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Jun YK, Oh HJ, Lee JA, Choi Y, Shin CM, Park YS, Kim N, Lee DH, Yoon H. The Potential of Molecular Remission: Tissue Neutrophil Elastase Is Better Than Histological Activity for Predicting Long-Term Relapse in Patients With Ulcerative Colitis in Endoscopic Remission. Inflamm Bowel Dis 2024:izae194. [PMID: 39191527 DOI: 10.1093/ibd/izae194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Indexed: 08/29/2024]
Abstract
BACKGROUND Growing interest exists in deep remission, beyond clinical and endoscopic remission, to enhance long-term prognosis in patients with ulcerative colitis (UC). Our study aimed to evaluate the risk of relapse according to tissue expression levels of calprotectin and neutrophil elastase (NE) in patients with quiescent UC. METHODS Rectal biopsies were performed on 218 patients with UC in clinical and endoscopic remission. Histological activity was prospectively scored using the Robarts Histological Index. Tissue calprotectin and NE levels were evaluated using immunohistochemistry. Optimal tissue calprotectin and NE cutoffs for relapse were determined using log-rank analysis. Cox proportional hazard analyses evaluated relapse risk factors. RESULTS Tissue calprotectin and NE levels were significantly higher in patients with histological activity than in those in histological remission (P < .001). The optimal cutoffs of tissue calprotectin and NE for relapse were 10.61 and 22.08 per mm2, respectively. The 3-year clinical relapse risk was significantly lower in the low-tissue NE group than in the high-tissue NE group (P = .009); however, it did not differ between the low- and high-tissue calprotectin group (P = .094). In multivariate analyses, a low level of tissue NE expression was independently associated with a lower risk of 3-year clinical relapse (adjusted hazard ratio = 0.453, 95% confidence interval = 0.225-0.911, P = .026), unlike histological index and tissue calprotectin. CONCLUSIONS In patients with UC who have achieved clinical and endoscopic remission, tissue expression of NE is a better predictor of long-term relapse than histological activity.
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Affiliation(s)
- Yu Kyung Jun
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Hyeon Jeong Oh
- Department of Pathology, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Ji Ae Lee
- Department of Pathology, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Yonghoon Choi
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Cheol Min Shin
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Young Soo Park
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Nayoung Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Dong Ho Lee
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Hyuk Yoon
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
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2
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Subudhi RN, Poonia N, Singh D, Arora V. Natural approaches for the management of ulcerative colitis: evidence of preclinical and clinical investigations. NATURAL PRODUCTS AND BIOPROSPECTING 2024; 14:42. [PMID: 39078427 PMCID: PMC11289194 DOI: 10.1007/s13659-024-00463-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Accepted: 07/07/2024] [Indexed: 07/31/2024]
Abstract
Ulcerative colitis (UC) is a recurring autoimmune disorder characterized by persistent inflammation in the mucosal lining of the lower part of the large intestine. Conventional treatment options such as salicylates, corticosteroids, and immunosuppressants often come with severe side effects, limited bioavailability, and the development of drug resistance, which hampers their therapeutic effectiveness. Therefore, it is imperative to explore natural strategies as safe and alternative treatments for UC. Currently, around 40% of UC patients find relief through natural constituents, which can help reduce toxic side effects and maintain clinical remission. This review aims to provide a summary of both preclinical and clinical evidence supporting the efficacy of various natural substances in the prophylaxis of UC. These natural options include plant extracts, essential oils, nutraceuticals, and phytochemicals. Furthermore, we will delve into the potential mechanisms that underlie the protective and curative actions of these novel herbal agents. In summary, this review will explore the effectiveness of natural remedies for UC, shedding light on their preclinical and clinical findings and the mechanisms behind their therapeutic actions. These alternatives offer hope for improved treatment outcomes and reduced side effects for individuals suffering from this challenging autoimmune condition.
