Very Early Onset Inflammatory Bowel Disease Research Articles

Very Early Onset-IBD: evidence for the need of a multidisciplinary approach.

SummaryVery early onset inflammatory bowel disease (VEO-IBD) represents approximately 25% of cases of IBD-like colitis occurring during childhood and, by definition, it is characterized by an onset prior to 6 years of age. This subgroup of patients presents significant differences from IBD occurring in older children and in adults, including a more severe clinical course, a reduced responsiveness to conventional IBD therapy, and a greater proportion of cases featuring an underlying monogenic disorder. Histological findings from gastro-intestinal (GI) biopsies are characterized by an IBD-like, apoptotic or enterocolitis-like pattern, complicating the differential diagnosis with other pediatric diseases involving GI tract. Moreover, individuals with monogenic disorders may develop significant comorbidities, such as primary immunodeficiency (PID), impacting treatment options. Without an appropriate diagnosis, the clinical course of VEO-IBD has greater potential for escalated treatment regimens involving extensive surgery, more intensive medical therapies and, even more important, inadequate recognition of underlying monogenic defect that may lead to inappropriate (sometimes fatal) therapy. For these reasons, an adequate context leading to an appropriate diagnosis is imperative, calling for a close collaboration between pediatricians, pathologists, geneticists, and immunologists.

P263 Very early onset Inflammatory Bowel Diseases: Review of the Genoa-Messina joint clinical experience. Clinical history: Part I

Abstract Background Pediatric inflammatory bowel diseases (pIBD) have specific phenotypes compared to Inflammatory Bowel Diseases (IBD) in adults. The Very Early Onset-IBD (VEO-IBD) is considered a diagnosis of IBD in children before age 6 years old with 15% of prevalence. Methods The objective of this study was to compare the clinical and endoscopic features of VEO-IBD compared to pediatric IBD (diagnosis > 6 years old) also in terms of natural history and response to treatment. The VEO patients followed at the IBD-Centers of Messina and Gaslini were enrolled retrospectively. We compared the results of this population with what is reported in the literature in terms of clinical characteristics at onset (symptoms, age at onset, age at diagnosis), comorbidities, complications, associated immunodeficiencies, endoscopic models. Percentage comparison and chi-square test of data was performed. Results 74 VEO-IBD patients were enrolled. The onset is around 3 years, a predominantly colonic localization, inflammatory pattern. Positive family history for IBD in 8.1%. Histology is very nonspecific and is characterized above all by basal plasmacytosis (CD 68,4%; CU 72,7%) and hypereosinophilia (CD 36,8%; CU 40%). At diagnosis, IBD-U (= Unclassified) is prevalent (47,2%), the frequency of which will decrease over the years (3 years after onset, 32.4%), differentiating into CU and CD (table 1). The main clinical manifestations at onset are chronic diarrhea (CD 89,5%; CU 91%), blood in the stool and / or hematochezia (CD 78,9%; CU 96,4%; table 2). Sensitive onset tests for IBD are ESR, fecal calprotectin and iron deficiency anemia (positive respectively in CD 75-60-71,4%%; CU 58,8-84,6-66,7%). The most frequent extraintestinal manifestations are arthritis (CD 22,2%) and sclerosing cholangitis (CU 7,3%). To highlight the significant statistical association (p <0.05) between VEO-IBD and neuro / nephrological diseases (major renal malformations and nephropathies, autism and neuropsychiatric disorders; table 3). Among the most common complications are severe anemia (CD 31,6%; CU 42,6%), acute attack of severe colitis, malnutrition and fistulization. A monogenic form of VEO-IBD was found in 5.4% frequently linked to immunedeficiency, 2 cases required allogenic HSC transplantation (XIAP, WAS). Conclusion VEO-IBDs represent a challenge for the pediatric gastroenterologist. The clinical course is no more severe than pediatric inflammatory bowel diseases, with the exception of monogenic forms. A genetic association between nephro / neurological comorbidities and VEO-IBDs is likely, the genetics is still to be discovered. Further studies will be needed to define the best therapeutic and diagnostic approach for these diseases.

