Abstract:
OBJECTIVE:Asians who carry the HLA-B*1502 allele have an elevated risk of developing Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) when treated with the antiepileptic drugs (AEDs) carbamazepine (CBZ) and phenytoin (PHT). With a focus on Singapore, this analysis identifies circumstances in which genotyping and targeted treatment with alternative AEDs that do not induce SJS/TEN is likely to be more cost-effective than 1) treatment with CBZ or PHT without genotyping or 2) providing a more expensive drug that does not induce SJS/TEN to all patients without genotyping. METHODS:A decision tree model was developed in TreeAge. The model takes into account costs of epilepsy treatments and genotyping, reductions in quality of life and increased costs resulting from SJS/TEN complications, the prevalence of the risk allele, the positive predictive value (PPV) of genotyping, life expectancy, and other factors. RESULTS:Compared with no genotyping and providing CBZ to all, genotyping results in an incremental cost-effectiveness ratio of $37,030/quality-adjusted life year (QALY) for Chinese patients, $7,930/QALY for Malays, and $136,630/QALY for Indians in Singapore. CONCLUSIONS:Because of the different population allele frequencies of HLA-B*1502 among different ethnic groups, genotyping for HLA-B*1502 and providing alternate AEDs to those who test positive is cost-effective for Singaporean Chinese and Malays, but not for Singaporean Indians. Population frequency of HLA-B*1502, PPV, duration of treatment relative to life expectancy, and costs of alternative drugs are the key drivers influencing cost-effectiveness.
journal_name
Neurologyjournal_title
Neurologyauthors
Dong D,Sung C,Finkelstein EAdoi
10.1212/WNL.0b013e31826aac73subject
Has Abstractpub_date
2012-09-18 00:00:00pages
1259-67issue
12eissn
0028-3878issn
1526-632Xpii
WNL.0b013e31826aac73journal_volume
79pub_type
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