Intestinal Research

Yasushi Iwao

3 Articles

IBD

Ulcerative colitis-associated neoplasms often harbor poor prognostic histologic components with low detection by biopsy: Ryoya Sakakibara, Shinya Sugimoto, Kaoru Takabayashi, Hiroki Kiyohara, Yusuke Wakisaka, Yuta Kaieda, Miho Kawaida, Yusuke Yoshimatsu, Tomohisa Sujino, Naoki Hosoe, Motohiko Kato, Masayuki Shimoda, Yohei Mikami, Yasushi Iwao, Takanori Kanai; Intest Res 2024;22(4):428-438. Published online May 7, 2024; DOI: https://doi.org/10.5217/ir.2024.00006

Abstract PDF PubReader ePub: Background/Aims
Poorly differentiated adenocarcinoma, signet-ring cell carcinoma, and mucinous adenocarcinoma (por/sig/muc), which are considered to be histologic subtypes with a poor prognosis, occur more frequently with colitis-associated cancer than with sporadic tumors. However, their invasiveness and manifestations are unclear. This study aimed to determine the prevalence of the por/sig/muc component in ulcerative colitis-associated neoplasms (UCANs) and its association with invasiveness and to clarify its clinicohistologic and endoscopic features.
Methods
This retrospective observational study included patients diagnosed with ulcerative colitis-associated high-grade dysplasia or adenocarcinoma from 1997 to 2022 who were divided according to the presence or absence of a por/sig/muc component.
Results
Thirty-five patients had UCAN with a por/sig/muc component and 66 had UCAN without this component. The 5-year survival rate was significantly lower in the por/sig/muc group than in the tub group (67% vs. 96%, P= 0.001), which was attributed to disease above stage III and depth to below the subserosa. Biopsy-based diagnosis before resection detected a por/sig/muc component in only 40% of lesions (14/35). Lesions with a por/sig/muc component were prevalent even in the early stages: stage 0 (4/36, 11%), I (8/20, 40%), II (7/12, 58%), III (10/14, 71%), and IV (6/8, 75%).
Conclusions
This is the first investigation that shows UCANs with a por/sig/muc component tended to be deeply invasive and were often not recognized preoperatively. Endoscopists should be aware that UCAN often has a por/sig/muc component that is not always recognized on biopsy, and the optimal treatment strategy needs to be carefully considered.

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IBD

Risk of venous thromboembolism with a central venous catheter in hospitalized Japanese patients with inflammatory bowel disease: a propensity score-matched cohort study: Yasuhiro Aoki, Hiroki Kiyohara, Yohei Mikami, Kosaku Nanki, Takaaki Kawaguchi, Yusuke Yoshimatsu, Shinya Sugimoto, Tomohisa Sujino, Kaoru Takabayashi, Naoki Hosoe, Haruhiko Ogata, Yasushi Iwao, Takanori Kanai; Intest Res 2023;21(3):318-327. Published online February 10, 2023; DOI: https://doi.org/10.5217/ir.2022.00116

Abstract PDF Supplementary Material PubReader ePub

Background/Aims
Thromboprophylaxis is recommended for hospitalized patients with inflammatory bowel disease (IBD) in Western countries, although it is selectively administered to high-risk patients in East Asia. A central venous catheter (CVC) is commonly placed in patients with IBD. Although CVC placement is considered a risk factor for venous thromboembolism (VTE), the degree of increased risk in patients with IBD is uncertain. This study aimed to identify the risk of VTE with CVC placement in hospitalized Japanese patients with IBD without thromboprophylaxis.
Methods
This retrospective cohort study included patients with ulcerative colitis or Crohn’s disease who were admitted for disease flares at Keio University Hospital between January 2016 and December 2020. Patients who already had thrombosis or were administered any antithrombotic treatment on admission were excluded. VTE development during the hospitalization was surveyed, and VTE risk associated with CVC indwelling was estimated using propensity score matching and inverse probability of treatment weighting analyses.
Results
Altogether, 497 hospitalized patients with IBD (ulcerative colitis, 327; Crohn’s disease, 170) were enrolled. VTE developed in 9.30% (12/129) of catheterized patients and in 0.82% (3/368) of non-catheterized patients. The propensity score matching yielded 127 matched pairs of patients. The catheterized group demonstrated higher odds for VTE than the non-catheterized group (odds ratio, 13.15; 95% confidence interval, 1.68–102.70). A similar result was obtained in the inverse probability of treatment weighting analysis (odds ratio, 11.02; 95% confidence interval, 2.64–46.10).
Conclusions
CVC placement is a major risk factor for VTE among hospitalized Japanese patients with IBD without thromboprophylaxis.

