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World J Gastrointest Endosc. Feb 16, 2026; 18(2): 114779
Published online Feb 16, 2026. doi: 10.4253/wjge.v18.i2.114779
Eosinophilic esophagitis in children: Clinical perspectives and evolving therapeutic strategies
Arghya Samanta, Gautam Ray, Department of Pediatric Gastroenterology, Institute of Post Graduate Medical Education and Research, Kolkata 700020, West Bengal, India
Vishrut Singh, Department of Pediatrics, Aster Jubilee Medical Complex, Bur Dubai 8703, United Arab Emirates
Bipresh Chakraborty, Department of Internal Medicine, Institute of Post Graduate Medical Education and Research, Kolkata 700020, West Bengal, India
ORCID number: Arghya Samanta (0000-0002-1768-0263); Gautam Ray (0000-0003-3024-149X).
Author contributions: Samanta A designed the overall concept and outline of the manuscript and did the literature review and critical revision of the manuscript; Singh V, Chakraborty B, and Ray G did the literature review, wrote the initial manuscript draft, and contributed to the editing of the manuscript; All authors read and approved the final manuscript.
Conflict-of-interest statement: All authors declare no conflicts of interest in publishing the manuscript.
Open Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Arghya Samanta, Assistant Professor, Department of Pediatric Gastroenterology, Institute of Post Graduate Medical Education and Research, Raebareli Road, Lucknow, Kolkata 700020, West Bengal, India. arghyasamanta2905@gmail.com
Received: September 28, 2025
Revised: October 31, 2025
Accepted: December 10, 2025
Published online: February 16, 2026
Processing time: 128 Days and 17 Hours

Abstract

Eosinophilic esophagitis (EoE) is a chronic, antigen-mediated inflammatory condition of the esophagus, characterized by signs of esophageal dysfunction and characteristic endoscopic and histological features. Currently, EoE has developed from a rare disease entity to a prevalent condition with a rising incidence and prevalence in children. Over the past few decades, a deeper understanding of the underlying pathophysiologic mechanisms of EoE has led to better diagnostic and therapeutic strategies. Pediatric patients with EoE face a diagnostic dilemma due to a wide spectrum in symptomatology as well as limited pharmacological armamentarium. Emerging literature is showing promise, especially with dupilumab, a newer biologic with disease modifying potential. In this review we discussed new diagnostic and treatment strategies and future directions of monitoring EoE in children.

Key Words: Eosinophilic esophagitis; Children; Dupilumab; Transnasal endoscopy; Transcriptomics; Gastroesophageal reflux disease; Food hypersensitivity; Proton pump inhibitor; Glucocorticoids; Elimination diet

Core Tip: Eosinophilic esophagitis is being increasingly diagnosed in children. However, clear guidelines to diagnose and manage these cases are limited. We presented a concise update of the guidelines to simplify management protocols, thus improving patient outcomes.



INTRODUCTION

Eosinophilic esophagitis (EoE) is a chronic, antigen-mediated inflammatory disease of the esophagus, characterized by eosinophil-predominant inflammation and symptoms of esophageal dysmotility. It was first described in 1978 but has been increasingly diagnosed over the past three decades[1]. EoE causes significant impairment of quality of life (QoL) and poses a substantial burden on healthcare resources. An increasing number of studies have highlighted mucosal inflammatory patterns, newer therapeutic targets, and the natural history[2-4]. Two Food and Drug Administration (FDA)-approved medications are available so far for EoE, necessitating further research. The advent of omics technologies, including genomics, transcriptomics, proteomics, etc, provides the latest insights into the genetic and immunological mechanisms. In this review, we discussed novel diagnostic and treatment strategies and future directions in monitoring EoE in children.

METHODOLOGY

A literature search was performed in PubMed and Google Scholar for the period between January 1, 2003 and August 31, 2025. The objective criteria for inclusion were: (1) English language; (2) Peer reviewed; and (3) PubMed cited studies on children. Key concepts were EoE, therapy, diagnosis, epidemiology, randomized clinical trials, and reviews. Keywords associated with each concept were examined and combined.

