ABCB1 and epilepsy: Several of the many association studies on ABCB1 in epilepsy not only analyzed drug-responsive and -nonresponsive epilepsy patients but also analyzed the ABCB1 genotypes in control subjects without epilepsy, and found that in fact ABCB1 genotypes were associated with the disease per se rather than specifically with drug responsiveness.[14] In our study from patients with south Indian ancestry (unpublished), we also had similar findings but with a different SNP from the ABCB1 gene.