P300 Very early onset Inflammatory Bowel Diseases: Review of the Genoa-Messina joint clinical experience. Therapeutic approach: Part II

Abstract Background Pediatric inflammatory bowel diseases (pIBD) have specific phenotypes compared to Inflammatory Bowel Diseases (IBD) in adults. The Very Early Onset-IBD (VEO-IBD) is considered a diagnosis of IBD in children before age, 6 years old with, 15% of prevalence. Methods The objective of this study was to compare the clinical and endoscopic features of VEO-IBD compared to pediatric IBD (diagnosis >, 6 years old) also in terms of natural history and response to treatment. The VEO patients followed at the IBD-Centers of Messina and Gaslini were enrolled retrospectively. We compared the results of this population with what is reported in the literature in terms of therapeutic approach and surgery. Percentage comparison of data was performed. Results 74 VEO-IBD patients were enrolled. At the onset of the disease, during induction therapy, we found, 15–21% of VEO-IBDs are corticoresistant, remission was with Infliximab (table 1). During disease follow-up of at least, 5 years from onset: CD, 47,4% and CU, 61,1% of VEO-IBDs remain in therapeutic maintenance with, 1st line drugs (Mesalazine and Azathioprine; table 2). This result highlights how the VEO-IBDs also maintain clinical, histological and endoscopic remission even with, 1st line drugs, the only exception being the monogenic forms that may also require HSC transplantation. The surgical approach, according to our data, is far superior to that reported in the literature, although there are several conflicting studies in this regard. Patients undergoing major surgery (colectomy, ileostomy, ileorectoanastomosis, J pouch) are CD, 36.8% and CU, 18.5%, if we also consider minor surgery (perianal surgery; CD, 36.8%) the percentage of patients with Crohn’s disease undergoing surgery increases to, 52.6%. These numbers are far above what is reported in the literature:, 14–15% after, 5 years from diagnosis. It is likely that this result is due to the high numbers of procedures performed at Gaslini Institute, National Center for these diseases. A monogenic form of VEO-IBD was found in, 5.4% frequently linked to immunedeficiency, 2 cases (2,7%) required allogeneic HSC transplantation (XIAP, WAS) with complete recovery from disease. Conclusion VEO-IBDs represent a challenge for the pediatric gastroenterologist. Therapy is no different in terms of response from pediatric inflammatory bowel diseases, with the exception of monogenic forms who may need HSC transplant. Many VEO IBDs maintain remission with, 1st line drugs. Further studies will be needed to define the best therapeutic and diagnostic approach for these diseases.

Diagnostic d’une maladie inflammatoire rare et sévère de l’intestin chez un nourrisson présentant des ulcérations péri-orificielles

We report the case of an infant aged 8 and a half months, who had an apparent life-threatening event and died despite optimal resuscitation management. The medical history was marked by mild symptoms, mainly feeding difficulties and progressively settling skin lesions. Parents were related (first cousins) and the patient had two healthy older sisters. Autopsy showed growth delay, symmetrical erythematous and ulcerated periorificial lesions associated with punctiform erythematous lesions of the face and alopecia. Microscopic examination revealed deep bronchial inhalation with the onset of infectious pneumopathy, major inflammatory ulceration of the gastrointestinal tract, hepatic steatosis, brain stem and pancreas abnormalities. We conclude that the cause of death was a multi-visceral failure with inhalation pneumopathy, in a context of very early onset inflammatory bowel disease (VEO-IBD). Genetic consultation, into a rare disease reference center, allowed to orient the analysis, to identify a homozygous pathogenic variant in the IL10RA gene, confirming the diagnostic of an autosomal recessive very early onset inflammatory bowel disease (inflammatory bowel disease 28, early-onset, autosomal recessive, #613148).

