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Background & aims Pregnancy can be a complex and risk filled event for women with inflammatory bowel disease (IBD). High-quality studies in this population are lacking, with limited data on medications approved to treat IBD during pregnancy. For patients, limited knowledge surrounding pregnancy impacts pregnancy rates, medication adherence, and outcomes. Limited provider knowledge leads to highly varied practices in care affected by local dogma, available resources, individual interpretation of the literature, and fear of harming the fetus. The variations in guidelines by different societies and countries reflect this and lead to confusion for physicians and patients alike. The Global Consensus Consortium is a group of 39 IBD and content experts and 7 patient advocates from 6 continents who convened to review and assess current data and come to an agreement on best practices based on these data. Methods The GRADE process was used when sufficient published data were available and the RAND process in those instances where expert opinion was needed to guide consistent practice. Recommendations were informed by the guiding principle that maternal health best supports infant health. Results The topics were divided into ten categories with 34 GRADE recommendations and 35 Consensus statements. Conclusions Overall, the goal of the group was to provide data-driven and practical guidance to improve the care of women with IBD around the globe based on the best available research.

Abstract Background & Aims Pregnancy can be a complex and risk-filled event for women with inflammatory bowel disease (IBD). High-quality studies in this population are lacking, with limited data on medications approved to treat IBD during pregnancy. For patients, limited knowledge surrounding pregnancy impacts pregnancy rates, medication adherence, and outcomes. Limited provider knowledge leads to highly varied practices in care affected by local dogma, available resources, individual interpretation of the literature, and fear of harming the fetus. The variations in guidelines by different societies and countries reflect this and lead to confusion for physicians and patients alike. The Global Consensus Consortium is a group of 39 IBD and content experts and 7 patient advocates from 6 continents who convened to review and assess current data and come to an agreement on best practices based on these data. Methods The GRADE (Grading of Recommendations Assessment, Development, and Evaluation) process was used when sufficient published data were available and the RAND (Research and Development) process in those instances where expert opinion was needed to guide consistent practice. Recommendations were informed by the guiding principle that maternal health best supports infant health. Results The topics were divided into ten categories with 34 GRADE recommendations and 35 consensus statements. Conclusions Overall, the goal of the group was to provide data-driven and practical guidance to improve the care of women with IBD around the globe based on the best available research.

ABSTRACT Background & Aims Pregnancy can be a complex and risk filled event for women with inflammatory bowel disease (IBD). High‐quality studies in this population are lacking, with limited data on medications approved to treat IBD during pregnancy. For patients, limited knowledge surrounding pregnancy impacts pregnancy rates, medication adherence, and outcomes. Limited provider knowledge leads to highly varied practices in care affected by local dogma, available resources, individual interpretation of the literature, and fear of harming the fetus. The variations in guidelines by different societies and countries reflect this and lead to confusion for physicians and patients alike. The Global Consensus Consortium is a group of 39 IBD and content experts and 7 patient advocates from 6 continents who convened to review and assess current data and come to an agreement on best practices based on these data. Methods The GRADE (Grading of Recommendations Assessment, Development, and Evaluation) process was used when sufficient published data were available and the RAND process in those instances where expert opinion was needed to guide consistent practice. Recommendations were informed by the guiding principle that maternal health best supports infant health. Results The topics were divided into ten categories with 34 GRADE recommendations and 35 consensus statements. Conclusions Overall, the goal of the group was to provide data‐driven and practical guidance to improve the care of women with IBD around the globe based on the best available research.

Introduction: Pregnancy can be a complex and risk filled event for women with inflammatory bowel disease (IBD). High-quality studies in this population are lacking, with limited data on medications approved to treat IBD during pregnancy. For patients, limited knowledge surrounding pregnancy impacts pregnancy rates, medication adherence, and outcomes. Limited provider knowledge leads to highly varied practices in care affected by local dogma, available resources, individual interpretation of the literature, and fear of harming the fetus. The variations in guidelines by different societies and countries reflect this and lead to confusion for physicians and patients alike. The Global Consensus Consortium is a group of 39 IBD and content experts and 7 patient advocates from 6 continents who convened to review and assess current data and come to an agreement on best practices based on these data. Methods: The GRADE process was used when sufficient published data were available and the RAND process in those instances where expert opinion was needed to guide consistent practice. Recommendations were informed by the guiding principle that maternal health best supports infant health. Results: The topics were divided into 10 categories with 34 GRADE recommendations and 35 Consensus statements. Discussion: Overall, the goal of the group was to provide data-driven and practical guidance to improve the care of women with IBD around the globe based on the best available research.

