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Synthesis of genetic association studies for pertinent gene-disease associations requires appropriate methodological and statistical approaches.

Abstract：

OBJECTIVE:The aim of the study was to consider statistical and methodological issues affecting the results of meta-analysis of genetic association studies for pertinent gene-disease associations. Although the basic statistical issues for performing meta-analysis are well described in the literature, there are remaining methodological issues. STUDY DESIGN AND SETTING:An analysis of our database and a literature review were performed to assess issues such as departure of Hardy-Weinberg equilibrium, genetic contrasts, sources of bias (replication validity, early extreme contradictory results, differential magnitude of effect in large versus small studies, and "racial" diversity), utility of cumulative and recursive cumulative meta-analyses. Gene-gene-environment interactions and methodological challenges of genome-wide association studies are discussed. RESULTS:Departures from Hardy-Weinberg equilibrium can be handled using sensitivity analysis or correction procedures. A spectrum of genetic models should be investigated in the absence of biological justification. Cumulative and recursive cumulative meta-analyses are useful to explore heterogeneity in risk effect in time. Exploration of bias leading to heterogeneity provides insight to postulated genetic effects. In the presence of bias, results should be interpreted with caution. CONCLUSIONS:Meta-analysis provides a robust tool to investigate contradictory results in genetic association studies by estimating population-wide effects of genetic risk factors in diseases and explaining sources of bias and heterogeneity.

journal_name

J Clin Epidemiol

journal_title

Journal of clinical epidemiology

authors

Zintzaras E,Lau J

doi

10.1016/j.jclinepi.2007.12.011

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

634-45

issue

7

eissn

0895-4356

issn

1878-5921

pii

S0895-4356(08)00008-5

journal_volume

61

pub_type

杂志文章,评审

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