Autosomal recessive 333 base pair interleukin 10 receptor alpha subunit deletion in very early-onset inflammatory bowel disease.

BACKGROUNDInterleukin 10 receptor alpha subunit (IL10RA) dysfunction is the main cause of very early-onset inflammatory bowel disease (VEO-IBD) in East Asians.AIMTo identify disease-causing gene mutations in four patients with VEO-IBD and verify functional changes related to the disease-causing mutations.METHODSFrom May 2016 to September 2020, four young patients with clinically diagnosed VEO-IBD were recruited. Before hospitalization, using targeted gene panel sequencing and trio-whole-exome sequencing (WES), three patients were found to harbor a IL10RA mutation (c.301C>T, p.R101W in one patient; c.537G>A, p.T179T in two patients), but WES results of the fourth patient were not conclusive. We performed whole-genome sequencing (WGS) on patients A and B and reanalyzed the data from patients C and D. Peripheral blood mononuclear cells (PBMCs) from patient D were isolated and stimulated with lipopolysaccharide (LPS), interleukin 10 (IL-10), and LPS + IL-10. Serum IL-10 levels in four patients and tumor necrosis factor-α (TNF-α) in the cell supernatant were determined by enzyme-linked immunosorbent assay. Phosphorylation of signal transducer and activator of transcription 3 (STAT3) at Tyr705 and Ser727 in PBMCs was determined by western blot analysis. RESULTSThe four children in our study consisted of two males and two females. The age at disease onset ranged from 18 d to 9 mo. After hospitalization, a novel 333-bp deletion encompassing exon 1 of IL10RA was found in patients A and B using WGS and was found in patients C and D after reanalysis of their WES data. Patient D was homozygous for the 333 bp deletion. All four patients had elevated serum IL-10 levels. In vitro, IL-10-stimulated PBMCs from patient D failed to induce STAT3 phosphorylation at Tyr705 and only minimally suppressed TNF-α production induced by LPS. Phosphorylation at Ser727 in PBMCs was not affected by LPS or LPS + IL-10 in both healthy subjects and in patient D.CONCLUSIONWGS revealed a novel 333-bp deletion of IL10RA in four patients with VEO-IBD, whereas the WES results were inconclusive.

A Pattern-based Pathology Approach to Very Early-onset Inflammatory Bowel Disease: Thinking Beyond Crohn Disease and Ulcerative Colitis.

Very early-onset inflammatory bowel disease (VEO-IBD), IBD diagnosed in children younger than 6 years old, is phenotypically and genetically distinct from older onset IBD. Monogenic and digenic causative defects, particularly in primary immunodeficiency and intestinal epithelial barrier genes, have been identified in a subset of patients with VEO-IBD allowing for targeted therapies and improved outcomes. However, these findings are the minority, thus strategies to correctly diagnose patients, including identification of specific histopathologic findings with correlating clinical and laboratory features may provide critical and necessary insight into mechanisms of disease pathogenesis and subsequent therapeutic options. In this article, we review the pathologic findings seen in patients with VEO-IBD and outline a pattern-based approach to diagnosis using examples from primary immunodeficiencies with gastrointestinal manifestations.

Inflammatory bowel diseases in Tamil Nadu: A survey of demographics, clinical profile, and practices.

