Dietary patterns and risk of recurrence and progression in non-muscle-invasive bladder cancer

The association of dietary factors with urinary bladder cancer prognosis has scarcely been investigated, and results of studies conducted to date are inconsistent. We investigated whether empirically derived dietary patterns are associated with risks of recurrence and progression in non-muscle invasive bladder cancer patients. Data from 595 newly diagnosed non-muscle-invasive bladder cancer patients from an ongoing prospective cohort study were used to derive dietary patterns using exploratory factor analysis. Factor scores were calculated and then categorized in sex-specific tertiles. Multivariable adjusted proportional hazards regression models were used to estimate hazard ratios and 95% confidence intervals for the associations between tertiles of adherence to the dietary patterns and risks of recurrence and progression. We identified four dietary patterns: "fruits and vegetables", "Western", "low-fat", and "Tex-Mex". Patients in the highest tertile of adherence to the Western pattern experienced a 1.48 times higher risk of recurrence (95% CI 1.06-2.06) compared to patients in the lowest tertile. No statistically significant associations of a Western diet with risk of progression, or of the other dietary patterns with risk of recurrence and progression were found. Overall, we found that adherence to a Western diet was associated with a higher risk of recurrence but further studies are needed to confirm our findings. This article is protected by copyright. All rights reserved.

International journal of cancer. 2017 Dec 13 [Epub ahead of print]

Ellen Westhoff, Xifeng Wu, Lambertus A Kiemeney, Seth P Lerner, Yuanqing Ye, Maosheng Huang, Colin P Dinney, Alina Vrieling, Huakang Tu

Radboud university medical center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands., The University of Texas M.D. Anderson Cancer Center, Department of Epidemiology, Houston, Texas., Scott Department of Urology, Baylor College of Medicine, Houston, TX, USA., The University of Texas M.D. Anderson Cancer Center, Department of Urology, Houston, Texas.