Abstract Background & Aims Pregnancy can be a complex and risk-filled event for women with inflammatory bowel disease (IBD). High-quality studies in this population are lacking, with limited data on medications approved to treat IBD during pregnancy. For patients, limited knowledge surrounding pregnancy impacts pregnancy rates, medication adherence, and outcomes. Limited provider knowledge leads to highly varied practices in care affected by local dogma, available resources, individual interpretation of the literature, and fear of harming the fetus. The variations in guidelines by different societies and countries reflect this and lead to confusion for physicians and patients alike. The Global Consensus Consortium is a group of 39 IBD and content experts and 7 patient advocates from 6 continents who convened to review and assess current data and come to an agreement on best practices based on these data. Methods The GRADE (Grading of Recommendations Assessment, Development, and Evaluation) process was used when sufficient published data were available and the RAND (Research and Development) process in those instances where expert opinion was needed to guide consistent practice. Recommendations were informed by the guiding principle that maternal health best supports infant health. Results The topics were divided into ten categories with 34 GRADE recommendations and 35 consensus statements. Conclusions Overall, the goal of the group was to provide data-driven and practical guidance to improve the care of women with IBD around the globe based on the best available research.

Background: Etrasimod is an oral, once-daily (QD), selective sphingosine 1-phosphate (S1P)1,4,5 receptor modulator for the treatment of moderately to severely active ulcerative colitis (UC). It is known that non-serious treatment-emergent adverse events (TEAEs) may not lead to UC drug discontinuation but can affect treatment tolerability. Objectives: This post hoc analysis evaluated the incidence of specific, common, non-serious TEAEs reported in the etrasimod UC clinical programme and the characteristics of affected patients. Design: Data included patients from the Placebo-controlled UC cohort (phase II OASIS, and phase III ELEVATE UC 52 and ELEVATE UC 12 trials) receiving QD etrasimod (2 or 1 mg) or placebo. Methods: Proportions and incidence rates (IRs; the number of patients with a TEAE divided by the total exposure in patient-years (PYs), per 100 PY) of Headache, Pyrexia, Nausea and Dizziness TEAEs were reported. Changes in heart rate among patients with Dizziness TEAEs were also evaluated. Results: Among 943 patients (etrasimod 2 mg, N = 577 (276.7 PY); etrasimod 1 mg, N = 52 (11.4 PY); placebo, N = 314 (115.1 PY)), 48, 34, 27 and 21 patients experienced events of Headache, Pyrexia, Nausea and Dizziness, respectively. All events were non-serious; one patient treated with etrasimod was discontinued due to a Pyrexia TEAE. Numerically, IRs of Headache and Dizziness TEAEs were higher, and Nausea slightly higher, with etrasimod versus placebo (13.45 vs 8.63 per 100 PY, 6.52 vs 1.69 and 7.18 vs 5.13 per 100 PY, respectively); IRs were similar for Pyrexia. The duration of most TEAEs was 1–10 days. Conclusion: In the etrasimod UC clinical programme, all Headache, Pyrexia, Nausea and Dizziness events were non-serious. Headache and Dizziness were more frequent, and Nausea slightly more frequent, among patients receiving etrasimod versus placebo. The post hoc nature of this analysis is a limitation. These results reiterate the favourable safety profile and tolerability of etrasimod. Trial registration: ClinicalTrials.gov: NCT02447302; NCT03945188; NCT03996369.

Abstract Background Etrasimod is an oral, once-daily, selective sphingosine 1-phosphate (S1P)1,4,5 receptor modulator for the treatment of moderately to severely active ulcerative colitis (UC). Adverse events (AEs) pertaining to tolerability, laboratory and serious AEs are described elsewhere1,2; we present a post hoc analysis of the incidence, onset and duration of the most commonly occurring non-serious AEs in the etrasimod UC clinical programme. Methods Data from the pooled Placebo-controlled UC cohort, derived from the phase 2 OASIS (NCT02447302) and phase 3 ELEVATE UC 52 (NCT03945188) and ELEVATE UC 12 (NCT03996369) double-blind clinical trials, were included. Cohorts comprised OASIS and ELEVATE UC 12 12-week induction periods alongside the ELEVATE UC 52 12-week induction and 40-week maintenance periods utilising a "treat-through" design. Patients (pts) with moderately to severely active UC were eligible for the etrasimod UC clinical programme. Pts were randomised to etrasimod 1 mg once daily (QD; OASIS only), etrasimod 2 mg QD or placebo. Proportions and incidence rates (IRs) of non-serious AEs (MedDRA v24.1 Preferred Terms of headache, pyrexia, nausea, fatigue and dizziness) were analysed in the Placebo-controlled UC cohort. Results Among 943 pts (any dose of etrasimod, N=629 [288.1 pt years (PY)]; placebo, N=314 [115.1 PY]), there were 77, 36, 30, 15 and 23 headache, pyrexia, nausea, fatigue and dizziness AEs, respectively. All were non-serious and did not lead to treatment discontinuation, apart from one case of pyrexia in which early termination visits were incomplete. Proportions and IRs (per 100 PY) for headache and dizziness AEs were higher with etrasimod (any dose) vs placebo (IRs: 13.45 vs 8.63 and 6.52 vs 1.69, respectively); IRs for other non-serious AEs were similar in etrasimod (any dose) and placebo groups (Table). Onset of AEs varied over time and most AEs were short in duration (Figure shows onset and duration for headache and dizziness AEs). Most AEs were deemed not related to study treatment by the site investigator. Pts with dizziness on Days 1–3 had similar changes in heart rate vs those with dizziness after Day 3. No consistent trend in heart rate was observed in pts receiving etrasimod with early dizziness. Conclusion Among pts in the etrasimod UC clinical programme, all headache, pyrexia, nausea, fatigue and dizziness events were non-serious. IRs were similar for most non-serious AEs across treatment groups, excluding headache and dizziness. Most non-serious AEs were short in duration and judged as not related to study treatment, suggesting they may not impact on the overall tolerability of etrasimod. References 1. Sandborn WJ et al. Gastroenterology 2020; 158: 550–61. 2. Sandborn WJ et al. Lancet 2023; 401: 1159–71.

