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Basic Clin Pharmacol Toxicol. 2011 Jul;109(1):42-6. doi: 10.1111/j.1742-7843.2011.00681.x. Epub 2011 Mar 16.

Hla-B alleles and lamotrigine-induced cutaneous adverse drug reactions in the Han Chinese population.

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1
Institute of Neuroscience and Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and Ministry of Education of China, Guangzhou, China.

Abstract

Lamotrigine (LTG) is a commonly used antiepileptic drug. However, the use of LTG is limited because of its cutaneous adverse drug reactions (cADRs) ranging from mild maculopapular eruption (MPE) to severe Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN). A strong association between HLA-B*1502 and carbamazepine-induced SJS/TEN has been identified in Chinese and Thai. Although three of seven cases with HLA-B*1502 have been reported in LTG-induced SJS/TEN so far, the relationship between HLA-B*1502 and LTG-induced SJS/TEN needs further investigation. It is also unclear whether there is a specific genetic marker associated with LTG-induced MPE in Chinese. In this study, we genotyped 43 Han Chinese patients treated with LTG (14 cases with LTG-induced cADRs and 29 LTG-tolerant controls), using PCR-SSP for HLA-B*1502 testing and low-resolution genotyping, as well as sequencing for four-digit genotyping. The two cases with SJS were negative for HLA-B*1502, with B1301/1301 and 4601/5610, respectively. Combining the data with previous studies, there was no significant difference in the frequency of subjects with HLA-B*1502 between the LTG-induced SJS/TEN group and the LTG-tolerant group (pā€ƒ=ā€ƒ0.08, OR 4.23, 95% CI 0.94-18.97). In the MPE group, only one was positive for HLA-B*1502. There was no significant difference in the frequency of a specific HLA-B allele between the MPE group and the LTG-tolerant group either. In this study, no significant association between HLA-B*1502 and LTG-induced SJS or MPE was found. Given the small sample size and only HLA-B locus genotyping, further large-scale studies are required to explore genetic associations with LTG-induced cADRs.

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