BackgroundInflammatory bowel disease (IBD) is increasingly diagnosed in South Asia. This survey by the Tamil Nadu Chapter of the Indian Society of Gastroenterology (TNISG) documents the demography, clinical profile, and therapeutic practices related to IBD in Tamil Nadu.MethodsTNISG members from 32 institutions completed an online cross‐sectional questionnaire on IBD patients from March 2020 to January 2021.ResultsOf 1295 adult IBD patients, 654 had Crohn's disease (CD), 499 ulcerative colitis (UC), and 42 IBD‐unclassified (IBD‐U). CD and UC showed a unimodal age distribution. A total of 55% were graduates or postgraduates. A positive family history was noted in 30, other risk factors were uncommon. In CD, the pattern of involvement was ileocolonic (42.8%), ileal (34.7%), colonic (18.9%), and upper gastrointestinal (3.5%); while in UC, disease was characterized as extensive (44.9%), left‐sided (41.7%), or proctitis (13.4%). Perineal disease, perianal fistulae, and bowel obstruction were noted in 4.3, 14.0, and 23.5%, respectively, of CD. The most widely used drugs were mesalamine, azathioprine, and corticosteroids. Surgery was undertaken in 141 patients with CD and 23 patients with UC. Of the 138 patients with pediatric IBD (≤16 years), 23 were characterized as very early onset IBD (VEO‐IBD), 27 as early‐onset, and 88 as adolescent IBD. VEO‐IBD were more likely to have a positive family history of IBD and were more likely to have perineal disease and to have the IBD‐U phenotype. Among pediatric IBD patients, corticosteroids, mesalamine, and azathioprine were the most commonly used medications, while 25 pediatric patients received biologics.ConclusionThis study provides important information on demography, clinical profile, and treatment practices of IBD in India.

Pattern-based Histologic Approach in Very Early Onset IBD: Main Features and Differential Diagnosis.

Very early onset inflammatory bowel disease (VEO-IBD) is a clinical umbrella classification composed of IBD-like diseases encompassing both classic IBD (Crohn's disease and ulcerative colitis) and monogenic disorder, both arising before 6 years of age. VEO-IBD patients present significant clinical differences from IBD occurring in older children and in adults, including more severe disease, often unresponsive to conventional IBD therapy and a greater proportion of cases featuring an underlying genetic alteration. Histologic findings of gastrointestinal biopsies can show an IBD-like pattern (both Crohn's disease-like and ulcerative colitis-like pattern), an apoptotic-like and enterocolitis-like pattern. Findings of specific morphologic alterations, such as villous blunting, apoptosis, dense eosinophilic infiltrates, lack of plasma cells and severe glandular atrophy, can suggest a monogenic disorder. Moreover, individuals with monogenic disorders may develop significant problems such as primary immunodeficiency, impacting treatment options. Finally, IBD histology in childhood can differ from that in older patients and adults. This complexity makes a differential diagnosis between IBD and other pediatric diseases involving the gastrointestinal tract difficult, especially considering that histologic features can be similar between different diseases. Without an appropriate diagnosis, the clinical course of VEO-IBD has greater potential for escalated treatment regimens involving extensive surgery and more intensive medical therapies rather than specific therapy directed toward the underlying defect. For these reasons, a pattern-based histologic approach correlated with clinical and laboratory findings with a multidisciplinary approach is fundamental to reach a correct diagnosis in an adequate clinical context.

CTLA-4 Haploinsufficiency Presenting as Extensive Enteropathy in a Patient With Very Early Onset Inflammatory Bowel Disease

Patients with very early onset inflammatory bowel disease (VEO-IBD) have a higher incidence of monogenic disease compared to older age groups. Age, alone, is a strong predictor for monogenic disease. We discuss a case of VEO-IBD in which the patient presented with severe and refractory enteropathy, leading to diagnosis of CTLA-4 haploinsufficiency. Genetic workup showed de novo heterozygous deletions of the CTLA-4 and ICOS genes. This case was unique, as the patient did not have the other manifestations commonly present with the disease. We advocate for early and routine genetic workup of VEO-IBD, as patients with monogenic IBD have high morbidity and mortality, if inadequately treated. Our patient did not respond to conventional treatment modalities and required targeted treatment with Abatacept, a CTLA-4 agonist.

PediatricGlobal Health in Children with Very Early-Onset Inflammatory Bowel Disease.

