ABCB1 and epilepsy: ABCC2 rs717620 -24 CT+TT genotypes and ABCC2 rs3740066 (3972C>T) CT+TT genotypes are overrepresented in epileptic patients resistant to antiepileptic drugs in the Chinese population, whereas ABCC2 rs2273697 (1249G>A) and ABCB1 rs1045642 (3435C>T) polymorphisms were not found to be associated with drug-resistant epilepsy in this population.