EPIDEMIOLOGICAL TRENDS

EoE has changed from a rare disease to a common cause of esophageal dysmotility[3]. Following gastroesophageal reflux disease (GERD), it is the second most frequent cause of reflux in children. Furthermore, it now accounts for the majority of cases of impaction of food bolus in older children in the Western population[3,4]. A meta-analysis of population-based studies from North America, Europe, and Australia reported an overall incidence of 3.7/100000 per year [95% confidence interval (CI): 1.7-6.5), which was higher in adults (7/100000 per year; 95%CI: 1.0-18.3) than in children (5/100000 per year; 95%CI: 1.5-10.9)[4]. The prevalence also appeared to be higher in adults than in children (43.4, 95%CI: 22.5-71.2 vs 29.5, 95%CI: 17.5-44.7, respectively) and in the American population compared with the European population[4]. More recently, following the inclusion of patients who are responsive to proton pump inhibitors (PPI) in the EoE spectrum, Navarro et al[5] updated the meta-analysis, including 27 population-based studies, with 14 studies in children. The prevalence in the pediatric population was 34.4 cases per 100000 (95%CI: 22.3-49.2; I2 = 99.7%) with no significant differences between America and Europe (38.3, 95%CI: 23.7-56.4; and 41, 95%CI: 3.2-121.1, respectively)[5]. Multiple factors likely contribute to the variation in prevalence rates, such as methods of data collection, data analysis, case definition, and regional variation of EoE. Diagnostic guidelines prior to 2017 called for the exclusion of PPI-responsive esophageal eosinophilia through a trial of high-dose PPIs and repeat endoscopy before diagnosing EoE[3]. The 2017 guidelines and the 2018 international consensus designated all patients with symptoms of esophageal dysmotility with eosinophil-predominant esophagitis lacking an alternative diagnosis as EoE[2].

Several recent studies from developing countries have reported an increase in the incidence and prevalence of EoE in children, similar to allergic diseases (atopic dermatitis, allergic rhinitis, etc)[6,7]. The latest study from India found a prevalence of 3.5% in children who underwent elective upper gastrointestinal endoscopy (UGIE)[7]. The European Society of Pediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN) 2024 guideline has highlighted that clinicians ought to be aware of the rising prevalence[3].

PATHOPHYSIOLOGY

EoE is caused by a complex interplay between genetic predisposition, environmental triggers, and immune dysregulation[8,9]. Figure 1 depicts the interaction between genetic susceptibility, environmental stimulants, and immune dysregulation in the pathogenesis. Esophageal epithelial barrier dysfunction allows food allergens to induce thymic stromal lymphopoietin (TSLP)/interleukin (IL)-33, leading to stimulation of type 2 helper T (Th2) cells, natural killer cells, mast cells, and basophils[10,11]. These cells stimulate IL-4, which induces Th2 differentiation. IL-4 and IL-13 induce chemokine (C-C motif) ligand 26 (CCL26), which further stimulates eosinophils to secrete IL-5. IL-5, secreted by Th2 cells and mast cells, also stimulates eosinophils. Mast cells also induce transforming growth factor-beta 1, which stimulates eosinophils and fibroblasts responsible for fibrosis and tissue remodeling[11].

Figure 1
Figure 1 Various steps in the pathogenesis of eosinophilic esophagitis and the drugs targeting specific therapeutic targets. Food and aeroallergens act as triggers. Altered epithelial integrity helps increase antigen exposure to antigen-presenting cells that starts a type 2 helper T cell-mediated inflammatory cascade. This causes tissue inflammation and damage. Activation of transforming growth factor-beta leads to fibrosis and tissue remodeling. Various group of drugs have been depicted, targeting specific target molecules along the proinflammatory cascade. CCL26: Chemokine (C-C motif) ligand 26; Ig: Immunoglobulin; IL: Interleukin; ILC2: Innate lymphoid cell 2; TGF-β: Transforming growth factor beta; TSLP: Thymic stromal lymphopoietin; TSPAN: Tetraspanin; pIL-33: Plasmin interleukin 33; mIL-33: Murine interleukin 33; RIPK1: Receptor interacting serine/threonine protein kinase 1; SPINK: Serine protease inhibitor Kazal; TH2: T helper 2; CD4: Cluster of differentiation 4.

Recent studies have identified the role of additional cytokines in the pathogenesis of EoE[12-14]. Collison et al[12] in an interesting study found that tumor necrosis factor-related, apoptosis-inducing ligand controlled midline-1 and TSLP expression, inflammation, and fibrosis in experimental models. de Souza et al[13] in another study found macrophage migration inhibitory factor as an inducing agent for eosinophils in a murine model. Dutt et al[14] established that allergen-induced IL-18 promoted IL-5-and natural killer-T-dependent EoE pathology.