Children with very early-onset inflammatory bowel disease (VEO-IBD) represent a distinct group of patients with IBD with unique phenotypic and genetic characteristics; however, they are frequently omitted from psychosocial research. This study used a novel, brief measure of pediatric global health to assess (1) overall health-related quality of life (HRQOL) in children with VEO-IBD, (2) HRQOL compared to healthy children, and (3) whether gastrointestinal symptoms account for the differences in HRQOL between these groups. Caregivers of 51 children with VEO-IBD (Mage = 4.26 years, 75% male) and 54 healthy children (Mage = 3.50 years, 54% male) completed the PROMIS Pediatric Global Health Scale (PGH-7) parent-proxy form to assess HRQOL and a questionnaire assessing gastrointestinal symptoms. Descriptive statistics, analysis of variance with covariates (ANCOVA), and meditation analyses with bootstrapping were conducted. Caregivers of children with VEO-IBD rated their HRQOL as relatively positive, although children with greater disease yielded lower ratings on some PGH-7 items (e.g., fun with friends, physical health, sadness). Compared to healthy youth, children with VEO-IBD scored lower on the PGH-7, with significantly lower item-level scores on overall health, physical health, mental health, and quality of life. Gastrointestinal symptoms mediated the association between health status (i.e., VEO-IBD vs. healthy) and HRQOL, αβ = -2.84, 95% CI = -5.70, -0.34. While some children with VEO-IBD are at risk for deficits in HRQOL, many are quite resilient. Psychosocial screening is necessary for providing appropriate referrals to behavioral health services and learning more about psychosocial adjustment in children with VEO-IBD.

Ruxolitinib: Targeted Approach for Treatment of Autoinflammatory Very Early Onset Inflammatory Bowel Disease

Very early onset inflammatory bowel disease (VEO-IBD), diagnosed <6 years old, can be genetically and phenotypically distinct and more refractory than older-onset IBD. Identified causal monogenic defects have been targeted therapeutically in a small subset of VEO-IBD1; however, for most of these children, treatment strategies, such as phenotypic profiles, are critically needed to improve outcomes.

Very early onset inflammatory bowel disease: Spectrum of clinical presentation, diagnostic tools and outcome in children.

To explore the spectrum of presentation, underlying monogenetic defects and outcome in very early onset inflammatory bowel disease (VEO-IBD). The prospective, observational study was conducted at the Children's Hospital, Lahore, Pakistan, from January 2017 to December 2018, and comprised children developing features of inflammatory bowel disease aged <6 years. Data included demography, clinical presentation, diagnostic tools and outcome. Data was analysed using SPSS 21. Of the 60 children with relevant symptoms, 26(43.3%) were diagnosed as having very early onset inflammatory bowel disease. Of them, 13(50%) had underlying monogenic defect, and 16(61.5%) had ulcerative colitis. There were 22(84.6%) males with median age of 1.5(11) months in monogenic inflammatory bowel disease versus 24(43) months for non-monogenic inflammatory bowel disease (p<0.05). In the monogenic group, isolated rectal bleeding was the major presentation 13(100%) versus non-monogenic who presented mainly with failure to thrive 13(100%). Upper and lower endoscopies with histopathology had good diagnostic yield and inflammatory infiltrates on the biopsied tissues were the major findings. Mutations detected among the subjects were XIAP, PRKDC, PIK3CD, RAG-1, LRBA, DOCK8, TTC7, MEFV and EPCAM. Mortality was significantly higher in the monogenic group 7(54%) than in the non-monogenic group 2(15%) (p<0.05). Very early onset inflammatory bowel disease should be suspected when conventional management fails to rectify common disease mimickers. Testing for underlying immunological defect and genetic mutation would be helpful for managing these rare disorders.

