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Journal Article
Meta-Analysis
Review
Meta-analysis of studies using metformin as a reducer for liver cancer risk in diabetic patients.
Medicine (Baltimore) 2017 May
Metformin has garnered more interest as a chemo-preventive agent given the increased liver cancer risk in diabetic patients. This work was undertaken to better understand the effect of metformin use on liver cancer risk in diabetic patients.A comprehensive literature search was performed in PubMed, Embase, BIOSIS Previews, Web of Science, and Cochrane Library through July 30, 2016. Meta-analyses were performed using Stata version 12.0, with odds ratio (ORs) and 95% confidence intervals (CIs) as effect measures.Twenty-three studies were included. Meta-analysis of 19 studies involving 550,882 diabetic subjects suggested that metformin use reduced the ratio of liver cancer by 48% (OR = 0.52; 95% CI, 0.40-0.68) compared with nonusers. The protective effect was validated in all the exploratory subgroup analyses, except that pooled result of post hoc analyses of 2 randomized controlled trials found no significant difference between subjects with metformin and those without, with OR being 0.84 (95% CI, 0.10-6.83). After adjusting for hepatitis B/C virus infection, cirrhosis, obesity, behavioral factors, and time-related bias, the association was stable, pooled OR ranged from 0.42 to 0.75.A protective effect for liver cancer was found in diabetic metformin users. However, more randomized clinical evidence is still needed to verify the results.
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