OMICS ERA IN EOE
EOE genomics

With fast advances in technologies, such as genomics, epigenetics, transcriptomics, etc, new insights into the genetic and immunologic mechanisms are being unfolded[11,15-18]. Six studies have identified genetic loci associated with EoE, proving the genetic causality[10,11,16-19]. A genome-wide association study by Rothenberg et al[20] involving 181 European children with EoE and 170 healthy controls found an important genetic association with chromosome 5q22 encoding TSLP.

Two meta-analyses and four genome-wide association studies identified 41 variant loci and 27 suggestive loci[20-25]. A whole exome sequencing study by Rochman et al[26] involving 33 unrelated patients with EoE identified 39 rare mutations across 18 genes, including SERPINB3, SPINK5, CAPN14, KRT6B, and GABRP. However, EoE is a rare disease, and currently available data is insufficient for a comprehensive understanding of this complex disease.

EoE epigenetics

Epigenetics is an emerging field in genetic research, and studies have identified changes in DNA methylation that have an effect on gene expression[27,28]. DNA methylation of 20 children with and without EoE identified the 25 methylated CpG loci as biomarkers to differentiate active disease from controls[29]. These loci helped in diagnostics but maintained distinct profiles from healthy controls. The findings of this study shed light on their potential as a useful diagnostic and monitoring tool.

TRANSCRIPTOMICS

Our understanding of EoE pathogenesis evolved when gene expression analysis of esophageal tissues noticed a unique transcriptome profile[30-32] that distinguishes active EoE from inactive EoE and healthy controls[33-36]. In-depth transcriptomic study have unveiled a unique gene expression profile in EoE, associated with a type 2 immunity response and the epithelial barrier. CCL26, the eosinophil chemoattractant, has been found to be the uniquely upregulated gene among the EoE transcriptome, establishing a clear association with eosinophil levels in esophageal biopsies[37].

The EoE transcriptome shows differential expression of various genes linked to mast cells (CPA3 and TPSAB1), emphasizing the significant role of mast cells in the EoE inflammatory response[30,38]. Genes such as filaggrin and involucrin, which are crucial for epithelial differentiation and barrier function, also exhibit unique expression patterns in EoE[37]. Interestingly, certain transcriptomic changes persist despite EoE remission, such as periostin (POSTN), which is involved in fibrosis and tissue remodeling[39,40]. Upregulation of POSTN in esophageal fibroblasts causes fibrosis[41]. The high levels of POSTN promote eosinophil adhesion, collagen production, and fibrosis, leading to tissue remodeling.

Higher levels of CCL26 and tryptase in pretreatment esophageal biopsies have been linked with better response to steroid therapy. On the contrary, upregulated IL-5 and IL-13 pathways promote profibrotic cascade and are linked with steroid resistance and more fibrostenosis.

PROTEOMICS

Proteomic studies have helped in further understanding EoE pathogenesis, identifying potential biomarkers and therapeutic targets. The minichromosome maintenance complex, seen in proliferative epithelial cells, had higher expression in the esophagus of EoE[42]. Another proteomic research study by Kaymak et al[43] identified elevated levels of IL-20 subfamily cytokines in patients with active EoE. This study further suggested that these cytokines should be studied as novel therapeutic targets[43]. Another study by Hsieh et al[44] identified thrombospondin-1 as a pathogenic mediator of EoE fibrosis.

CLINICAL FEATURES

The clinical features of EoE vary depending on the age of the child[45-47]. Infants and young children usually have nonspecific symptoms such as vomiting, refusal to feed, and failure to thrive, making the diagnosis difficult. This is the reason a higher index of suspicion is required in such cases. Older children and adolescents can have dysphagia, chest pain, heartburn, regurgitation, and food bolus impaction as a more fibrostenotic disease phenotype is seen in them due to longer disease duration.

In a study of 43 children with EoE (86% male, mean age 8.4 years), Rodrigues et al[48] found that the most common symptoms were nausea, vomiting, and abdominal pain (100%) in children younger than 7 years while heartburn (52%) and food impaction (48%) were the most common symptoms in children older than 7 years. The prevalence of EoE among UGIE performed in children with food bolus impaction and/or dysphagia was high (63%-88%)[49-51]. Therefore, the index of suspicion should be high, and these patients should undergo UGIE and esophageal biopsy. When symptoms are refractory to medical treatments for GERD, EoE should be strongly considered.