Duplication of the IL2RA locus causes excessive IL-2 signaling and may predispose to very early onset colitis

Single genetic mutations predispose to very early onset inflammatory bowel disease (VEO-IBD). Here, we identify a de novo duplication of the 10p15.1 chromosomal region, including the IL2RA locus, in a 2-year-old girl with treatment-resistant pancolitis that was brought into remission by colectomy. Strikingly, after colectomy while the patient was in clinical remission and without medication, the peripheral blood CD4:CD8 ratio was constitutively high and CD25 expression was increased on circulating effector memory, Foxp3+, and Foxp3neg CD4+ T cells compared to healthy controls. This high CD25 expression increased IL-2 signaling, potentiating CD4+ T-cell-derived IFNγ secretion after T-cell receptor (TCR) stimulation. Restoring CD25 expression using the JAK1/3-inhibitor tofacitinib controlled TCR-induced IFNγ secretion in vitro. As diseased colonic tissue, but not the unaffected duodenum, contained mainly CD4+ T cells with a prominent IFNγ-signature, we hypothesize that local microbial stimulation may have initiated colonic disease. Overall, we identify that duplication of the IL2RA locus can associate with VEO-IBD and suggest that increased IL-2 signaling predisposes to colonic intestinal inflammation.

Mucosal Invariant T cells are Diminished in Very Early-Onset Inflammatory Bowel Disease.

Very early-onset inflammatory bowel disease (VEO-IBD) arises in children less than 6 years old, a critical time for immunologic development and maturation of the intestinal microbiome. Non-conventional lymphocytes, defined here as mucosal-associated invariant T cells and innate lymphocytes, require microbial products for either development or expansion, aspects that could be altered in very early-onset inflammatory bowel disease. Our objective was to define conventional leukocyte and non-conventional lymphocyte populations in controls and patients using multiparameter flow cytometry to test the hypothesis that their frequencies would be altered in a chronic inflammatory state associated with significant dysbiosis. Multiparameter flow cytometry was used in a control cohort of 105 subjects to define age-effects, not previously comprehensively examined for these cell types in humans. Differences were defined between 263 unique age-matched patients with VEO-IBD and 105 controls using Student t-test. Subjects were divided into two age groups at the time of sampling to control for age-related changes in immune composition. Intermediate monocytes were consistently decreased in patients with VEO-IBD compared to controls. Mucosal-associated invariant T cells were significantly lower in patients with long-standing disease. Levels were less than half of those seen in the age-matched control cohort. The innate lymphoid cells type 2 population was expanded in the youngest patients. Mucosal-associated invariant T cells are diminished years after presentation with inflammatory bowel disease. This durable effect of early life intestinal inflammation may have long-term consequences. Diminished mucosal-associated invariant T cells could impact host defense of intestinal infections.

P501 Incidence and therapeutic management/treatment of very early onset inflammatory bowel disease during 2015–2020

Abstract Background To investigate the incidence of very early onset inflammatory bowel disease (VEO-IBD) in a cohort representing two regions in Denmark during the period 2015–2019 and to assess the medical and surgical treatment. Methods All patients diagnosed with VEO-IBD within The Capital Region and The Zealand Region from January 1, 2015 to July 1, 2020 were included. Demographic and clinical data and medical and surgical treatment were extracted from the files. Results Forty patients with VEO-IBD were identified. The incidence rate was 2.0/100,000 (CI 95% 0.8–5.9) during the 2015–2019. Totally 35 patients (87.5%) received immunomodulatory therapy during follow-up. The cumulative risk of receiving immunomodulatory therapy after 1 year, 3 years and 5 years was 58% (95% CI 39–71), 88% (95% CI 70–95) and 91% (95% CI 73–97) respectively. Totally 23 patients (57.5%) received biological therapy. The cumulative risk of receiving biological therapy after 1 year, 3 years and 5 years was 37% (95% CI 19–50), 46% (95% CI 27–60) and 57% (95% CI 36–71) respectively. Six patients (15%) received vedolizumab. Four patients (10%) with VEO-IBD underwent a colectomy during the follow-up period of which two patients received vedolizumab. Conclusion The incidence of VEO-IBD was 2.0/100,000. Medical treatment with immunomodulators and biological therapy was used extensively, possibly reducing surgery. However, medical treatment remains a complicated balancing of the effect (anti-inflammatory), side effect (cancer risk) and surgery in VEO-IBD.