Abstract Background Crohn’s disease (CD) is a heterogenous, chronic inflammatory disorder driven by a combination of genetic, environmental, and microbiota-dependent risk factors. Mononuclear phagocytes (MNP) are crucial cells that maintain intestinal homeostasis. An important cytokine for MNP survival and function is granulocyte-macrophage colony stimulating factor (GM-CSF). Interestingly, several studies reported CD-associated genetic risk variants within the GM-CSF receptor and its downstream signaling components. Furthermore, high titers of autoantibodies specific to GM-CSF can be detected in CD patients. Taken together, this data suggests an important role for GM-CSF in abrogation of CD development in a subgroup of patients. Aims This study sought to investigate the function of GM-CSF autoantibodies in CD. Methods We retrospectively quantified and characterized GM-CSF autoantibodies in sera of 220 CD, 200 ulcerative colitis (UC) patients, and 220 healthy controls (HC) sampled at 3 time points prior to disease diagnosis and one time point after diagnosis. ELISA was used to determine GM-CSF autoantibody titers and isotypes followed by in vitro multiplexed mass cytometry (CyTOF) neutralization assays on peripheral blood mononuclear cells. Flow cytometry and CyTOF were used to map the profile of immune cells isolated from inflamed and non-inflamed CD mucosa. Results Our data demonstrates that GM-CSF autoantibodies are specific to CD, significantly elevated up to 7 years prior to diagnosis of disease, and correlate with disease location, severity, and complications at the time of diagnosis. Moreover, in contrast to GM-CSF autoantibodies in pulmonary alveolar proteinosis patients, CD-associated autoantibodies neutralize GM-CSF via specific recognition of post-translational modifications (PTM), affecting MNP function. Removal of PTM enabled GM-CSF to escape autoantibody binding and restored MNP response to GM-CSF in the presence of neutralizing antibodies, indicating a potential therapeutic avenue. Furthermore, we identified group 3 innate lymphoid cells (ILC3) as a major source of GM-CSF in the healthy intestinal tract, suggesting intriguing crosstalk of MNP and ILC3 across the GM-CSF-GM-CSFR axis. Conclusions Our results identify GM-CSF autoantibodies as predictive serological biomarker for CD in a subgroup of patients presenting with severe and complicated form of disease at the time of diagnosis. The presence of GM-CSF autoantibodies precedes the onset of CD by several years and likely abrogates homeostatic immune cell crosstalk involving ILC3 and MNP, suggesting the development of a pre-diseased state in CD patients. Funding Agencies CIHRDr. Edward Ketchum Graduate Scholarship

Summary Background Patients with Crohn's disease ( CD ) have serologic responses to various microbial antigens. Serologic markers are associated with aggressive forms of disease and can be detected before onset of symptoms. Their utility in pre‐clinical disease or prediction of complicated disease course before diagnosis is unclear. Aim To evaluate the pattern of serologic anti‐microbial antibodies long prior to diagnosis and the subsequent risk of complicated Crohn's disease at diagnosis. Methods Sera from 100 US military personnel with Crohn's disease were obtained from the Department of Defense Serum Repository. For each patient, four samples were obtained at different time points before and around diagnosis, and were tested for 6 microbiota‐directed antibodies ( ASCA ‐IgA, ASCA ‐IgG, anti‐OmpC, anti‐ CB ir1, anti‐A4‐Fla2 and anti‐FlaX). Associations between the presence and accumulation of Crohn's disease anti‐microbial antibodies before diagnosis and with the later development of complications were evaluated. Results Overall, 65 patients were positive for at least one Crohn's disease associated anti‐microbial antibody in the earliest available sample, at a median of 6 years before Crohn's disease diagnosis (interquartile range, 5.6–8.2). The number of positive anti‐microbial antibodies increased up to the time of Crohn's disease diagnosis. Complicated disease developed around the time of diagnosis in 24 patients. The proportion of positive antimicrobial antibodies before diagnosis was higher in patients with complicated vs. noncomplicated Crohn's disease. There was an inverse relationship between the time to first complication and the magnitude of serologic response before diagnosis. Conclusion The presence and accumulation of circulating anti‐microbial antibodies years before Crohn's disease diagnosis was associated with complicated Crohn's disease at or shortly after diagnosis.