DIAGNOSTIC DILEMMAS

Making a diagnosis of EoE is difficult because of variable clinical presentation and less awareness about endoscopic features and taking appropriate biopsies. Furthermore, esophageal eosinophilia can be found in several other diseases, leading to a diagnostic dilemmas[3,46].

The diagnostic criteria of EoE have undergone several changes in the past two decades with a better understanding of the disease pathophysiology and emerging evidence. In the 2014 guidelines a PPI trial was an essential criterion before making a diagnosis of EoE[52]. The 2018 consensus rewrote the diagnostic criteria and removed the PPI trial from it[2]. The latest internationally accepted diagnostic criteria is: The presence of ≥ 15 eosinophils/high power field (hpf) (× 400 magnification) in either half of the esophagus with the absence of eosinophils in the gastric and duodenal mucosa[2]. Following suit, the ESPGHAN 2024 guideline adopted the latest internationally accepted definition[3]. It is imperative to note that at least six biopsies from ≥ 2 esophageal levels, including proximal and distal as well as additional gastric and duodenal biopsies, should be taken for definitive diagnosis. The lack of gastric/duodenal eosinophilia is supportive of EoE; however, the presence of gastric/duodenal eosinophilia is not sufficient to rule out EoE when the clinical context fits. According to the latest guidelines, patients without clinical symptoms of esophageal dysfunction cannot be diagnosed as EoE even in the presence of esophageal eosinophilia[2].

EoE is an antigen-driven, eosinophil-predominant disorder with Th2 cytokine profile. The majority of patients with EoE (43%-70%)[3,7] may have a family history of allergic disease[53-57]. Peripheral eosinophilia could be seen in 8.6%-33.0% of patients with EoE[7,55,58].

Testing for allergic sensitization has been used in patients with EoE. Various methods are advocated: Skin prick test; atopy patch testing; or allergen-specific IgE levels. However, an EoE trigger has not been identified. Additionally, their positive predictive value and clinical correlation remain poor and uncertain as a non-IgE medicated inflammatory response seems to be the predominant pathway for EoE pathogenesis[52,59]. Hence, these tests are not currently recommended for the diagnosis of EoE[3,52]. Considering the limitations of applying allergy-based testing in the pediatric population, the ESPGHAN 2024 guideline also recommends against using available allergy testing to routinely diagnose and treat EoE[3]. The EoE Endoscopic Reference Score (EREFS) is a validated score, endorsed in the latest ESPGHAN guideline to report pathologic endoscopy changes[3,60,61]. The EREFS classification system rates the severity of edema (0-2), circular rings (0-3), exudates (0-2), furrows (0-2), and strictures (0 and 1) and is graded separately for each third of the esophagus[61]. A score of 2 or greater is often used as a diagnostic threshold. The EREFS score correlates well with the degree of esophageal eosinophilia and is used for monitoring symptom response.

Similarly, the EoE Histology Scoring System (EoEHSS), comprising of peak eosinophil count (PEC), basal zone hyperplasia, esophageal atresia (EA), eosinophil surface layering, dilated intercellular spaces, surface epithelial alteration, dyskeratotic epithelial cells, and lamina propria fibrosis, has been newly developed and validated in the pediatric population and could serve as a useful diagnostic and monitoring tool[62].

Both EREFS and EoEHSS correlate well with PEC and can be used for disease activity monitoring. Interobserver agreement for both is generally fair, but it varies by endoscopic/microscope features. Table 1 summarizes the differences between the 2014 and 2024 ESPGHAN guideline recommendations.

Table 1 Main differences between 2024 and 2014 guidelines by European Society of Pediatric Gastroenterology, Hepatology and Nutrition.

2024 ESPGHAN guidelines
2014 ESPGHAN guidelines
Trail of PPI as part of diagnostic criteriaPPIs no longer used as a diagnostic tool; rather as a treatment optionPPIs used to define EoE by documenting nonresponse to PPI
Eosinophilic involvement of other segments of the GI tract does not exclude the diagnosis of EoEEoE may coexist with eosinophilic infiltration of other segments of the GI tractNot addressed
Clinical symptom assessment tools (Pediatric EoE Symptom Score)Advocated for assessing treatment response and monitoringNot discussed
EREFSEREFS score discussed; needs further evaluationSubjective observations discussed
Biopsy protocol and reportingFollow-up endoscopy with biopsies generally recommended 8-12 weeks after initiating or making a major change to therapy or symptom flare. Every 1-3 years in asymptomatic cases during maintenanceNot discussed in detail
Histology scoresEosinophilic Esophagitis Histology Severity Score discussed; need for report format that is comparable between centersPeak eosinophil cutoff/high power field discussed and subjective assessment of ancillary findings
Systemic steroidsA short course of systemic steroids may be used as treatment option for severe pediatric EoE associated stricturesNot specifically mentioned for use
BiologicsFirst biologic approved by Food and Drug Administration and for children > 1 years of ageNo biologics advocated
Biomarkers and noninvasive techniquesDiscussed in current guidelineNot discussed
Quality of lifeAddressed in current guidelineNot discussed
RISK FACTORS FOR EOE