The Growing Need to Understand Very Early Onset Inflammatory Bowel Disease.

Very Early Onset Inflammatory Bowel Disease (VEO-IBD) represents a cohort of inflammatory bowel disease (IBD) patients diagnosed before 6 years of age. Unlike IBD diagnosed at older ages, VEO-IBD can be associated with underlying primary immunodeficiencies. VEO-IBD has been linked to monogenic variations in over 70 genes involved in multiple pathways of immunity. As sequencing technologies and platforms evolve and become readily available, an increasing number of genes linked to VEO-IBD have emerged. Although monogenic defects are rare in VEO-IBD, diagnosis of these variants can often dictate specific treatment. In this mini-review, we set out to describe monogenic variants previously characterized in multiple patients in the literature that contribute to VEO-IBD, diagnostic tools, unique treatment modalities for specific genetic diagnoses, and future directions in the field of VEO-IBD. Although this mini-review is by no means comprehensive of all the novel monogenic variants linked to VEO-IBD, we hope to provide relevant information that is readily accessible to clinicians and educators.

Characterization of novel and large fragment deletions in exon 1 of the IL10RA gene in Chinese children with very early onset inflammatory bowel diseases

BackgroundDefects in interleukin 10 (IL10) and its receptors are particularly involved in very early onset inflammatory bowel disease (VEOIBD). However, large fragment deletions of IL10 receptor A (IL10RA) are rare.MethodsVEOIBD patients with confirmed mutations in the IL10RA gene were enrolled from January 1, 2019 to June 30, 2020. The clinical features and endoscopic-radiological findings of the patients with large fragment deletions of the IL10RA gene were determined and followed up.ResultsThirty-five patients with IL10RA gene mutations, namely, 28 compound heterozygous mutations and 7 homozygote mutations, were enrolled in this study. Six patients carried the reported point mutation c.301C > T (p. R101RW) or c.537 G > A (p. T179T) in one locus and a large fragment deletion in exon 1 in another locus, which were novel mutations in this gene. A 333-bp deletion of exon 1 (117857034–11857366 del) was the main mutation in this locus in 85.7% of the patients with large fragment deletions. The time of disease onset ranged from birth to 4 years, and diarrhea was the main initial symptom. In total, 6/7 patients had perianal complications, including perianal abscess, fistula and skin tags. Six patients accepted thalidomide treatment, 5/7 accepted mesalamine, 3/7 accepted hematopoietic stem cell transplantation (HSCT), and 3/7 were waiting for HSCT.ConclusionsWe identified a novel large deletion of exon 1 involving the IL10RA gene for the first time and showed the characteristics of VEOIBD patients. This study expands the spectrum of Chinese VEOIBD patients with IL0RA gene mutations.

Genetic Correction of IL-10RB Deficiency Reconstitutes Anti-Inflammatory Regulation in iPSC-Derived Macrophages

