Abstract
Purpose
Bilirubin is known to have antioxidant effects. Several pieces of evidence regarding association between serum bilirubin and UC exist. Three studies found that serum bilirubin was inversely associated with severity of ulcerative colitis (UC), but no evidence regarding an association between serum bilirubin and mucosal healing (MH) has yet been shown. Thus, we evaluated this issue among Japanese patients with UC.
Methods
The study subjects consisted of 304 Japanese patients with UC. Serum total bilirubin and indirect bilirubin were divided into quartiles on the basis of the distribution of all study subjects (low, moderate, high, and very high). Several endoscope specialists were responsible for evaluating MH, which was defined as a Mayo endoscopic subscore of 0. The information on clinical remission was collected using medical records.
Results
The mean age was 49.9 years, the percentage of male patients was 59.2%, and the percentage of MH was 29.3%. High serum total bilirubin was independently positively associated with MH (OR 2.26 [95%CI 1.13–4.61]. However, after adjustment for confounding factors, the association between total bilirubin and MH disappeared. Very high serum indirect bilirubin was independently positively associated with MH (OR 2.31 [95%CI 1.10–5.00], p for trend = 0.026). No association between bilirubin and clinical remission was found.
Conclusions
Among Japanese patients with UC, serum indirect bilirubin, but not total bilirubin, was significantly positively associated with MH but not clinical remission.
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Data availability
The datasets analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
The authors would like to thank the Ehime Clinical Network for Alimentary Diseases study group, Yu Hashimoto, Shogo Kitahata, Kazuhiro Tange, Keitarou Kawasaki, Yuji Mizukami, Masayoshi Uraoka, Naozumi Shibata, Sanae Nakamura, Satoshi Imamine, Masamoto Torisu, Makoto Yano, Aki Hasebe, Harumi Yano, Masato Murakami, Masumi Hino, Kikuchi Keiko and Tomo Kogama for their support.
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All statistical analyses were performed using SAS software package version 9.4 (SAS Institute Inc., Cary, NC, USA).
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Yoichi Hiasa contributed to the study conception and design. Material preparation and data collection were performed by Kana Shiraishi, Shinya Furukawa, Sen Yagi, Masakzu Hanayama, Kenichirou Mori, Tomoyuki Ninomiya, Yuji Mizukami, Seiyuu Suzuki, Katsuhisa Ohashi, Hidehiro Murakami, Eiji Takeshita, and Yoshio Ikeda. Data analysis was performed by Shiraishi Kana and Shinya Furukawa. The first draft of the manuscript was written by Kana Shiraishi and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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This research was approved by the institutional review board of the Ehime University Graduate School of Medicine (#1505011).
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Shiraishi, K., Furukawa, S., Yagi, S. et al. Association between serum bilirubin and mucosal healing among Japanese patients with ulcerative colitis: a cross-sectional study. Int J Colorectal Dis 36, 377–382 (2021). https://doi.org/10.1007/s00384-020-03774-w
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DOI: https://doi.org/10.1007/s00384-020-03774-w