Background The safety of ustekinumab in pregnant patients with inflammatory bowel disease (IBD) and in their offspring has been barely studied. Aims Primary: To know the risk of serious adverse events (SAEs) in women exposed to ustekinumab during pregnancy and in their offspring. Secondary: To assess the risk of complications of the mothers and their offspring. To describe the patterns of use of ustekinumab during pregnancy in these patients Methods Patients with IBD exposed to ustekinumab during pregnancy from DUMBO registry of GETECCU were included. DUMBO is a prospective, observational and multicentre registry, which enrols pregnant women with IBD over 5 years in 70 centres in Spain. The registry was kicked off in September 2019. SAE definition was based on “Clinical Safety Data Management: Definitions and Standards for Expedited Reporting by European Medicines Agency”. Study protocol is summarized in figure 1. Results 49 pregnant patients have been exposed to ustekinumab during pregnancy so far (table 1). All pregnancies were singleton. Two patients were lost of follow-up (1st and 2nd trimester) but had uneventful pregnancies up-to last visit. There were 2 miscarriages (4%) at 1st trimester of gestation, 34 newborns and 11 pregnancies that were still on-going at the time of this analysis. All patients were on ustekinumab at conception (57% of them 90 mg/8 weeks). A total of 12 patients (24%) withdrawn ustekinumab during pregnancy: 1 (8%) due to disease flare, 1 (8%) underwent surgery due to intestinal obstruction, 2 (17%) due to patient’s choice (at 1st and 2nd trimester), and 8 (67%) due to clinicians’ decision (1 at 1st, 5 at 2nd and 2 at 3rd trimesters). No patient flared up after ustekinumab discontinuation. 10 (20%) patients had SAEs: 2 miscarriages, 1 intestinal infection, 1 subcorionic hematoma, 3 preterm birth, 1 intestinal obstruction and perforation (underwent surgery), 1 preeclapmsia, and 1 stoma obstruction. A total of 34 women gave birth after a median of 39 weeks gestation [interquartile range (IQR)=38–40], 3 (9%) preterm births, 55% by caesarean section (82% obstetric reasons and 18% perianal fistulae). Of the 34 newborns, 53% were female, median birth weight was 3,110 g (IQR=2,820–3,325), 3 (9%) low-birth weight, and 50% were breastfed exclusively. Median babies’ follow-up was 12 months (IQR=7–16). During follow-up, 3 children (9%) had severe infections (2 urinary infections, and 1 bronchiolitis by respiratory syncytial virus). In addition, 4 (13%) children were hospitalized: 1 cardiorespiratory arrest, 1 prematurity, 1 jaundice, and 1 vesicoureteral reflux Conclusion Ustekinumab seems to be safe during pregnancy in patients with IBD and their offspring.

Background Prospective registries are necessary to evaluate the safety of inflammatory bowel disease (IBD) treatment during pregnancy and in children in the long term. Aims The overall aim of DUMBO registry is to know the risk of serious adverse events (SAEs) during pregnancy and in children up to 4 years of age exposed during pregnancy to drugs for IBD (mainly focused on biologics), compared to unexposed children. In this analysis we aim to evaluate the risk of SAEs during pregnancy and the predictive factors of it (mainly focused on IBD drugs). Methods Prospective, observational and multicentre registry, which enrols pregnant women with IBD (Crohn’s disease, ulcerative colitis, IBD-unclassified) over 5 years in 70 centres in Spain. The registry was kicked off in September 2019. SAE was defined based on “Clinical Safety Data Management: Definitions and Standards for Expedited Reporting by European Medicines Agency”. Study protocol is summarized in figure 1. Results 433 women have been included so far; 241 got pregnant at least 9 months before this interim analysis (table 1). Mean age was 34 years, and 17% of women had active disease at any time during pregnancy. 23% of pregnancies were exposed to immumodulators (thiopurines), 25% to biologics and 10% to combo therapy (biologics and immunomodulators). 85 pregnancies (35%) were exposed to biologics (60 anti-TNF, 17 ustekinumab, and 8 vedolizumab) either in combo or in monotherapy. There were 237 newborns (227 singleton and 5 pair of twins), 9 miscarriages and 1 abortion. 72% of patients had vaginal delivery and 28% C-sections (18% due to perianal CD or active disease). A total of 59 pregnancies (24.5%) reported at least one SAE: 32% in exposed to biologics and 20.5% in non-exposed group (p>0.05) (figure 2). Four out of 17 pregnancies exposed to ustekinumab and 3 out of 8 exposed to vedolizumab had SAEs (non-related with the drug). In the multivariate analysis, adjusted by disease activity, in comparison with no immunosuppressive treatment, neither immunosuppressants [Odds ratio (OR)=1.1, 95% confidence interval (CI)=0.3–4.3] nor biologics in monotherapy or in combo (OR=0.8; 95%CI=0.2–3) were associated with higher risk of SAEs. 40 patients (17%) were hospitalised due to complications during pregnancy or delivery (figure 3). Two patients underwent surgery during pregnancy due to IBD complications Conclusion IBD treatment (either immunomodulators or biologics) does not increase the risk of SAEs during pregnancy. Nevertheless, one-quarter of IBD women suffer SAEs during pregnancy and about 20% need hospitalisation, which should be taken into account when managing IBD during pregnancy.

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