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abstract:
Systematic review/Meta-analysis

Association between circulating leptin concentration and G-2548A gene polymorphism in patients with breast cancer: a meta-analysis

Ji-Qing Hao, Qian-Kun Zhang, Yi-Xin Zhou, Li-Hao Chen, Peng-Fei Wu

Arch Med Sci
Online publish date: 2018/05/15
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Introduction
The aim of this meta-analysis was to summarize the evidence on the serum/plasma leptin concentrations in breast cancer (BC) patients, as well as the associations between leptin G-2548A gene polymorphisms and susceptibility to BC.

Material and methods
Potentially relevant studies about serum/plasma leptin levels and leptin G-2548A gene polymorphism were selected using the electronic databases PubMed, EMBASE and The Cochrane Library (from January 1 1995 to Jun 30 2017, no language restrictions). The potential sources of heterogeneity were assessed by the Q statistic and quantified using I2; publication bias was qualitatively assessed by funnel plot and quantitatively assessed by Egger’s linear regression test.

Results
A total of 1141 articles were retrieved after database searches, and 27 studies with 9516 subjects (4542 BC patients/4974 controls) were finally included. The results indicated that BC patients had significantly higher leptin levels compared with healthy controls (SMD = 1.65, 95% CI: 1.21–2.09, p < 0.001), but there was no association between leptin G-2548A polymorphism and BC (OR = 1.05, 95% CI: 0.80–1.39, p = 0.722). Subgroup analyses demonstrated increased leptin levels in BC patients of different region, race, body mass index and waist circumference.

Conclusions
Our results revealed a significantly higher leptin level in BC patients than in healthy controls, but no association between leptin G-2548A polymorphism and BC susceptibility was found.

keywords:

breast cancer, leptin, gene polymorphism, meta-analysis

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