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Carbamazepine (CBZ) is a first-line widely used anticonvulsant. It has a narrow therapeutic index and exhibits considerable interindividual and interethnic variability in clinical efficacy and adverse drug reactions including potentially life-threatening hypersensitivity reactions, such as Stevens-Johnson syndrome and toxic epidermal necrolysis. The most important pharmacogenetic finding is related to the association of CBZ-induced hypersensitivity with human leukocyte antigens ( HLA  class I and II alleles). Moreover, genotyping for  HLA-B*15:02  allele is required prior to initiating CBZ in Asians and Asian ancestry patients, demonstrating the usefulness of biomarkers to avoid adverse drug reactions. On the other hand, in order to explain the differences in the clinical response to CBZ, genetic polymorphisms in phase I ( CYP3A4, CYP3A5  and  EPHX1 ) and phase II ( UGT2B7 ) metabolising enzymes have been assessed; additionally, the influence of transporters ( ABCB1  and  ABCC2 ), receptors ( PXR ) and other drug targets (voltage- gated Na+ channels) in CBZ clinical response has been evaluated. To date, these studies are controversial and require further investigations to clarify the functional role of these polymorphisms as potential biomarkers in regard to CBZ therapy.

Pharmacogenetic potential biomarkers for carbamazepine adverse drug reactions and clinical response