Pharmacogenetic testing for uridine diphosphate glucuronosyltransferase 1A1 polymorphisms: Are we there yet?

Minoli A. Perera, Federico Innocenti, Mark J. Ratain

Research output: Contribution to journalReview articlepeer-review

52 Scopus citations


Recent changes to the labels of three prescription drugs - irinotecan, 6-mercaptopurine, and warfarin - include recommendations for pharmacogenetic testing in patients. Thus, clinicians are faced with determining the utility and practicality of pharmacogenetic testing in clinical practice. We illustrate the clinical implications that this testing may have using irinotecan, an agent approved for the treatment of metastatic colorectal cancer, as an example. A clinical association between the drug's active metabolite and toxicity has been found. By performing uridine diphosphate glucuronosyltransferase (UGT) 1A1 genetic testing, some studies have been able to predict which patients receiving irinotecan will experience the toxicity. Thus, irinotecan's package insert was revised to include a recommendation for such testing. In addition, the United States Food and Drug Administration approved a clinical test for the UGT1A1*28 allele. These events demonstrate that pharmacogenetics has entered the realm of clinical practice. However, the transition from bench to bedside of these tests has distinct challenges such as population differences, test sensitivity, and the role of other genetic and nongenetic factors that influence drug toxicity. In addition, ethical and logistic implications of pharmacogenetic testing exist.

Original languageEnglish (US)
Pages (from-to)755-768
Number of pages14
Issue number6
StatePublished - Jun 2008


  • Irinotecan
  • Pharmacogenetics
  • UGT1A1
  • Uridine diphosphate glucuronosyltransferase

ASJC Scopus subject areas

  • Pharmacology (medical)


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