title: ABCB1 gene C3435T polymorphism and drug resistance in epilepsy: evidence based on 8,604 subjects.
abstract: BACKGROUND
  The present study aimed to assess the role of C3435T polymorphism in drug-resistance in epilepsy by a meta-analysis.
  
  
  METHODS
  Databases were obtained from the Cochrane Library, MEDLINE, EMBASE, PubMed, Science Direct database, CNKI, and Wanfang up to October 2014. All the case-control association studies evaluating the role of ABCB1 C3435T in pharmacoresistance to anti-epileptic drug (AED) were identified. RevMan 5.0 software was utilized to perform quantitative analyses in an allele model (C vs. T) and a genotype model (CC vs. CT+TT).
  
  
  RESULTS
  From the 189 potential studies, we included 28 articles for the meta-analysis, including 30 independent case-control studies involving 4124 drug-resistant epileptic patients and 4480 epileptic patients for whom drug treatment was effective. We excluded 164 studies because of duplication, lack of genotype data, and non-clinical research. We found that C3435T polymorphism was not significantly associated with drug resistance in epilepsy, either in allele model (C vs. T: OR=1.07; 95%CI: 0.95-1.19) or in genotype model (CC vs. CT+TT: OR=1.05; 95%CI: 0.89-1.24, P=0.55). Subgroup analyses suggested that in Caucasian populations there are significant differences between resistance group (NR) and control group (R) in both allele model (C vs. T: OR=1.09; 95%CI: 1.00-1.18, P=0.05) and genotype model (CC vs. CT+TT: OR=1.20; 95%CI: 1.04-1.40, P=0.01). However, we did not find this association in Asian populations.
  
  
  CONCLUSIONS
  We conclude that the ABCB1 C3435T polymorphism may be a genetic marker for drug resistance in epilepsy in Caucasian populations.
authors: Department of Endocrinology, Chinese Medicine Hospital in Linyi, Linyi, Shandong, China (mainland).
authors: Shu-Xia
authors: SX
authors: Li
authors: Department of Neurology, Linyi People's Hospital, Linyi, Shandong, China (mainland).
authors: Yun-Yong
authors: YY
authors: Liu
authors: Department of Neurology, Linyi People's Hospital, Linyi, Shandong, China (mainland).
authors: Quan-Bao
authors: QB
authors: Wang
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000235:genetics; D004351:Drug Resistance / Q000235:genetics*; D004827:Epilepsy / Q000188:drug therapy* / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D017594:Publication Bias; D044465:White People
chemical_list: C513055:ABCB1 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B