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Owing to the lack of specific genetic alterations in the vast majority, most currently defined entities show overlapping morphological and immunophenotypic features, and therefore pose a challenge to the diagnostic pathologist. In the light of recent immunophenotypic, cytogenetic and molecular genetics advances in the field of T\u2010cell and T\/<jats:styled-content style=\"fixed-case\">NK<\/jats:styled-content>\u2010cell lymphomas, the focus of the lymphoma workshop of the European Association for Haematopathology\/Society for Hematopathology meeting in Lisbon, Portugal, in October 2012 was to refine existing diagnostic criteria and clarify the borders between overlapping entities. The panel reviewed over 200 submitted cases, which were grouped into five categories: (i) angioimmunoblastic T\u2010cell lymphoma and T\u2010follicular\u2010helper\u2010cell\u2010associated lymphomas; (ii) <jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content>30\u2010positive T\u2010cell lymphomas\/lymphoproliferative diseases; (iii) extranodal T\u2010cell and <jats:styled-content style=\"fixed-case\">NK<\/jats:styled-content>\u2010cell neoplasms; (iv) <jats:styled-content style=\"fixed-case\">EBV<\/jats:styled-content>\u2010associated T\u2010cell\/<jats:styled-content style=\"fixed-case\">NK<\/jats:styled-content>\u2010cell lymphomas\/lymphoproliferative diseases; and (v) peripheral T\u2010cell lymphoma, not otherwise specified, post\u2010transplant lymphoproliferative disorders, and mimics. This report summarizes the discussions and conclusions of the workshop, which question current diagnostic criteria and provide recommendations for refining existing classifications.<\/jats:p>","DOI":"10.1111\/his.12251","type":"journal-article","created":{"date-parts":[[2013,8,13]],"date-time":"2013-08-13T07:32:31Z","timestamp":1376379151000},"page":"171-199","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":157,"title":["Peripheral T\u2010cell and <scp>NK<\/scp>\u2010cell lymphomas and their mimics; taking a step forward \u2013 report on the lymphoma workshop of the <scp>XVI<\/scp>th meeting of the European Association for Haematopathology and the Society for Hematopathology"],"prefix":"10.1111","volume":"64","author":[{"given":"Ayoma D","family":"Attygalle","sequence":"first","affiliation":[{"name":"Department of Histopathology Royal Marsden Hospital London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9","family":"Cabe\u00e7adas","sequence":"additional","affiliation":[{"name":"Servi\u00e7o de Anatomia Patol\u00f3gica IPOLFG Lisboa Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philippe","family":"Gaulard","sequence":"additional","affiliation":[{"name":"Department of Pathology Assistance Publique, H\u00f4pitaux de Paris (AP\u2013HP) Groupe hospitalier Henri Mondor\u2013Albert Chenevier Cr\u00e9teil France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elaine S","family":"Jaffe","sequence":"additional","affiliation":[{"name":"Hematopathology Section Laboratory of Pathology National Cancer Institute Center for Cancer Research Bethesda MD USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daphne","family":"de Jong","sequence":"additional","affiliation":[{"name":"Department of Pathology VU University Medical Centre Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Young Hyeh","family":"Ko","sequence":"additional","affiliation":[{"name":"Department of Pathology Samsung Medical Centre Sungkyunkwan University Seoul Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan","family":"Said","sequence":"additional","affiliation":[{"name":"Department of Pathology David Geffen School of Medicine University of California Los Angeles CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wolfram","family":"Klapper","sequence":"additional","affiliation":[{"name":"Department of Pathology Haematopathology Section and Lymph Node Registry University of Kiel Kiel Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,10,16]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/annonc\/mdf033"},{"key":"e_1_2_8_3_1","volume-title":"World Health Organization classification of tumours of the haematopoietic and lymphoid tissues","author":"Swerdlow SH","year":"2008"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1182\/blood-2006-10-055145"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1182\/blood-2004-03-1206"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1182\/blood-2012-02-408542"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1182\/blood-2010-08-303305"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1097\/PAS.0b013e3181971591"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1097\/PAS.0b013e318222dfcd"},{"key":"e_1_2_8_10_1","first-page":"224","article-title":"Indolent T\u2010cell lymphoproliferative disease of the gastrointestinal tract: report of seven cases","volume":"3","author":"Perry AM","year":"2013","journal-title":"J. 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