Correlation of genotypes for thiopurine methyltransferase and inosine triphosphate pyrophosphatase with long-term clinical outcomes in Korean patients with inflammatory bowel diseases during treatment with thiopurine drugs

Yoon Suk Jung, Jae Hee Cheon, Jae Jun Park, Chang Mo Moon, Eun Soo Kim, Jin Ha Lee, Seung Won Kim, Jae Hak Kim, Sung Pil Hong, Tae Il Kim, Won Ho Kim

Research output: Contribution to journalArticle

14 Citations (Scopus)


There is a lack of research describing the associations between thiopurine methyltransferase (TPMT)/inosine triphosphate pyrophosphatase (ITPA) genotypes and long-term clinical outcomes. We investigated whether TPMT/ITPA genotypes predicted long-term clinical response in Korean patients with inflammatory bowel diseases (IBDs) undergoing thiopurine treatment. A total of 204 patients with IBD in whom thiopurine treatment was indicated were enrolled and categorized by TPMT and ITPA genotypes. Long-term follow-up clinical data for these patients were analyzed with specific focus on disease relapse. Of the 204 patients, 162 (79.4%) patients using thiopurines achieved remission and were included in an analysis of long-term clinical outcomes. There were no significant differences in disease relapse-free survival between wild and mutant types of TPMT (P=0.903) or ITPA (P=0.392), according to the results of the log-rank analysis. Our study suggests that TPMT and ITPA genotypes may not affect the rates of disease relapse in IBD patients treated with thiopurines. Further studies are indicated to confirm the utility of TPMT/ITPA genotyping to guide clinicians formulating individualized treatments for IBD patients requiring thiopurine therapy.

Original languageEnglish
Pages (from-to)121-123
Number of pages3
JournalJournal of human genetics
Issue number2
Publication statusPublished - 2010 Feb 1


All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

Cite this