Development of a Core Outcome Set for Therapeutic Studies in Eosinophilic Esophagitis (COREOS).

Ma, Christopher; Schoepfer, Alain M; Dellon, Evan S; Bredenoord, Albert J; Chehade, Mirna; Collins, Margaret H; Feagan, Brian G; Furuta, Glenn T; Gupta, Sandeep K; Hirano, Ikuo; Jairath, Vipul; Katzka, David A; Pai, Rish K; Rothenberg, Marc E; Straumann, Alex; Aceves, Seema S; Alexander, Jeffrey A; Arva, Nicoleta C; Atkins, Dan; Biedermann, Luc; ... (2022). Development of a Core Outcome Set for Therapeutic Studies in Eosinophilic Esophagitis (COREOS). Journal of allergy and clinical immunology, 149(2), pp. 659-670. Mosby 10.1016/j.jaci.2021.07.001

Ma_JAllergyClinImmunol_2022.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (457kB) | Preview


Endpoints used to determine treatment efficacy in eosinophilic esophagitis (EoE) have evolved over time. With multiple novel therapies in development for EoE, harmonization of outcomes measures will facilitate evidence synthesis and appraisal when comparing different treatments.


To develop a core outcome set (COS) for controlled and observational studies of pharmacologic and diet interventions in adult and pediatric patients with EoE.


Candidate outcomes were generated from systematic literature reviews and patient engagement interviews and surveys. Consensus was established using an iterative Delphi process, with items voted on using a 9-point Likert scale and with feedback from other participants to allow score refinement. Consensus meetings were held to ratify the outcome domains of importance and the core outcome measures. Stakeholders were recruited internationally and included adult and pediatric gastroenterologists, allergists, dieticians, pathologists, psychologists, researchers, and methodologists.


The COS consists of four outcome domains for controlled and observational studies: histopathology, endoscopy, patient-reported symptoms, and EoE-specific quality of life (QoL). A total of 69 stakeholders (response rate 95.8%) prioritized 42 outcomes in a two-round Delphi process and the final ratification meeting generated consensus on 33 outcome measures. These included measurement of the peak eosinophil count, EoE Histology Scoring System, EoE Endoscopic Reference Score, and patient-reported measures of dysphagia and QoL.


This interdisciplinary collaboration involving global stakeholders has produced a COS that can be applied to adult and pediatric studies of pharmacologic and diet therapies for EoE, which will facilitate meaningful treatment comparisons and improve the quality of data synthesis.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Social and Preventive Medicine (ISPM)
04 Faculty of Medicine > Department of Dermatology, Urology, Rheumatology, Nephrology, Osteoporosis (DURN) > Clinic of Dermatology

UniBE Contributor:

Simon, Dagmar, Safroneeva, Ekaterina


600 Technology > 610 Medicine & health
300 Social sciences, sociology & anthropology > 360 Social problems & social services






[4] Swiss National Science Foundation




Andrea Flükiger-Flückiger

Date Deposited:

27 Jul 2021 15:08

Last Modified:

27 Dec 2022 11:08

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

Eosinophilic esophagitis clinical trials endoscopy endpoints histology histopathology outcomes patient reported outcomes quality of life symptoms




Actions (login required)

Edit item Edit item
Provide Feedback