Esophageal remodeling occurs during the development of eosinophilic esophagitis (EoE); syndecan-1, also known as CD138, is a cell surface marker involved in extracellular remodeling and it has been shown to be differentially expressed in tissue from patients with EoE compared to healthy esophageal tissue. University of North Carolina at Chapel Hill researchers conducted studies to validate serum CD138 levels as a noninvasive tool for the diagnosis of EoE.