New markers like eosinophilic progenitor cells [53, 54], a new panel of blood mRNA levels containing CD274, CD101, CXCR6, TCRδ, Jα18, and FCεRII [55, 56] or urine 3‐BT level in creatinine [57] may be used to detect or monitor EoE patients in the future. This evidence concerns the gene FCER2 and eosinophilic esophagitis.