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Incidence of Venous Thromboembolism in Asian Patients With Inflammatory Bowel Disease: A Systematic Review and Meta‐Analysis
Joo Hye Song, Sung Ryul Shim, Dae Sung Kim, Hoon Sup Koo, Kyu Chan Huh
Journal of Gastroenterology and Hepatology.2025; 40(4): 774. CrossRef
Safety and effectiveness of tofacitinib in Korean adult patients with ulcerative colitis: post-marketing surveillance study
Hyuk Yoon, Byong Duk Ye, Sang-Bum Kang, Kang-Moon Lee, Chang Hwan Choi, Joo-young Jo, Juwon Woo, Jae Hee Cheon
BMC Gastroenterology.2024;[Epub] CrossRef

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IBD

5-Aminosalicylic acid aggravates colitis mimicking exacerbation of ulcerative colitis: Jun Miyoshi, Katsuyoshi Matsuoka, Atsushi Yoshida, Makoto Naganuma, Tadakazu Hisamatsu, Tomoharu Yajima, Nagamu Inoue, Susumu Okamoto, Yasushi Iwao, Haruhiko Ogata, Fumiaki Ueno, Toshifumi Hibi, Takanori Kanai; Intest Res 2018;16(4):635-640. Published online October 10, 2018; DOI: https://doi.org/10.5217/ir.2018.00015

Abstract PDF PubReader ePub

Ulcerative colitis (UC) is one of the major clinical phenotypes of inflammatory bowel diseases. Although 5-aminosalicylic acid (5-ASA) is widely used for UC and its efficacy and safety have been demonstrated, a few patients paradoxically develop a severe exacerbation of colitis by 5-ASA administration. It is crucial to know clinical features including endoscopic findings in this condition for making a correct diagnosis and a prompt decision to withdraw the medication. Here, we report case series with UC exacerbated by 5-ASA. Medical records of 8 UC patients experiencing an exacerbation of colitis after induction of 5-ASA that was improved by the withdrawal of 5-ASA but also re-aggravated by dose increase or re-administration of 5-ASA were reviewed. The patients were newly diagnosed with UC, started 5-ASA and developed an exacerbation in approximately 2 to 3 weeks. They did not appear to have systemic allergic reactions. Seven of the 8 patients had a high fever. Three of 5 patients who undertook total colonoscopy showed right-side-dominant colitis. These findings suggest clinical characteristics in this condition. Further assessment of clinical and endoscopic features in more cases is necessary for establishing diagnostic criteria and understanding underlying mechanisms in those cases where 5-ASA aggravates the colitis.

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Secondary loss‐of‐response associated with intolerance to Janus kinase inhibitor in a boy with ulcerative colitis
Yuka Minoura, Koji Yokoyama, Yuko Okada, Shinya Fukuda, Hideki Kumagai
Pediatrics International.2025;[Epub] CrossRef
Krill Oil and Its Bioactive Components as a Potential Therapy for Inflammatory Bowel Disease: Insights from In Vivo and In Vitro Studies
Yingying Liu, Ainsley M. Robinson, Xiao Qun Su, Kulmira Nurgali
Biomolecules.2024; 14(4): 447. CrossRef
Ziziphus jujuba Miller Ethanol Extract Restores Disrupted Intestinal Barrier Function via Tight Junction Recovery and Reduces Inflammation
Ye Yang, Min Kim, Ho Lee, Won-Yung Lee, Ju-Hye Yang, Hun Kim, Min Shim, Ji Heo, Jae Son, Woo Kim, Gon Kim, Hu-Jang Lee, Young-Woo Kim, Kwang Kim, Kwang Park
Antioxidants.2024; 13(5): 575. CrossRef
Characteristics of Mucosa-Associated Microbiota in Ulcerative Colitis Patients with 5-Aminosalicylic Acid Intolerance
Hiroshi Matsumoto, Momoyo Sasahira, Tei Tei Go, Shogen Yo, Takehiro Ninomiya, Motoyasu Osawa, Osamu Handa, Eiji Umegami, Ryo Inoue, Akiko Shiotani
Biomedicines.2024; 12(9): 2125. CrossRef
Phage cocktail inhibits inflammation and protects the integrity of the intestinal barrier in dextran sulfate sodium-induced colitis mice model
Jiazhen Xu, Ting Liu, Yingchun Shao, Qing Liu, Zongying Zhang, Yang Yuan, Shuangshuang Zhang, Yanhong Wang, Li Sun, Sha Zhou, Minglu Hao, Haoren Xiu, Xiaohui Xing, Dongming Xing
Microbial Pathogenesis.2024; 197: 107053. CrossRef
Risk factors for intolerance of oral 5‐aminosalicylic acid preparations in pediatric ulcerative colitis
Naoki Abe, Naomi Iwata, Ryuhei Yasuoka, Daisuke Nishida, Asami Oohara, Haruna Nakaseko, Shiro Sugiura, Shinji Kawabe
Pediatrics International.2023;[Epub] CrossRef
Significance of 5-Aminosalicylic Acid Intolerance in the Clinical Management of Ulcerative Colitis
Yohei Mikami, Junya Tsunoda, Shohei Suzuki, Ichiro Mizushima, Hiroki Kiyohara, Takanori Kanai
Digestion.2023; 104(1): 58. CrossRef
APE1/Ref-1 as a Therapeutic Target for Inflammatory Bowel Disease
Lauren Sahakian, Ainsley M. Robinson, Linda Sahakian, Rhian Stavely, Mark R. Kelley, Kulmira Nurgali
Biomolecules.2023; 13(11): 1569. CrossRef

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