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Affiliation(s)
- Rudra Narayan Subudhi
- Department of Pharmaceutics, University Institute of Pharma Sciences, Chandigarh University, Gharuan, Mohali, Punjab, India
| | - Neelam Poonia
- Department of Pharmaceutics, University Institute of Pharma Sciences, Chandigarh University, Gharuan, Mohali, Punjab, India.
| | - Dilpreet Singh
- Department of Pharmaceutics, University Institute of Pharma Sciences, Chandigarh University, Gharuan, Mohali, Punjab, India
| | - Vimal Arora
- Department of Pharmaceutics, University Institute of Pharma Sciences, Chandigarh University, Gharuan, Mohali, Punjab, India
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3
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Vermeire S, Hanzel J, Löwenberg M, Ferrante M, Bossuyt P, Hoentjen F, Franchimont D, Palatka K, Peeters H, Mookhoek A, de Hertogh G, Molnár T, van Moerkercke W, Lobatón T, Clasquin E, Hulshoff MS, Baert F, D'Haens G. Early Versus Late Use of Vedolizumab in Ulcerative Colitis: Clinical, Endoscopic, and Histological Outcomes. J Crohns Colitis 2024; 18:540-547. [PMID: 37934813 DOI: 10.1093/ecco-jcc/jjad179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Indexed: 11/09/2023]
Abstract
BACKGROUND AND AIMS We explored the potential for differential efficacy of vedolizumab between early and late ulcerative colitis [UC] with evaluation of clinical, endoscopic, and histological endpoints. METHODS This was a multicentre, multinational, open-label study in patients with moderately-to-severely active UC, defining early UC by a disease duration <4 years and bio-naïve and late UC by a disease duration > 4 years and additional exposure to tumour necrosis factor antagonists. Patients received standard treatment with intravenous vedolizumab for 52 weeks [300 mg Weeks 0, 2, 6, every 8 weeks thereafter without escalation]. The primary endpoint was corticosteroid-free clinical remission with endoscopic improvement [total Mayo score ≤2 with no subscore >1] at both Weeks 26 and 52. RESULTS A total of 121 patients were included: in the "early" group, 25/59 [42.4%] achieved the primary endpoint versus 19/62 [30.6%] in the "late" group [p = 0.18]. There were no significant differences between the two groups in endoscopic improvement [Week 26: "early" 32/59 [54.2%] versus "late" 29/62 [46.8%]; p = 0.412; Week 52: 27/59 [45.8%] versus 25/62 [40.3%]; p = 0.546] or in histological remission [Robarts Histopathology Index <3 without neutrophils in the epithelium and lamina propria] [Week 26: 24/59 [40.7%] versus 21/62 [33.9%]; p = 0.439; Week 52: 22/59 [37.3%] versus 22/62 [35.5%]; p = 0.837]. CONCLUSIONS No significant differences in clinical, endoscopic, and histological outcomes were observed between "early" and "late" disease.
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Affiliation(s)
- Séverine Vermeire
- Department of Gastroenterology and Hepatology, Department of Chronic Diseases and Metabolism, University Hospitals Leuven, KU Leuven, Leuven, Belgium
| | - Jurij Hanzel
- Department of Gastroenterology, UMC Ljubljana, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Mark Löwenberg
- Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Amsterdam, The Netherlands
| | - Marc Ferrante
- Department of Gastroenterology and Hepatology, Department of Chronic Diseases and Metabolism, University Hospitals Leuven, KU Leuven, Leuven, Belgium
| | - Peter Bossuyt
- Imelda Clinical Research Centre, Imelda General Hospital, Bonheiden, Belgium
| | - Frank Hoentjen
- Department of Gastroenterology, Radboud University Medical Centre, Nijmegen, The Netherlands
- Division of Gastroenterology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | | | - Károly Palatka
- Division of Gastroenterology, Department of Internal Medicine, University of Debrecen, Debrecen, Hungary
| | - Harald Peeters
- Department of Gastroenterology, AZ Sint Lucas, Gent, Belgium
| | - Aart Mookhoek
- Institute of Tissue Medicine and Pathology, Bern University, Bern, Switzerland
| | - Gert de Hertogh
- Department of Pathology, University Hospitals Leuven, Leuven, Belgium
| | - Tamás Molnár
- Division of Gastroenterology, Department of Medicine, Albert Szent-Györgyi Medical School, University of Szeged, Szeged, Hungary
| | - Wouter van Moerkercke
- Department of Gastroenterology and Hepatology, Department of Chronic Diseases and Metabolism, University Hospitals Leuven, KU Leuven, Leuven, Belgium
- Department of Gastroenterology, AZ Groeninge, Kortrijk, Belgium
| | - Triana Lobatón
- Department of Gastroenterology and Hepatology, University Hospital Gent, Gent, Belgium
- Department of Internal Medicine and Pediatrics, Gent University, Gent, Belgium
| | - Esmé Clasquin
- Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Amsterdam, The Netherlands
