Journal
INTERNATIONAL JOURNAL OF FOOD SCIENCES AND NUTRITION
Volume 65, Issue 3, Pages 286-292Publisher
TAYLOR & FRANCIS LTD
DOI: 10.3109/09637486.2013.866641
Keywords
Folate; meta-analysis; prostate cancer
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Epidemiological studies have reported conflicting results between folate intake and bladder cancer risk. We conducted a meta-analysis of epidemiological studies published between 1996 and June 2013 on the relationship between folate intake and bladder cancer. We quantified associations with bladder cancer using meta-analysis of risk estimates (REs) associated to the highest versus the lowest category of folate intake using random effect models. Seven cohort and six case-control studies were eligible for inclusion. A significantly decreased risk with bladder cancer was observed in overall folate intake group (RE = 0.84; 95% CI, 0.72-0.96) and subgroup of case-control studies (RE = 0.73; 95% CI, 0.57-0.89), but not in cohort studies (RE = 0.96; 95% CI, 0.81-1.10) when comparing the highest with the lowest category of folate intake. No heterogeneity and publication bias were observed across studies. Although the current evidence, mainly based on data from case-control studies, supports an inverse association between folate intake and bladder cancer, additional large and well-designed cohort studies are needed before definitive conclusions can be drawn.
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