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JOURNAL ARTICLE
META-ANALYSIS
Total fat consumption and pancreatic cancer risk: a meta-analysis of epidemiologic studies.
European Journal of Cancer Prevention 2015 July
Fat consumption has been hypothesized to influence pancreatic cancer risk, but the results of epidemiologic studies have been controversial. We conducted a systematic review and meta-analysis of case-control and cohort studies to investigate this issue. Relevant published studies were identified by searching MEDLINE (PubMed) through February 2014. Two authors (Q.-W.S. and Q.-Y.Y.) independently assessed eligibility and the extracted data. Study-specific relative risks (RRs) were pooled using a random-effects model. We also carried out heterogeneity and publication bias analyses. Six cohort and 13 case-control studies with 6159 pancreatic cancer cases and 1,068,476 noncases were included in this meta-analysis. The summary RR for pancreatic cancer for the highest versus lowest intake was 1.04 [95% confidence interval (CI)=0.90-1.20, I²=57.3%, P for heterogeneity=0.001] for total fat. In addition, when separately analyzed by study design, case-control (RR=1.03, 95% CI=0.83-1.27, I²=55.8%, P for heterogeneity=0.007) and cohort studies (RR=1.05, 95% CI=0.85-1.29, I²=66.7%, P for heterogeneity=0.010) yielded similar results. Furthermore, no statistically significant associations were observed in the subgroup analyses on the basis of fat source, geographic location, whether using energy-adjusted models, and whether adjusted for several potential confounders and important risk factors. There was no evidence of publication bias or significant heterogeneity between subgroups on meta-regression analyses. The results of this meta-analysis do not support an independent association between diets high in total fat and pancreatic cancer risk.
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