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Recognized as a distinct entity only two decades ago, the emergence of the disease along with the availability of new technologies has rapidly opened new research avenues and outlined the main features of the pathogenesis of EoE. Yet, each advance in our understanding of the disease has raised new questions about the previous consensus. Currently, new subsets of the disease challenge our diagnostic criteria. For instance, it was believed that EoE did not respond to proton pump inhibitor (<jats:styled-content style=\"fixed-case\">PPI<\/jats:styled-content>) therapy; however, it has now been shown that a substantial proportion of EoE patients indeed respond to <jats:styled-content style=\"fixed-case\">PPI<\/jats:styled-content>s. In addition, a new subset of patients not even presenting eosinophil infiltrates in the oesophagus has also been described. Moreover, approaches for better understanding the heritability of the disease bring into question the dogma of predominant genetic involvement. Furthermore, the specificity and sensitivity of allergy testing for targeted food avoidance is highly controversial, and the production of specific antibodies in EoE now includes IgG4 in addition to IgE. In conclusion, EoE is perceived as \u2018a moving target\u2019 and the aim of this review was to summarize the current understanding of EoE pathogenesis.<\/jats:p>","DOI":"10.1111\/joim.12568","type":"journal-article","created":{"date-parts":[[2016,11,7]],"date-time":"2016-11-07T07:33:11Z","timestamp":1478503991000},"page":"448-457","source":"Crossref","is-referenced-by-count":17,"title":["Eosinophilic esophagitis: unclear roles of IgE and eosinophils"],"prefix":"10.1111","volume":"281","author":[{"given":"C.","family":"Blanchard","sequence":"first","affiliation":[{"name":"Nestl\u00e9 Research Center Lausanne Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Simon","sequence":"additional","affiliation":[{"name":"Department of Dermatology Inselspital Bern University Hospital Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Schoepfer","sequence":"additional","affiliation":[{"name":"Division of 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