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The aim of this study was to evaluate the clinical applicability of HEG1 as a marker in the diagnosis of mesothelioma. HEG1 immunoreactivity was evaluated in whole sections of 122 mesotheliomas, 75 pulmonary carcinomas, 55 other carcinomas, 16 mesenchymal tumors, and 24 reactive mesothelial proliferations and in tissue microarrays containing 70 epithelioid (EM), 36 biphasic (BM), and 2 sarcomatoid mesotheliomas (SM). In whole sections and tissue microarrays, respectively, membranous HEG1 was expressed in 93.0% and 85.5% of EM, 81.3% and 69.4% of BM, 0% and 0% of SM. HEG1 was not expressed in pulmonary adenocarcinomas. HEG1 was expressed as cytoplasmic immunoreactivity in pulmonary squamous cell carcinomas (21.7%). Membranous HEG1 staining was seen in ovarian carcinomas (66.7%), thyroid carcinomas (100%), reactive conditions (16.7%), and mesenchymal tumors (18.8%). The sensitivity of membranous HEG1 expression to distinguish EM\/BM from all carcinomas was 88.8%. The specificity for the differential diagnosis between EM\/BM and all carcinomas and pulmonary carcinomas was 92.3% and 98.7%, respectively.<\/jats:p>","DOI":"10.1111\/pin.13140","type":"journal-article","created":{"date-parts":[[2021,7,9]],"date-time":"2021-07-09T08:11:46Z","timestamp":1625818306000},"page":"604-613","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Membranous HEG1 expression is a useful marker in the differential diagnosis of epithelioid and biphasic malignant mesothelioma versus carcinomas"],"prefix":"10.1111","volume":"71","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0865-0820","authenticated-orcid":false,"given":"Kenzo","family":"Hiroshima","sequence":"first","affiliation":[{"name":"Department of Biochemistry and Genetics Chiba University Graduate School of Medicine  Chiba Japan"},{"name":"Department of Pathology, Tokyo Women's Medical University Yachiyo Medical Center  Yachiyo 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