RT Book, Section A1 Booth, Ronald A. A1 Ansari, Mohammed T. A2 Murray, Michael F. A2 Babyatsky, Mark W. A2 Giovanni, Monica A. A2 Alkuraya, Fowzan S. A2 Stewart, Douglas R. SR Print(0) ID 1102698482 T1 Thiopurine Methyltransferase Pharmacogenetics T2 Clinical Genomics: Practical Applications in Adult Patient Care YR 2014 FD 2014 PB McGraw-Hill Education PP New York, NY SN 9780071622448 LK accessmedicine.mhmedical.com/content.aspx?aid=1102698482 RD 2024/04/19 AB Clinical utility of thiopurine methyltransferase analysis:Various guidelines recommend pre-thiopurine therapy thiopurine methyltransferase (TPMT) assessment in managing chronic inflammatory conditions.There is insufficient evidence base to recommend pretherapy TPMT assessment.Decreased or absent TPMT activity is associated with increased risk of myelotoxicity and leukopenia in patients treated with thiopurine medications (azathioprine [AZA] or 6-mercaptopurine [6-MP]).Decreased or absent TPMT activity is not associated with hepatitis or pancreatitis in patients treated with thiopurine medications (AZA or 6-MP).Reduced or absent TPMT activity does not place patients at risk of disease.