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Thus, it would be meaningful to explore the expression phenotypes that delineate each TET subtype or overarching multiple subtypes. If these profiles are related to thymic physiology, they will improve our biological understanding of TETs and may contribute to the establishment of a more rational TET classification. Against this background, pathologists have attempted to identify histogenetic features in TETs for a long time. As part of this work, our group has reported several TET expression profiles that are histotype\u2010dependent and related to the nature of thymic epithelial cells (TECs). For example, we found that beta5t, a constituent of thymoproteasome unique to cortical TECs, is expressed mainly in type B thymomas, for which the nomenclature of cortical thymoma was once considered. Another example is the discovery that most thymic carcinomas, especially thymic squamous cell carcinomas, exhibit expression profiles similar to tuft cells, a recently discovered special type of medullary TEC. This review outlines the currently reported histogenetic phenotypes of TETs, including those related to thymoma\u2010associated myasthenia gravis, summarizes their genetic signatures, and provides a perspective for the future direction of TET classification.<\/jats:p>","DOI":"10.1111\/pin.13343","type":"journal-article","created":{"date-parts":[[2023,6,8]],"date-time":"2023-06-08T02:13:48Z","timestamp":1686190428000},"page":"265-280","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Histogenetic and disease\u2010relevant phenotypes in thymic epithelial tumors (TETs): The potential significance for future TET classification"],"prefix":"10.1111","volume":"73","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7952-2706","authenticated-orcid":false,"given":"Yosuke","family":"Yamada","sequence":"first","affiliation":[{"name":"Department of Diagnostic Pathology Kyoto University Hospital Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,6,6]]},"reference":[{"key":"e_1_2_11_2_1","volume-title":"Thoracic tumours. 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