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Tetsuya Takagawa 2 Articles
NUDT15, FTO, and RUNX1 genetic variants and thiopurine intolerance among Japanese patients with inflammatory bowel diseases
Toshiyuki Sato, Tetsuya Takagawa, Yoichi Kakuta, Akihiro Nishio, Mikio Kawai, Koji Kamikozuru, Yoko Yokoyama, Yuko Kita, Takako Miyazaki, Masaki Iimuro, Nobuyuki Hida, Kazutoshi Hori, Hiroki Ikeuchi, Shiro Nakamura
Intest Res 2017;15(3):328-337.   Published online June 12, 2017
DOI: https://doi.org/10.5217/ir.2017.15.3.328
AbstractAbstract PDFPubReaderePub
<b>Background/Aims</b><br/>

Recent genome-wide analyses have provided strong evidence concerning adverse events caused by thiopurine drugs such as azathioprine (AZA) and 6-mercaptopurine. The strong associations identified between NUDT15 p.Arg139Cys and thiopurine-induced leukopenia and severe hair loss have been studied and confirmed over the last 2 years. However, other coding variants, including NUDT15 p.Val18_Val19insGlyVal, NUDT15 p.Val18Ile, and FTO p.Ala134Thr, and a noncoding variation in RUNX1 (rs2834826) remain to be examined in detail in this respect. Therefore, we investigated the correlation between these adverse events and the 5 recently identified variants mentioned above among Japanese patients with inflammatory bowel diseases (IBD).

Methods

One hundred sixty thiopurine-treated patients with IBD were enrolled. Genotyping was performed using TaqMan SNP Genotyping Assays or Sanger sequencing.

Results

None of the 5 variants were associated with gastrointestinal intolerance to AZA. However, NUDT15 p.Arg139Cys was significantly associated with the interval between initiation and discontinuation of AZA among patients with gastrointestinal intolerance. This variant was strongly associated with early (<8 weeks) and late (≥8 weeks) leukopenia and severe hair loss. Moreover, it correlated with the interval between initiation of thiopurine therapy and leukopenia occurrence, and average thiopurine dose. NUDT15 p.Val18_Val19insGlyVal, NUDT15 p.Val18Ile, FTO p.Ala134Thr, and RUNX1 rs2834826 exhibited no significant relationship with the adverse events examined.

Conclusions

Of the 5 variants investigated, NUDT15 p.Arg139Cys had the strongest impact on thiopurine-induced leukopenia and severe hair loss; therefore, its genotyping should be prioritized over that of other variants in efforts to predict these adverse events in Japanese patients with IBD.

Citations

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  • NUDT15 codon 139 is the best pharmacogenetic marker for predicting thiopurine-induced severe adverse events in Japanese patients with inflammatory bowel disease: a multicenter study
    Yoichi Kakuta, Yosuke Kawai, Daisuke Okamoto, Tetsuya Takagawa, Kentaro Ikeya, Hirotake Sakuraba, Atsushi Nishida, Shoko Nakagawa, Miki Miura, Takahiko Toyonaga, Kei Onodera, Masaru Shinozaki, Yoh Ishiguro, Shinta Mizuno, Masahiro Takahara, Shunichi Yanai
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Propensity score-matched real-world comparative treatment outcomes of Janus kinase inhibitors for ulcerative colitis in patients with and without prior exposure to anti-tumor necrosis factor α antibody
Maiko Ikenouchi, Hirokazu Fukui, Soichi Yagi, Akira Nogami, Koji Kaku, Toshiyuki Sato, Mikio Kawai, Koji Kamikozuru, Yoko Yokoyama, Tetsuya Takagawa, Toshihiko Tomita, Taku Kobayashi, Shinichiro Shinzaki
Received September 22, 2024  Accepted November 20, 2024  Published online February 3, 2025  
DOI: https://doi.org/10.5217/ir.2024.00148    [Epub ahead of print]
AbstractAbstract PDFSupplementary MaterialPubReaderePub
Background/Aims
Tofacitinib (TFB), filgotinib (FIL), and upadacitinib (UPA) are Janus kinase (JAK) inhibitors approved for moderate-to-severe ulcerative colitis (UC). The appropriate positioning of each JAK inhibitor in the treatment algorithm, however, is unclear. Furthermore, real-world efficacy of JAK inhibitors for patients with UC and prior anti-tumor necrosis factor α antibody (aTNF) treatment are not fully investigated. We compared the efficacy and safety of 3 JAK inhibitors in patients with UC, considering their prior aTNF exposure.
Methods
A retrospective study was conducted in patients with UC who started TFB, FIL, or UPA at 2 academic centers. This propensity score-matched cohort study assessed the effectiveness of the 3 JAK inhibitors for UC in patients with and without prior aTNF exposure, comparing steroid-free clinical remission and response rates after 8 weeks.
Results
Among 274 patients who met the inclusion criteria, 145 experienced aTNF exposure (TFB: 59.2%, 100/169; FIL: 34.5%, 20/58; UPA: 53.2%, 25/47). Based on propensity score-matching, UPA led to a higher steroid-free clinical remission rates than TFB (adjusted odds ratio [aOR], 5.57; 95% confidence interval [CI], 1.42–21.90) or FIL (aOR, 9.00; 95% CI, 1.42–57.10) in patients exposed to aTNF. Steroid-free clinical remission and clinical response rates did not differ significantly between each group in patients non-exposed to aTNF. The incidence of adverse events was slightly higher with UPA than TFB or FIL.
Conclusions
UPA may be more effective for UC than TFB or FIL, especially in patients with previous aTNF exposure, although consideration should be given to adverse events.
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