This observational research study is to better understand patients with eosinophilic esophagitis (EoE) who have recently been prescribed DUPIXENT® (dupilumab). The purpose of this research study is to look at how DUPIXENT is used in normal care of patients with EoE.

Possible benefits to others include a better understanding of EoE and helping to inform research and clinical trial design leading to treatment decisions in this patient population going forward.

This proposal is to contribute to data registry and sample bank called Pediatrics Biorepository for Gastroenterology Clinical Research. Samples collected in this study may be used for future research which plan to advance the state of science in the hopes to develop novel diagnostic approaches and identify therapeutic targets.

The study will compare the effectiveness of endoscopic surveillance and endoscopic eradication therapy (EET) for the management of Barrett's esophagus (BE) and low-grade dysplasia (LGD).