As the chair of the P-ECCO Committee, it is my pleasure to introduce the newly elected member of the Committee, Eileen Crowley, a paediatric gastroenterologist from London Health Sciences Centre in Ontario, Canada.

Eileen completed her medical degree and Higher Specialist Training with the Royal College of Physicians, Ireland. She then moved to the Hospital of SickKids in Toronto, where she completed a Pediatric Gastroenterology Fellowship and a sub-specialty IBD Fellowship. While in Toronto, she first-authored a seminal paper that was published in Gastroenterology in 2020, entitled: “Prevalence and Clinical Features of Inflammatory Bowel Diseases Associated With Monogenic Variants, Identified by Whole-Exome Sequencing in 1000 Children at a Single Center”. This work has served to better delineate the genetic phenotype of children with IBD, as well as optimising response to therapy in this age group.

The treatment of children with Inflammatory Bowel Disease (IBD) presents unique challenges, largely due to the complex nature of the disease, the limitations of existing therapies in children and the common off-label use of "newer" agents. Paediatric IBD requires careful management to control inflammation, promote growth and maintain a good quality of life. The treatment armamentarium for IBD in adults has expanded rapidly in the past several years, with the approval of new biologic and small-molecule agents for moderate-to-severe Ulcerative Colitis (UC) and Crohn’s Disease (CD) [1–3].  Currently, however, only infliximab and adalimumab are approved for use in children [4, 5]. The fact that all other biologics (vedolizumab, ustekinumab and risankizumab) and new small targeted molecules (tofacitinib, upadacitinib and ozanimod) commonly used in adults have not yet been approved for use in children has led to their widespread off-label use. The use of off-label biologics is often required because approximately 15%–20% of patients with IBD experience primary non-response to anti-TNF agents and another 30%–40% lose response over time [4, 5].

Emma Halmos © ECCO

Hannah Gordon © ECCO

Richard Hansen © ECCO

Diet in Inflammatory Bowel Disease has become a hot topic in recent years, pushed forward by advances in our understanding of the microbiome and the promise of nutrition as therapy, particularly in Crohn’s Disease. One of the most important questions in clinic (and yet the hardest to answer) remains “What can I eat?” or variations of the same. The reason this question is so difficult to answer is the enormous complexity in how diet overlays IBD and also the lack of high-quality scientific studies addressing this specific problem.

Iva Hojsak, who has recently joined the P-ECCO Committee, is a paediatric gastroenterologist and head of the Paediatric Department and deputy director of the Children's Hospital Zagreb, Croatia. Iva graduated from the Medical School of Zagreb, where she also received her PhD. She was subsequently elected as assistant professor at University of Zagreb Medical School and University of J.J. Strossmayer Medical School.

Seamus Hussey © ECCO

2023 has been another outstanding year of emerging Inflammatory Bowel Disease (IBD) treatments – in adults.  Children and young adults remain underserved by clinical trials of IBD therapies.  While this age demographic garners much sympathy, and accounts for one-quarter of all new diagnoses, children and young adults are disenfranchised from accessing cutting-edge drug trials by virtue of age alone. Paediatric patients are the almost perfect participants – having generally fewer comorbidities, shorter disease duration and seemingly better treatment responses than adults. The additional challenges posed by trials in this age group have, however, left a relatively barren landscape of industry-sponsored trials in their wake. What, then, are the ongoing challenges, and what have industry and our drug trial community done to level the therapeutic playing field?

Firas Rinawi © Firas Rinawi

Primary sclerosing cholangitis (PSC) is less common in paediatrics than in adults, affecting 0.2–1.5 per 100,000 children (~20% the prevalence in adults). Those diagnosed in childhood are typically older than ten years, and there is a male predilection [1]. The aetiology of PSC is likely a multifactorial combination of an inherited predisposition, gut microbiome, gut–liver communication, bile homeostasis and downstream effects on the immune system which lead to biliary inflammation and fibrosis [2].

In the last decade, numerous biologics and small molecules have been tested in clinical trials for patients with Crohn’s Disease (CD), and some have already been approved and used effectively in such patients. However, there is increasing interest in the use of dietary therapies for patients with CD from both providers and patients, who often wish to start an intervention that is not associated with immunosuppression. In addition, studies in both animal models and humans have put the spotlight on different dietary components that can either provoke or suppress intestinal inflammation. As an example, specific emulsifiers that are widely used in the food industry as preservatives increase the susceptibility of mice to develop colitis [1] and also alter the faecal microbiome and metabolome in humans characterised by pro-inflammatory perturbations [2].

Richard Hansen © ECCO

The risk of thrombosis in paediatric IBD has become a hot topic in recent months, prompted by the publication of two impactful papers in Journal of Crohn’s and Colitis [1, 2]. Kuenzig and colleagues presented a large Canadian population-based study which described a vastly increased thrombosis rate in children with IBD compared to the normal population: the 5-year incidence was 31.2 per 10,000 person-years among children with IBD versus 0.8 per 10,000 person-years among children without IBD (95% confidence intervals 23.7–41.0 and 0.4–1.7, respectively) [1].

Dror Shouval © ECCO

Over the past two decades, significant progress has been made in the understanding of the role of genetics in the pathogenesis of Inflammatory Bowel Disease (IBD): On the one hand, adult IBD studies have identified more than 250 single nucleotide polymorphisms that increase the risk of disease, though their individual and overall effect on the risk of developing IBD is small [1]. On the other hand, the expanding use of next-generation sequencing (NGS) platforms has resulted in the identification of more than 100 different rare monogenic disorders that directly cause IBD [2]. Given the central role of immune cells in sustaining immune tolerance in the gut, it is not surprising that in many cases monogenic disorders causing IBD result from pathogenic variants in genes involved in essential immune or epithelial pathways. Some patients with such disorders present with a clear immunodeficiency phenotype (e.g. chronic granulomatous disease, Wiskott-Aldrich syndrome), but in others IBD is the sole manifestation [3].

As the new chair of the P-ECCO Committee, it is my pleasure to introduce two newly elected members of the Committee: Richard Hansen and Dror Shouval, two wonderful paediatric gastroenterologists from Scotland and Israel, respectively. Both are very active in the paediatric IBD field and they bring a wealth of expertise and energy to our group.