Patient material from rare diseases such as very early-onset inflammatory bowel disease (VEO-IBD) is often limited. The use of patient-derived induced pluripotent stem cells (iPSCs) for disease modeling is a promising approach to investigate disease pathomechanisms and therapeutic strategies. We successfully developed VEO-IBD patient-derived iPSC lines harboring a mutation in the IL-10 receptor β-chain (IL-10RB) associated with defective IL-10 signaling. To characterize the disease phenotype, healthy control and VEO-IBD iPSCs were differentiated into macrophages. IL-10 stimulation induced characteristic signal transducer and activator of transcription 3 (STAT3) and suppressor of cytokine signaling 3 (SOCS3) downstream signaling and anti-inflammatory regulation of lipopolysaccharide (LPS)-mediated cytokine secretion in healthy control iPSC-derived macrophages. In contrast, IL-10 stimulation of macrophages derived from patient iPSCs did not result in STAT3 phosphorylation and subsequent SOCS3 expression, recapitulating the phenotype of cells from patients with IL-10RB deficiency. In line with this, LPS-induced cytokine secretion (e.g., IL-6 and tumor necrosis factor-α (TNF-α)) could not be downregulated by exogenous IL-10 stimulation in VEO-IBD iPSC-derived macrophages. Correction of the IL-10RB defect via lentiviral gene therapy or genome editing in the adeno-associated virus integration site 1 (AAVS1) safe harbor locus led to reconstitution of the anti-inflammatory response. Corrected cells showed IL-10RB expression, IL-10-inducible phosphorylation of STAT3, and subsequent SOCS3 expression. Furthermore, LPS-mediated TNF-α secretion could be modulated by IL-10 stimulation in gene-edited VEO-IBD iPSC-derived macrophages. Our established disease models provide the opportunity to identify and validate new curative molecular therapies and to investigate phenotypes and consequences of additional individual IL-10 signaling pathway-dependent VEO-IBD mutations.

A191 TEN YEARS FOLLOW UP OF EARLY ONSET INFLAMMATORY BOWEL DISEASE PATIENTS- A SINGLE CENTER RETROSPECTIVE COHORT STUDY

Abstract Background Early onset inflammatory bowel disease (EOIBD) and Very early onset inflammatory bowel disease (VEOIBD) prevalence has been increasing over the last decades. These young patients have been known to have special disease characteristics and disease location. Although it is known that only a low percentage of these patients require biologic treatment after diagnosis, there is only scarce evidence about their long- term outcome and biologic requirements. Aims To assess the ten year outcome of early onset and very early onset IBD patients. Methods We retrospectively reviewed IBD patients diagnosed under 10 years of age, between January 2005 and December 2009, from the British Columbia (BC) Pediatric IBD database. Disease characteristics and symptoms at diagnosis were documented. The disease location and severity at diagnosis were documented according to the Paris classification. Data collected retrospectively included a ten year treatment follow up period, number of hospitalizations, corticosteroid courses and surgeries. These parameters were documented at three time points: after the first year, after five years and ten years. Results 68 patients under the age of 10 were diagnosed with IBD during the study period. 2 patients failed to meet inclusion criteria and were excluded. Median age at diagnosis was 6.06 (IQR 4.5–8.6). 47.7% of patients had Crohn’s disease and 71.2% were males. 63 patients completed the 5 year follow up, and 52 the 10-year period due to lack of follow up or transfer to adult care. After the first year of follow up 0% patients in the VEOIBD group and 5% patients in the EOIBD group were treated with biologic treatment, whereas after the 10-year period 42.3% and 29.6% of patients were treated with biologic therapy respectively (p=0.282). Overall, 4 patients underwent colectomy and 2 a small bowel resection. Conclusions Although the percentage of VEIBD and EOIBD patients receiving biologic treatment after ten years is higher than after the first year, it is still lower than what is reported in the literature in older pediatric IBD patients and adults. Funding Agencies None

COLORECTAL ADENOCARCINOMA DEVELOPING IN A YOUNG FEMALE WITH OVERLAP SYNDROME AND VERY EARLY ONSET-INFLAMMATORY BOWEL DISEASE: A CASE REPORT

We present a 4-year-old female diagnosed with very-early onset inflammatory bowel disease (VEO-IBD), ulcerative colitis type, and overlap syndrome based on clinical presentation, blood and stool studies, diagnostic endoscopies and liver biopsy. Her clinical course was complicated by pervasive psychological stressors, non-compliance with medical therapy, and frequent provider changes. Initial treatment included Prednisone, 6-mercaptopurine and Ursodiol. Treatment was escalated to include multiple biological agents which were stopped prematurely due to non-adherence.