Dietary intake of meat, fruits, vegetables, and selective micronutrients and risk of bladder cancer in the New England region of the United States
Menée dans trois états américains (Maine, New Hampshire et Vermont) à partir de données de registres médicaux portant sur la période 2001 - 2004 et à l'aide d'un questionnaire, cette étude évalue l'association entre la consommation de viande, de fruits, de légumes ou de micronutriments et le risque de cancer de la vessie (1 171 cas, 1 418 témoins)
Background : Despite many studies on diet and bladder cancer, there are areas that remain unexplored including meat mutagens, specific vegetable groups, and vitamins from diet. Methods : We conducted a population-based case–control study of bladder cancer in Maine, New Hampshire, and Vermont. A total of 1171 cases were ascertained through hospital pathology records and cancer registries from 2001 to 2004. Overall, 1418 controls were identified from the Department of Motor Vehicles (<65 years) and Center for Medicaid and Medicare Services (65–79 years) and were frequency-matched to cases by state, sex, and age (within 5 years). Diet was assessed with a self-administered Diet History Questionnaire. Unconditional logistic regression was used to estimate odds ratios (OR) and 95% confidence intervals (CI). Results : Processed meat intake was positively associated with bladder cancer (highest vs lowest quartile OR: 1.28; 95% CI: 1.00–1.65; Ptrend=0.035), with a stronger association for processed red meat (OR: 1.41; 95% CI: 1.08–1.84; Ptrend=0.024). There were no associations between intake of fruits or vegetables and bladder cancer. We did, however, observe an inverse association with vitamin B12 intake (OR: 0.77; 95% CI: 0.61–0.99; P=0.019). Conclusion : Vitamin B12 from diet may be protective against bladder cancer, whereas consuming processed meat may increase risk.