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Background:  Lamotrigine (LTG) is commonly used for treatment of epilepsy and bipolar disorder. It is one of the common cause of cutaneous adverse drug reactions (CADR). Clinical symptoms of LTG-induced CADR range from maculopapular exanthema (MPE) to severe cutaneous adverse reactions (SCAR). This study aimed to determine the association of the LTG-induced CADR with human leukocyte antigen ( HLA ) alleles in Thai patients.   Methods:  Fifteen patients with LTG-induced CADR [10 MPE; 4 Stevens–Johnson syndrome; and 1 drug reaction with eosinophilia and systemic symptoms] and 50 LTG-tolerant controls were included in the study.  HLA-A  and  HLA-B  genotyping was performed using polymerase chain reaction-sequence-specific oligonucleotides probes.   Results:  The proportion of  HLA-A ∗ 02:07  and  HLA-B ∗ 15:02  allele carriers were significantly higher in the LTG-induced CADR group than in the tolerant controls [odds ratio (OR): 7.83; 95% confidence interval (CI): 1.60–38.25;  P  = 0.013, and OR: 4.89; 95% CI: 1.28–18.67;  P  = 0.014]. In addition, subjects with  HLA-A ∗ 33:03 ,  HLA-B ∗ 15:02 , and  HLA-B ∗ 44:03  were significantly higher in the LTG-induced MPE group than in the tolerant controls (OR: 8.27; 95% CI: 1.83–37.41;  P  = 0.005, OR: 7.33; 95% CI: 1.63–33.02;  P  = 0.005; and OR: 10.29; 95% CI: 1.45–72.81;  P  = 0.029). In contrast to the LTG-induced MPE group, there were no significant differences between  HLA  alleles and LTG-induced SCAR group.   Conclusion:   HLA-A ∗ 02:07  and  HLA-B ∗ 15:02  were associated with LTG-induced CADR in Thai patients. We also identified an association between  HLA-A ∗ 33:03 ,  HLA-B ∗ 15:02 , and  HLA-B ∗ 44:03  and LTG-induced MPE in this population. These results suggest that these alleles could be useful screening markers for preventing CADR before LTG treatment in Thai patients, but further replication studies with larger sample sizes are needed.

Association of HLA-A and HLA-B Alleles with Lamotrigine-Induced Cutaneous Adverse Drug Reactions in the Thai Population