Moving Beyond Single Gene-Drug Pairs in Clinical Pharmacogenomics Testing

Wednesday, September 18, 2019 11-Noon
September 18, 2019 11-Noon
Moving Beyond Single Gene-Drug Pairs in Clinical Pharmacogenomics Testing

Pharmacogenomics (PGx) studies the associations between discrete variants in single genes and the phenotype for specific aspects of a drug’s pharmacokinetics or pharmacodynamics. These associations are used to qualify patients for therapy (e.g., CYP2C19 and clopidogrel), to avoid drug-related adverse events (e.g., TPMT and mercaptopurines), and to optimize drug and dose selection (e.g., CYP2D6 and several antidepressants). However, clinical PGx testing based on single gene-drug associations has limited clinical utility when patients take more than one medication. For some drugs, limitations of single gene-drug associations may be mitigated by combining the testing of several pharmacogenes based on single gene-drug associations along with clinical and demographic factors. Emerging evidence shows the benefits of multi-gene panels in clinical PGx testing. This presentation will review examples of single and multi-gene PGx testing applied to drug therapy decisions.

Learning Objectives
  1. Describe the strengths and limitations of pharmacogenomic testing.
  2. List examples of single gene-drug associations with the strongest levels of evidence for clinical implementation.
  3. Discuss cautions when considering the use of multiple gene-drug associations to inform drug therapy decisions.

Gwendolyn A. McMillin, PhD Gwendolyn A. McMillin, PhD
Medical Director, Toxicology
Medical Director, Pharmacogenetics
Scientific Director, Mass Spectrometry

Dr. McMillin is a professor of pathology at the University of Utah School of Medicine. She received her PhD in pharmacology and toxicology from the University of Utah and is certified by the American Board of Clinical Chemistry in clinical chemistry and toxicological chemistry. She is a member of ARUP’s R&D Executive Committee, and is actively involved in professional associations such as the International Association of Therapeutic Drug Monitoring and Clinical Chemistry (IATDMCT), the American Association for Clinical Chemistry (AACC), and the College of American Pathologists (CAP). Her primary interests include detection of neonatal drug exposures, pain management, and clinical applications and implementation of pharmacogenomics.

Yuan Ji, PhD, DABCP, FACMG Yuan Ji, PhD, DABCP, FACMG
Medical Director, Molecular Genetics and Genomics
Medical Director, Pharmacogenomics

Dr. Yuan Ji is an Assistant Professor of Pathology at the University of Utah School of Medicine. She received her PhD in Molecular Pharmacology and Experimental Therapeutics at the Mayo Clinic in Rochester, Minnesota, where she further completed her postdoctoral research fellowship in Pharmacogenomics, an NIH-T32 Clinical Pharmacology fellowship and an ABMGG fellowship in Clinical Molecular Genetics. Dr. Ji received multiple early career development awards and grants, including an NIH-KL2 Mentored Career Award and a Minnesota Partnership for Biotechnology and Medical Genomics Award. Dr. Ji is board certified in both Clinical Pharmacology and Medical Genetics and Genomics. Dr. Ji’s major clinical and research focus is in Pharmacogenomics, i.e., identifying novel Pharmacogenomics markers and accurately testing, interpreting, and reporting pharmacogenomic variants. In addition, Dr. Ji also developed a vast interest in developing cost-effective diagnostic testing for diseases including somatic overgrowth and related syndromes.

Available Continuing Education Credits for this Webinar


  • P.A.C.E.® Credit (1)

The program has been approved for one (1) contact hour through ARUP, which is approved as a provider of continuing education programs in the clinical laboratory sciences by the American Society for Clinical Laboratory Sciences (ASCLS) P.A.C.E.® Program.

  • CEU for Florida (1)

This event is also approved for one (1) CEU of Florida credit and meets the requirements for Molecular Pathology.

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