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There have also been recent descriptions of a form of \u201cintertriginous MF\u201d that is characterized by skin fold involvement and the expression of T follicular helper (TFH) markers, and that often has an aggressive course. We describe the case of a 48\u2010year\u2010old man affected by MF associated with AN, whose lesions were characterized by a TFH immunophenotype and the expression of the GATA\u20103 nuclear master regulator that may be related to a TFH\u20102 subpopulation or possible disease progression.<\/jats:p>","DOI":"10.1111\/cup.14405","type":"journal-article","created":{"date-parts":[[2023,2,11]],"date-time":"2023-02-11T01:24:17Z","timestamp":1676078657000},"page":"420-424","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["T follicular helper phenotype mycosis fungoides associated with acanthosis nigricans"],"prefix":"10.1111","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5664-2657","authenticated-orcid":false,"given":"Cristina B.","family":"Spigariolo","sequence":"first","affiliation":[{"name":"Unit of Dermatology Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico  Milan Italy"},{"name":"Department 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