ABCB1 and epilepsy: However, genotype frequencies of 2677G>T ABCB1 polymorphism did not differ significantly in the drug-resistant versus the drug-responsive epilepsy patients for GT genotype (P = 0.71, OR = 1.14, 95% CI = 0.55–2.36), for TT genotype (P = 0.87, OR = 1.06, 95% CI = 0.49–2.26) and for AT genotype (P = 0.39, OR = 0.53, 95% CI = 0.13–2.24) [Table 5].