MDR1 gene C3435T polymorphism and cancer risk: a meta-analysis of 34 case-control studies.

Journal of Cancer Research and Clinical Oncology
Jun WangJianshi Di

Abstract

P-glycoprotein, the product of the MDR1 gene, is a transmembrane active efflux pump for a variety of environmental toxins and xenobiotics. Epidemiological studies have evaluated the association between MDR1 C3435T polymorphism and cancer susceptibility. However, published data are still inconclusive. To derive a more precise assessment of this relevance, we performed a meta-analysis, up to September 2010, of 5,196 cases with different cancer types and 6,827 controls from 34 published case-control studies. Summary odds ratios (ORs) and corresponding 95% confidence intervals (CIs) for MDR1 C3435T polymorphism and cancer were estimated using fixed- and random-effects models when appropriate. The overall results suggested that the variant was associated with a moderately increased cancer risk in all comparison models tested (OR = 1.26, 95% CI: 1.06-1.50 for TT vs. CC; OR = 1.19, 95% CI: 1.04-1.37 for CT vs. CC; OR = 1.15, 95% CI: 1.01-1.32 for recessive model; OR = 1.21, 95% CI: 1.06-1.38 for domain model, and OR = 1.14, 95% CI: 1.04-1.26 for allele contrast). In the subgroup analysis by cancer types, significant associations were found in breast cancer (OR = 1.66, 95% CI: 1.24-2.21 for TT vs. CC; OR = 1.44, 95% CI: 1.14-1.82 for r...Continue Reading

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