| | - Melanie S Hulshoff
- Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Amsterdam, The Netherlands
| | - Filip Baert
- Department of Gastroenterology, AZ Delta, Roeselare, Belgium
| | - Geert D'Haens
- Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Amsterdam, The Netherlands
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4
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Nardone OM, Bazarova A, Bhandari P, Cannatelli R, Daperno M, Ferraz J, Goetz M, Gui X, Hayee B, De Hertogh G, Lazarev M, Li J, Parra-Blanco A, Pastorelli L, Panaccione R, Occhipinti V, Rath T, Smith SCL, Shivaji UN, Tontini GE, Vieth M, Villanacci V, Zardo D, Bisschops R, Kiesslich R, Ghosh S, Iacucci M. Endoscopic remission assessed with PICaSSO virtual electronic chromendoscopy accurately predicts clinical outcomes in ulcerative colitis. United European Gastroenterol J 2022; 10:147-159. [PMID: 35194978 PMCID: PMC8911539 DOI: 10.1002/ueg2.12185] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 11/11/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND AND AIMS A composite endoscopic-histologic remission is increasingly explored as an important endpoint in ulcerative colitis (UC). We investigated combined endoscopic-histologic remission for predicting clinical outcomes at 12 months compared with endoscopic remission alone using the high definition virtual chromoendoscopy (VCE) Paddington International virtual ChromoendoScopy ScOre (PICaSSO) and histology scores. METHODS Ulcerative colitis patients, prospectively enrolled from 11 international centres, underwent VCE with targeted biopsies and followed up for 12 months. Endoscopic activity was assessed by Mayo Endoscopic Score (MES), Ulcerative Colitis Endoscopic Index Severity (UCEIS) followed by VCE-PICaSSO. Robarts Histopathological Index|Robarts Histological index≤3 without neutrophils in mucosa, and Nancy Histological index (NHI)≤ 1 were used to define histologic remission. Combined endoscopic-histologic remission was compared with endoscopic remission alone by Cox proportional hazards model and by two- and three-proportion analysis using pre-specified clinical outcomes. RESULTS 307 patients were recruited and 302 analysed. There was no difference in survival without specified clinical outcomes between PICaSSO defined endoscopic remission alone and endoscopic plus histologic remission in the rectum (HR 0.42, 95%CI 0.16-1.11 and HR 1.03, 95%CI 0.42-2.52 for Robarts Histological index and NHI respectively) at 12 months. There was however a significant survival advantage without specified clinical outcome events for UCEIS combined with histology compared with UCEIS alone (HR 0.30, 95%CI 0.12-0.75, p = 0.02) at 12 months (but not combined with NHI). For MES there was no advantage for predicting specified clinical outcomes at 12 months for endoscopy alone versus endoscopy plus histology, but there were differences in two and three proportion analysis at 6 months. CONCLUSION Endoscopic remission by VCE-PICaSSO alone was similar to combined endoscopic and histologic remission for predicting specified clinical outcomes at 12 months. Larger studies with specific therapeutic interventions are required to further confirm the findings.
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Affiliation(s)
- Olga Maria Nardone
- Institute of Immunology & Immunotherapy, NIHR Wellcome Trust Clinical Research Facilities, University of Birmingham, UK and University Hospitals Birmingham NHS Trust, Birmingham, UK
| | - Alina Bazarova
- Institute of Immunology & Immunotherapy, NIHR Wellcome Trust Clinical Research Facilities, University of Birmingham, UK and University Hospitals Birmingham NHS Trust, Birmingham, UK.,Institute for Biological Physics, University of Cologne, Cologne, Germany
| | - Pradeep Bhandari
- Department of Gastroenterology, Queen Alexandra Hospital, Portsmouth, UK
| | - Rosanna Cannatelli
- Institute of Immunology & Immunotherapy, NIHR Wellcome Trust Clinical Research Facilities, University of Birmingham, UK and University Hospitals Birmingham NHS Trust, Birmingham, UK
| | - Marco Daperno
- Department of Gastroenterology, University of Torino, Torino, Italy
| | - Jose Ferraz
- Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada
| | - Martin Goetz
- Department of Gastroenterology, Klinikum Böblingen, Sindelfingen, Germany
| | - Xianyong Gui
- Department of Pathology, University of Washington, Seattle, Washington, USA
| | - Bu Hayee
- Department of Gastroenterology, Kings College London, London, UK
| | - Gert De Hertogh
- Department of Pathology, University Hospitals Leuven, Leuven, Belgium
| | - Mark Lazarev
- Department of Gastroenterology, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Ji Li
- Department of Gastroenterology, Peking Union Medical College Hospital, Dongcheng-qu, China
