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HLA‐B*38:02:01 predicts carbimazole/methimazole‐induced agranulocytosis

2015; Wiley; Volume: 99; Issue: 5 Linguagem: Inglês

10.1002/cpt.309

1532-6535

Ching‐Lung Cheung, C. Y. Sing, Clara Sze-Man Tang, VKF Cheng, Munir Pirmohamed, C‐H Choi, C‐S Hung, EY‐F Lau, Ckf Lee, MW‐H Mak, JYY Leung, T‐W Wong, AYY Ho, K. L. Chan, VHF Hung, Vicki Ho-Kee Tam, SC Siu, HK Pang, WZ‐M Wat, HH‐Y Lee, C‐T Chung, RS‐M Hue, PC Sham, Bmy Cheung, Ian Chi Kei Wong, Kcb Tan, AWC Kung,

Thyroid Disorders and Treatments

Thioamides antithyroid-drugs (ATDs) are important in hyperthyroid disease management. Identification of the susceptibility locus of ATD-induced agranulocytosis is important for clinical management. We performed a genome-wide association study (GWAS) involving 20 patients with ATD-induced agranulocytosis and 775 healthy controls. The top finding was further replicated. A single-nucleotide polymorphism (SNP), rs185386680, showed the strongest association with ATD-induced agranulocytosis in GWAS (odds ratio (OR) = 36.4; 95% confidence interval (CI) = 12.8-103.7; P = 1.3 × 10(-24)) and replication (OR = 37; 95% CI = 3.7-367.4; P = 9.6 × 10(-7)). HLA-B*38:02:01 was in complete linkage disequilibrium with rs185386680. High-resolution HLA typing confirmed that HLA-B*38:02:01 was associated with carbimazole (CMZ)/methimazole (MMI)-induced agranulocytosis (OR = 265.5; 95% CI = 27.9-2528.0; P = 2.5 × 10(-14)), but not associated with propylthiouracil (PTU). The positive and negative predictive values of HLA-B*38:02:01 in predicting CMZ/MMI-induced agranulocytosis were 0.07 and 0.999. Approximately 211 cases need to be screened to prevent one case. Screening for the risk allele will be useful in preventing agranulocytosis in populations in which the frequency of the risk allele is high.