ABSTRACT
Tranilast (N-(3′4′-demethoxycinnamoyl)-anthranilic acid (N-5)) is an investigational drug for the prevention of restenosis following percutaneous transluminal coronary revascularization. An increase in bilirubin levels was observed in 12% of patients upon administration of tranilast in a phase III clinical trial. To identify the potential genetic factors that may account for the drug-induced hyperbilirubinemia, we examined polymorphisms in the uridine diphosphate glucuronosyltransferase 1A1 (UGT1A1) gene in over a thousand patients. Our results suggested that the TA repeat polymorphism in UGT1A1, which predisposes some individuals to Gilbert's syndrome, predicted the susceptibility to tranilast-induced hyperbilirubinemia. The (TA)7/(TA)7 genotype was present in 39% of the 127 hyperbilirubinemic patients vs 7% of the 909 controls (P=2 × 10−22). Rapid identification of genetic factors accounting for the observed adverse effect during the course of a double-blind clinical trial demonstrated the potential application of pharmacogenetics in the clinical development of safe and effective medicines.
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Abbreviations
- PRESTO:
-
Prevention of REStenosis with Tranilast and its Outcomes
- PTCR:
-
percutaneous transluminal coronary revascularization
- SNP:
-
single-nucleotide polymorphism
- UGT1A1:
-
uridine diphosphate glucuronosyltransferase 1A1
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Acknowledgements
We thank the significant contribution of our colleagues in Genetics Research, Clinical Pharmacology and Discovery Medicine. Thanks are also due to the tranilast clinical team, the principal investigators and patients who participated in this study. This study was wholly funded by GSK Research and Development.
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Danoff, T., Campbell, D., McCarthy, L. et al. A Gilbert's syndrome UGT1A1 variant confers susceptibility to tranilast-induced hyperbilirubinemia. Pharmacogenomics J 4, 49–53 (2004). https://doi.org/10.1038/sj.tpj.6500221
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DOI: https://doi.org/10.1038/sj.tpj.6500221
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