| | | | - Luca Pastorelli
- Department of Gastroenterology, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Remo Panaccione
- Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada
| | - Vincenzo Occhipinti
- Department of Gastroenterology, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Timo Rath
- Ludig Demling Endoscopy Center, University of Erlangen, Erlangen, Germany
| | - Samuel C L Smith
- Institute of Immunology & Immunotherapy, NIHR Wellcome Trust Clinical Research Facilities, University of Birmingham, UK and University Hospitals Birmingham NHS Trust, Birmingham, UK
| | - Uday N Shivaji
- Institute of Immunology & Immunotherapy, NIHR Wellcome Trust Clinical Research Facilities, University of Birmingham, UK and University Hospitals Birmingham NHS Trust, Birmingham, UK
| | - Gian Eugenio Tontini
- Department of Pathophysiology and Transplantation, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, University of Milan, Milano, Italy
| | - Michael Vieth
- Institute for Pathology, Klinikum Bayreuth, Bayreuth, Germany
| | | | - Davide Zardo
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Raf Bisschops
- Department of Pathology, University Hospitals Leuven, Leuven, Belgium
| | - Ralf Kiesslich
- Department of Gastroenterology, Helios HSK Wiesbaden, Wiesbaden, Germany
| | - Subrata Ghosh
- Institute of Immunology & Immunotherapy, NIHR Wellcome Trust Clinical Research Facilities, University of Birmingham, UK and University Hospitals Birmingham NHS Trust, Birmingham, UK.,College of Medicine and Health and APC Microbiome Ireland, University College Cork, Cork, Ireland.,National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Birmingham, UK
| | - Marietta Iacucci
- Institute of Immunology & Immunotherapy, NIHR Wellcome Trust Clinical Research Facilities, University of Birmingham, UK and University Hospitals Birmingham NHS Trust, Birmingham, UK.,Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada.,National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Birmingham, UK
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5
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Ma C, Sedano R, Almradi A, Vande Casteele N, Parker CE, Guizzetti L, Schaeffer DF, Riddell RH, Pai RK, Battat R, Sands BE, Rosty C, Dubinsky MC, Rieder F, Harpaz N, Abreu MT, Bryant RV, Lauwers GY, Kirsch R, Valasek MA, Crowley E, Sandborn WJ, Feagan BG, Pai RK, Jairath V. An International Consensus to Standardize Integration of Histopathology in Ulcerative Colitis Clinical Trials. Gastroenterology 2021; 160:2291-2302. [PMID: 33610533 PMCID: PMC8851891 DOI: 10.1053/j.gastro.2021.02.035] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 01/31/2021] [Accepted: 02/09/2021] [Indexed: 12/17/2022]
Abstract
BACKGROUND & AIMS Histopathology is an emerging treatment target in ulcerative colitis (UC) clinical trials. Our aim was to provide guidance on standardizing biopsy collection protocols, identifying optimal evaluative indices, and defining thresholds for histologic response and remission after treatment. METHODS An international, interdisciplinary expert panel of 19 gastroenterologists and gastrointestinal pathologists was assembled. A modified RAND/University of California, Los Angeles appropriateness methodology was used to address relevant issues. A total of 138 statements were derived from a systematic review of the literature and expert opinion. Each statement was anonymously rated as appropriate, uncertain, or inappropriate using a 9-point scale. Survey results were reviewed and discussed before a second round of voting. RESULTS Histologic measurements collected using a uniform biopsy strategy are important for assessing disease activity and determining therapeutic efficacy in UC clinical trials. Multiple biopsy strategies were deemed acceptable, including segmental biopsies collected according to the endoscopic appearance. Biopsies should be scored for architectural change, lamina propria chronic inflammation, basal plasmacytosis, lamina propria and epithelial neutrophils, epithelial damage, and erosions/ulcerations. The Geboes score, Robarts Histopathology Index, and Nancy Index were considered appropriate for assessing histologic activity; use of the modified Riley score and Harpaz Index were uncertain. Histologic activity at baseline should be required for enrollment, recognizing this carries operational implications. Achievement of histologic improvement or remission was considered an appropriate and realistic therapeutic target. Current histologic indices require validation for pediatric populations. CONCLUSIONS These recommendations provide a framework for standardized implementation of histopathology in UC trials. Additional work is required to address operational considerations and areas of uncertainty.
