Lapatinib-induced liver injury characterized by class II HLA and Gilbert's syndrome genotypes

Clinical Pharmacology and Therapeutics
Colin F SpraggsC T Dollery

Abstract

Lapatinib is a clinically important component of the treatment for HER2-positive metastatic breast cancer and has an acceptable safety profile. Lapatinib-associated Hy's Law cases have been characterized using human leukocyte antigen (HLA) DQA1*02:01/DRB1*07:01 and Gilbert's syndrome UGT1A1*28/*28 genotypes. The HLA-positive cases had higher alanine aminotransferase (ALT) elevation, whereas the HLA-negative cases had a higher incidence of Gilbert's syndrome. The findings of our study, which extend this HLA association to lapatinib-associated serious liver injury, emphasize the importance of Gilbert's syndrome in the interpretation of Hy's Law and may lead to methods for enhancing patient safety.

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