Children with successful repair of EA are known to carry higher risk of EoE[63-65]. Various reasons have been postulated: Firstly, disease confounders (post-surgery GERD, esophageal dysmotility, repeated instrumentations) cause increased allergen exposure, and microdeletion involves the forkhead box transcription factor[64,65]. Forkhead box transcription factor binding sites are expressed in the promoter region of genes responsible for the mesenchymal proliferation of the esophagus and trachea. In addition, it is also expressed in the promoter region of proinflammatory genes, such as eotaxin[65]. Around 101 cases of EoE in EA were reported worldwide so far with prevalence rates ranging from 6% to 17%[63-66]. Dhaliwal et al[63] from Australia reported an incidence of 17% in a cohort of 103 children with EA. In the author’s own anecdotal experience, out of the six children with EA, EoE (16.6%) was diagnosed in a 7-year-old boy, who was refractory to dilatation[67]. Twelve weeks of PPI reduced esophageal eosinophil concentration as well as the need for further dilatation. Basic study is of the utmost importance to establish the etiological association.

Both EoE and inflammatory bowel disease (IBD) share common immune dysfunction with abnormalities in helper T cells and epithelial barrier function[68]. Co-occurrence of these diseases has been reported[69,70]. Moore et al[69] reported that the prevalence of EoE among 4515 American children with IBD as approximately 1.5%. A study found EoE in 11/3090 (0.35%) Italian children with IBD[70]. More genetic studies should be performed.

MANAGEMENT

The main objectives of the management of EoE are the achievement of histological remission that may avoid long-term complications, improvement of clinical symptoms, and restoration of normal growth[3]. In the pediatric population the current EoE treatment strategies can be categorized into three ‘D’s: (1) Dietary therapy; (2) Drugs; and (3) Dilatation for strictures. There is a scarcity of randomized trials to define the best approach. Choosing the best treatment option among them depends on the disease endotype (presence of strictures, nutritional status) after discussion with the family with an emphasis on shared decision-making. Figure 2 describes a stepwise approach to deciding the initial treatment modality, monitoring, and long-term maintenance plan in patients with EoE.

Figure 2
Figure 2 Stepwise approach to deciding therapeutic modalities, follow-up evaluation, and long-term monitoring. FED: Food elimination diet; PPI: Proton pump inhibitor; SFED: Six-food elimination diet; UGIE: Upper gastrointestinal endoscopy.
DIETARY THERAPY

Given the role of food allergens in triggering EoE, dietary elimination may provide symptom resolution, improvement in growth parameters, esophageal inflammation, and potentially esophageal subepithelial fibrosis[71]. Three different approaches for food avoidance are available: (1) An empirical elimination diet; (2) A testing-directed diet; and (3) An elemental diet. The role of a clinical nutritionist is of paramount importance in this regard.

The most commonly followed dietary approach is a six-food elimination diet (SFED) that accounts for six major food groups involved in EoE (milk, egg, soy, wheat, peanuts/tree nuts, and seafood). The efficacy of SFED ranges from 57%-81%[3,72]. However, adherence with such a restrictive dietary approach is difficult to follow, raising the question of a less-restrictive dietary protocol as the initial step. Studies have found that peanut/tree nut and seafood are rare triggers for EoE[73]. Subsequently, less restrictive dietary approaches with a four-food group elimination diet (4FED) and two-food elimination diet have been used with more favorable adherence and comparable efficacy[3,74]. A one-food elimination diet (1FED) (only milk) was tried successfully in children with a histological remission rate of 50%-65%[75,76]. More recently, Kliewer et al[77] performed a randomized controlled trial (RCT) among 63 children divided into 2 groups: (1) 1FED (n = 38); and (2) 4FED (n = 25). The histological remission rates (41% vs 44%; P = 1.00), histology scoring system (-0.25 vs -0.29; P = 0.77), endoscopic reference score (-1.10 vs -0.58; P = 0.47), QoL scores, and transcriptomic outcomes were comparable between the two groups. The authors concluded that 1FED is a reasonable first-choice therapy for pediatric EoE.

