EDN and Eosinophilic Esophagitis

Eosinophilic esophagitis is a recent and emerging chronic disease, secondary to eosinophilic infiltration of the esophageal mucosa leading to esophageal dysfunction. The diagnosis of this pathology, and monitoring of the efficacy of therapies, relies on the assessment of eosinophilic density on esophageal biopsies: follow-up requires numerous digestive endoscopies under general anesthesia, at each therapeutic change, to assess remission. The search for non-invasive biomarkers of active eosinophilic esophagitis is therefore a subject of major interest. The first step is to study EDN (Eosinophil-Derived Neurotoxin), a protein secreted when eosinophils are activated. Several studies have investigated the association between serum EDN, EDN on esophageal brushing or esophageal biopsies with eosinophilic esophagitis activity, and the results look promising. Urinary EDN is associated with atopy but has not been studied in eosinophilic esophagitis. EDN is a biomarker of interest because it is stable over time and, above all, can be measured routinely, making it applicable to routine patient management and care. Our main objective is to evaluate the correlation of EDN in urine, blood and esophageal brushings with the eosinophilic infiltrate counted on esophageal biopsies in patients undergoing upper GI endoscopy at Trousseau Hospital for suspected eosinophilic esophagitis, or as part of the re-evaluation of known eosinophilic esophagitis under treatment. Finally, esophageal and sali…

This description comes directly from the study's public registry record.

Anaïs LEMOINE, Doctor  ·  00 33 1 44 73 60 69  ·  anais.lemoine@aphp.fr

Patrick TOUNIAN, Professor of University  ·  00 33 1 44 73 60 69  ·  p.tounian@aphp.fr

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