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Affiliation(s)
- Christopher Ma
- Division of Gastroenterology and Hepatology, Departments of Medicine and Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada; Alimentiv Inc (formerly Robarts Clinical Trials, Inc), London, Ontario, Canada.
| | - Rocio Sedano
- Department of Medicine, Division of Gastroenterology, Western University, London, Ontario, Canada
| | - Ahmed Almradi
- Department of Medicine, Division of Gastroenterology, Western University, London, Ontario, Canada
| | - Niels Vande Casteele
- Alimentiv Inc. (formerly Robarts Clinical Trials, Inc.), London, Ontario, Canada,Division of Gastroenterology, University of California San Diego, La Jolla, California, United States
| | - Claire E. Parker
- Alimentiv Inc. (formerly Robarts Clinical Trials, Inc.), London, Ontario, Canada
| | - Leonardo Guizzetti
- Alimentiv Inc. (formerly Robarts Clinical Trials, Inc.), London, Ontario, Canada
| | - David F. Schaeffer
- Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Robert H. Riddell
- Department of Laboratory Medicine & Pathobiology, Mount Sinai Hospital, Lunenfeld-Tanenbaum Research Institute, University of Toronto, Toronto, Ontario, Canada
| | - Reetesh K. Pai
- Division of Anatomic Pathology, Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Robert Battat
- Jill Roberts Center for IBD, Division of Gastroenterology and Hepatology, Weill Cornell Medicine, New York, New York, United States
| | - Bruce E. Sands
- Department of Medicine, The Dr. Henry D. Janowitz Division of Gastroenterology, Icahn School of Medicine at Mount Sinai Hospital, New York, New York, United States
| | - Christophe Rosty
- Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia,Envoi Pathology, Brisbane, Queensland, Australia
| | - Marla C. Dubinsky
- Department of Pediatrics, Division of Pediatric Gastroenterology, Icahn School of Medicine at Mount Sinai Hospital, New York, New York, United States
| | - Florian Rieder
- Department of Gastroenterology, Hepatology and Nutrition, Digestive Diseases and Surgery Institute, Cleveland Clinic Foundation, Cleveland, Ohio, United States,Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio, United States
| | - Noam Harpaz
- Department of Medicine, The Dr. Henry D. Janowitz Division of Gastroenterology, Icahn School of Medicine at Mount Sinai Hospital, New York, New York, United States,Department of Pathology, Molecular and Cell-Based Medicine and Division of Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, New York, United States
| | - Maria T. Abreu
- Crohn's and Colitis Center, Division of Gastroenterology, Department of Medicine, University of Miami Leonard Miller School of Medicine, Miami, Florida, United States
| | - Robert V. Bryant
- IBD Service, Department of Gastroenterology, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia,Faculty of Health Sciences, School of Medicine, University of Adelaide, Adelaide, South Australia, Australia
| | - Gregory Y. Lauwers
- DH. Lee Moffitt Cancer Center & Research Institute, and University of South Florida, Tampa, Florida, United States
| | - Richard Kirsch
- Department of Laboratory Medicine & Pathobiology, Mount Sinai Hospital, Lunenfeld-Tanenbaum Research Institute, University of Toronto, Toronto, Ontario, Canada
| | - Mark A. Valasek
- Department of Pathology, University of California San Diego, La Jolla, California, United States
| | - Eileen Crowley
- Division of Pediatric Gastroenterology, Western University, Children’s Hospital, London Health Sciences Centre, London, Ontario, Canada
| | - William J. Sandborn
- Alimentiv Inc. (formerly Robarts Clinical Trials, Inc.), London, Ontario, Canada,Division of Gastroenterology, University of California San Diego, La Jolla, California, United States
| | - Brian G. Feagan
- Alimentiv Inc. (formerly Robarts Clinical Trials, Inc.), London, Ontario, Canada,Department of Medicine, Division of Gastroenterology, Western University, London, Ontario, Canada,Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
| | - Rish K. Pai
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Scottsdale, Arizona, United States
| | - Vipul Jairath
- Alimentiv Inc. (formerly Robarts Clinical Trials, Inc.), London, Ontario, Canada,Department of Medicine, Division of Gastroenterology, Western University, London, Ontario, Canada,Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
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