title: 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.
abstract: 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.
authors: Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea.
authors: Yoon Suk
authors: YS
authors: Jung
authors: Jae Hee
authors: JH
authors: Cheon
authors: Jae Jun
authors: JJ
authors: Park
authors: Chang Mo
authors: CM
authors: Moon
authors: Eun Soo
authors: ES
authors: Kim
authors: Jin Ha
authors: JH
authors: Lee
authors: Seung Won
authors: SW
authors: Kim
authors: Jae Hak
authors: JH
authors: Kim
authors: Sung Pil
authors: SP
authors: Hong
authors: Tae Il
authors: TI
authors: Kim
authors: Won Ho
authors: WH
authors: Kim
mesh_terms: D044466:Asian People / Q000235:genetics*; D001379:Azathioprine / Q000627:therapeutic use; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000188:drug therapy / Q000235:genetics*; D015122:Mercaptopurine / Q000627:therapeutic use; D008780:Methyltransferases / Q000235:genetics*; D011755:Pyrophosphatases / Q000235:genetics*; D012008:Recurrence; D016896:Treatment Outcome; D000097630:Inosine Triphosphatase
chemical_list: D001379:Azathioprine; D015122:Mercaptopurine; D008780:Methyltransferases; D011755:Pyrophosphatases; C022745:thiopurine methyltransferase; C511829:ITPA protein, human; D000097630:Inosine Triphosphatase