information:

VC 2016 The Authors

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