Elimination diets suggest an overall success rate that varies between 45% and 90% depending on the different approaches. The SFED and 4FED achieve high remission rates but with high patient nonadherence because of low palatability. In addition, detrimental effects of nutritional deficiency, decreased QoL, psychological impact, and the risk of developing feeding disorders (e.g., anorexia and bulimia, especially in adolescents) needs to be considered. A detailed discussion with family members should be done to decide the initial therapeutic choices.

DRUGS
PPI

PPIs are now one of the biggest advances in the management of EoE[78]. Over the last few years, PPIs have evolved from being an agent for a PPI trial to the main factor of PPI-responsive esophageal eosinophilia and a definitive therapeutic option for EoE[79]. Downregulation of CCL26, IL-5, and IL-3 in biopsies was found for PPI, similar to patients receiving steroids[79]. PPIs restore the integrity of the leaky esophageal epithelium and help in reducing endoscopic features of circular rings[80]. Given the ease of administration and good safety profile, PPIs are the first-line therapy, especially among patients with milder symptoms and an inflammatory endotype. They are used at high dosages (e.g., 1-2 mg/kg, often twice daily) for their anti-inflammatory properties. The efficacy of PPIs to induce clinical and histopathological remission of EoE has been shown in multiple observational studies[80-82]. A systematic review of 33 studies found that double doses of PPI led to histopathological remission in nearly half the patients and symptomatic improvement in 60% of children at week 12, regardless of patient age, study design, or type of PPI evaluated[83]. According to the 2024 guidelines, PPIs are the first-line therapy on the same level as steroids and diet[3].

Topical steroid

Owing to its high efficacy in patients with EoE, topical corticosteroids are often used as first-line treatment in more severe cases or in those with failed PPI therapy. The most common topical steroids are swallowed/inhaled fluticasone propionate 88-440 μg BID-QID (maximum 880-1760 μg). Various studies have shown the efficacy of topical steroids to range from 45%-82%[84-86]. Recently, oral viscous budesonide [dosage < 10 years of age: 0.5 mg BID (maximum 4 mg), > 10 years of age: 1 mg BID (maximum 4 mg)] has received FDA approval for use in patients with EoE with a histological remission rate of 54% at 6 weeks and 84% at 12 weeks[87]. In the latest ESPGHAN guidelines, the use of short-term systemic steroids (1-2 mg/kg/day; twice daily dosing) is advocated to reduce the sessions for dilation in moderate to severe strictures[3]. Topical steroids can cause local adverse events such as esophageal candidiasis while adrenal insufficiency could be a side effect in those receiving long-term systemic steroids.

BIOLOGICS

Given the role of different immunological pathways in the pathogenesis of EoE, various biologics have been used in patients with EoE with mixed results. Anti-IgE agents (omalizumab), anti-IL-5 agents (mepolizumab), anti-IL-13 agents (QAX576), and anti-tumor necrosis factor-alpha agents (infliximab) have been used but with no encouraging results[88-91].

DUPILUMAB: THE NEW KID ON THE BLOCK

Dupilumab targets the IL-4 receptor alpha subunit, inhibiting both IL-4 and IL-13 signaling. It has shown promising results in children with refractory EoE[92,93]. Chehade et al[93] in a RCT in pediatric patients with EoE showed that dupilumab resulted in histologic remission (PEC < 15/hpf, primary end point) in a significantly higher percentage of children (aged 1-11 years) with EoE than placebo at week 16 (68% with higher-exposure vs 58% with lower-exposure subcutaneous dupilumab regimen vs 3% in placebo group placebo, P < 0.001). Minor adverse events such as headache, nausea, injection site reaction, urticaria, and upper respiratory tract infections were reported. On May 20, 2022, dupilumab was FDA-approved as the first drug for EoE for children aged 12 and above[92]. The FDA has approved dupilumab for children > 1 year or body weight more than 15 kg in 2024, a ray for hope for pediatric patients with EoE[93]. However, long-term safety and efficacy data is still lacking. We need further long-term studies of dupilumab in pediatric patients with EoE.

