title: Multidrug resistance gene 1 C1236T polymorphism and susceptibility to leukemia: A meta-analysis.
abstract: Several studies have investigated the association between multidrug resistance gene (MDR1) C1236T polymorphism and leukemia risk, however, these published studies have yielded conflicting results. Thus, the present study carried out a meta-analysis to provide a more precise estimate of the effect of this polymorphism on the susceptibility to leukemia. The published case-control studies regarding the association betweenMDR1C1236T polymorphism and leukemia risk were included following a computerized search of PubMed, Elsevier, The Cochrane Library, China National Knowledge Infrastructure and Wanfang Database. Either fixed- or random-effects models were applied to calculate the combined odds ratios (ORs) and 95% confidence intervals (CIs) by RevMan 5.2 software. Seven studies, including 846 cases and 1,523 controls, were included in the present meta-analysis. The results indicated that there was no significant association between theMDR1C1236T polymorphism and leukemia risk in overall comparisons in all four genetic models (CT vs. CC: OR, 1.31, 95% CI, 0.89-1.91, P=0.17; TT vs. CC: OR, 2.16, 95% CI, 0.99-4.70, P=0.05; TT vs. CC+CT: OR, 1.72, 95% CI, 0.91-3.25, P=0.09; and CT+TT vs. CC: OR, 1.57, 95% CI, 0.96-2.56, P=0.07). In the subgroup analysis according to specific ethnicity, age and the type of leukemia, a significant association was found in adult leukemia (CT+TT vs. CC: OR, 2.77, 95% CI, 1.05-7.31, P=0.04) and chronic myeloid leukemia (CT vs. CC: OR, 1.71, 95% CI, 1.05-2.80, P=0.03). No significant publication bias was detected by funnel plot. Therefore, the meta-analysis indicated that theMDR1C1236T polymorphism may contribute to the susceptibility to adult leukemia and chronic myeloid leukemia. Furthe well-designed studies based on larger sample sizes are required to validate these findings.
authors.affiliation: Department of Hematology, The First Affiliated Hospital, Luoyang, Henan 471003, P.R. China.
authors.forename: Limin
authors.initials: L
authors.lastname: Ma
authors.affiliation: Medical College, Henan University of Science and Technology, Luoyang, Henan 471003, P.R. China.
authors.forename: Hongchao
authors.initials: H
authors.lastname: Liu
authors.affiliation: Department of Hematology, The First Affiliated Hospital, Luoyang, Henan 471003, P.R. China.
authors.forename: Linhai
authors.initials: L
authors.lastname: Ruan
authors.affiliation: Department of Hematology, The First Affiliated Hospital, Luoyang, Henan 471003, P.R. China.
authors.forename: Xuewen
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Hematology, The First Affiliated Hospital, Luoyang, Henan 471003, P.R. China.
authors.forename: Haiping
authors.initials: H
authors.lastname: Yang
authors.affiliation: Medical College, Henan University of Science and Technology, Luoyang, Henan 471003, P.R. China.
authors.forename: Yanming
authors.initials: Y
authors.lastname: Feng
keywords: leukemia; meta-analysis; multidrug resistance gene; polymorphism; susceptibility