MAINTENANCE IN CHILDREN WITH EoE

Pediatric natural history studies are scarce for EoE. However, long-term studies in adult patients clearly suggest that untreated active EoE can lead to fibrostenotic complications, needing more endoscopic interventions, and poor QoL[94]. Alexander et al[94] followed up 101 patients with EoE over a median follow-up duration of 17 months and found that the overall histological relapse rate was 44%. In addition, they found that the relapse rate among those patients on high-dose and low-dose PPI maintenance therapy was 33% and 35%, respectively, while the relapse rate for those not on any maintenance was 86%. The majority of the relapses were asymptomatic. Hence, both adult and pediatric guidelines recommend periodic monitoring and maintenance therapy[3,95]. The monitoring targets are histologic remission (PEC < 15 eos/hpf), EREFS improvement, symptom resolution, and improvement of growth parameters. No consensus has been reached about the ideal medication, dosage, and duration. Low-dose PPI, topical steroid, and dupilumab are certain drugs used for this purpose[3]. Montelukast is not effective as a maintenance therapy[3].

MONITORING
When to monitor

The ESPGHAN 2024 guideline has recommended UGIE and histopathology every 1-3 years in patients with stable clinical remission[3]. Endoscopy is also advocated in cases of symptomatic flare or major treatment changes. However, many experts advocate for a personalized monitoring schedule based on the individual disease endotype and transcriptomic profile.

Monitoring tools

Endoscopy and histopathology remain the gold standard monitoring tools[3]. For endoscopic evaluation EREFS, an accurate and validated tool, should be used and each third of the esophagus should be graded separately as per the EREFS[60,61]. In addition to monitoring the PEC/hpf, EoEHSS should be used for better identification of disease activity[62]. Additionally, it can also predict the therapeutic responsiveness of individual patients[96].

NONINVASIVE TOOLS

The Pediatric EoE Symptom Score has been endorsed for evaluating treatment response and disease monitoring[3,97]. However, there is a poor correlation between the symptoms score and histopathological findings. The reasons could be: (1) Post-inflammatory esophageal remodeling; (2) Esophageal hypersensitivity; and (3) Avoidant eating behavior. To identify the avoidant eating behavior, the IMPACT questionnaire is usually used. The IMPACT questionnaire includes: (1) Imbibe more water with food; (2) Modify meal (cut piece, pore); (3) Prolonged meal time; (4) Avoid hard-textured food; (5) Chew excessively; and (6) Turn away tablet/pills. These adaptive behaviors correlate well with active EoE and decreased esophageal distensibility. The Pediatric EoE Symptom Score correlates poorly with tissue activity, and endoscopy with histology remains the reference standard.

Multiple endoscopies during the food reintroduction put extra financial and psychological burdens on the patient. Hence, transnasal endoscopy is being increasingly used for performing biopsy during follow-up. Transnasal endoscopy can be done with a 2.8 mm or 4.0 mm diameter bronchoscope in awake conditions without anesthesia and as an outpatient procedure, thus reducing the cost. Studies on children with EoE have shown that the tissues obtained by this technique is comparable with those generated during standard endoscopy with good histological correlation, fewer adverse events, lesser cost (approximately half), and high patient satisfaction[98-101]. There are no absolute contraindications for transnasal endoscopy [relative contraindications. Patients with nasal trauma, prior nasal surgery, and recurrent nasal bleeding can safely undergo this procedure. It is safe in children as young as 4 years[3].

Minimally/noninvasive disease-monitoring methods and biomarkers (eosinophilic cationic protein; eosinophil-derived neurotoxin, eosinophil peroxidase; major basic protein, CCL26, POSTN, mast cell tryptase) are being investigated. Cytosponge is a sponge-containing capsule that collects esophageal tissue as it is pulled back after being swallowed. It can be an easy method to assess inflammation[3,102]. Another monitoring tool is the esophageal string test that monitors eosinophil-derived granule proteins from secretions for the esophagus that stick to the string as it is removed[103,104]. However, these studies are not RCTs, had a small sample size, and used outdated diagnostic criteria for EoE. Esophageal string test and cytosponge are promising but still investigational in children. Hence, these methods need further validation studies for definitive recommendations in routine clinical practice.

Numerous biomarkers such as eosinophil peroxidase, eosinophil cationic protein, IL-10, and anti-NC1A142 (collagen XVII) IgG4 are under investigation[3]. They remain investigational, and no definitive recommendation exists for their use in diagnosis or clinical monitoring. Table 2 summarizes all the potential biomarkers and the tissues where they are tested.

Table 2 Potential new biomarkers for disease activity monitoring in patients with eosinophilic esophagitis.
Biomarker
Tissue specimen
Clinical utility
Evidence maturity (clinical use vs investigational)
Mucosa
Blood
Feces
Eosinophil cationic proteinYesYesYesDisease activity monitoring, predict endoscopy severity, predict treatment responseInvestigational
Eosinophil-derived neurotoxinYesYesYesDisease activity monitoring, predict treatment responseInvestigational
Eosinophil peroxidaseYesYesNoDisease activity monitoring, predict treatment responseInvestigational
Major basic proteinYesYesNoDisease activity monitoringInvestigational
Mast cell tryptaseYesNoNoDisease activity monitoringInvestigational
Chemokine (C-C motif) ligand 26YesYesNoDisease activity monitoringInvestigational
PeriostinYesNoNoDisease activity monitoringInvestigational
MicrobiomeYesNoNoDisease activity monitoringInvestigational

Functional imaging, such as endoluminal functional imaging system have been used as adjuncts in adult patients with EoE to assess the esophageal distensibility[105]. Mucosal biopsy gives an idea about the epithelial inflammation, but there is little information about submucosal fibrosis that is responsible for distensibility and stricture formation. The pediatric literature is limited in the form of case series[106]. Mucosal impedance is a promising, rapid, and less invasive method to monitor EoE activity[107]. However, these methods need larger studies with more data about its clinical utility.

CLINICAL DECISION MAKING IN RESOURCE-LIMITED SETTINGS

In resource-limited settings, caregivers need to take into consideration the nutritional access, endoscopy capacity, family counselling, and shared decision making before deciding therapeutic choices and monitoring schedules.

FUTURE DIRECTIONS

The field of EoE is ever changing with new innovations. Table 3 summarizes all the practice changers that happened from 2023 to 2025. Newer medications (CRTH2 antagonist, lirentelimab) are being tested as a potential treatment for EoE. The KRYPTOS trial found that lirentelimab (siglec-8 blockers) leads to significant eosinophil reduction in esophageal biopsy[108]. The long-term complications can be responsible for poor QoL, necessitating it to make psychosocial support an integral part of patient care[3]. Also, transcriptome analysis has revolutionized the management of EoE, identifying characteristic molecular signatures. Challenges in integrating diverse omics data persist. Machine learning is emerging as a valuable tool. The integration of multi-omics data promises significant advancements in our understanding of EoE by identifying biomarkers for diagnosis, predicting therapeutic responses, and monitoring natural history. Finally, in the era of artificial intelligence, EoE provides a concrete pediatric use-case that could benefit from the artificial intelligence capabilities such as endoscopic image scoring, histology quantification, treatment response prediction, and the methodological and translational toolkit needed to operationalize the EoE recommendations.

Table 3 Eosinophilic esophagitis: Practice changers in 2023-2025.
EoE: Practice changers in 2023-2025
Removal of mandatory proton pump inhibitor trial
Routine use of endoscopic reference score/EoE histologic scoring system
Pragmatic 1-food elimination as a first step
Food and Drug Administration approval of dupilumab for refractory cases
Transnasal endoscopy for monitoring endoscopies during maintenance
CONCLUSION

EoE is no longer a rare disease. It is riddled with considerable diagnostic and therapeutic challenges. Ongoing research has led to deeper understanding of the disease process and newer therapeutic targets. Dupilumab holds promise as a treatment modality. It is of the utmost importance to evaluate the least/noninvasive diagnostic tool for the assessment of disease activity and the optimal treatment regimen to develop the latest treatment options.

Footnotes

Provenance and peer review: Invited article; Externally peer reviewed.

Peer-review model: Single blind

Specialty type: Gastroenterology and hepatology

Country of origin: India

Peer-review report’s classification

Scientific Quality: Grade B, Grade C, Grade D

Novelty: Grade B, Grade C, Grade D

Creativity or Innovation: Grade B, Grade C, Grade D

Scientific Significance: Grade B, Grade C, Grade D

P-Reviewer: Machado NC, PhD, Associate Professor, Postdoctoral Fellow, Brazil; Ogut E, PhD, Associate Professor, Senior Researcher, Senior Scientist, Türkiye S-Editor: Luo ML L-Editor: Filipodia P-Editor: Zheng XM

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