{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T18:10:24Z","timestamp":1778091024206,"version":"3.51.4"},"reference-count":26,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2023,8,22]],"date-time":"2023-08-22T00:00:00Z","timestamp":1692662400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Cutan Pathol"],"published-print":{"date-parts":[[2023,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The <jats:italic>NONO::TFE3<\/jats:italic> fusion has been described in MiT family translocation renal cell carcinomas as well as extracutaneous perivascular epithelioid cell tumors (PEComas). PEComas are known to express myogenic and melanocytic markers but SOX10 and p63 positivity has never been reported. We report two primary cutaneous tumors that morphologically and molecularly fit PEComas, both harboring the <jats:italic>NONO::TFE3<\/jats:italic> fusion, but with an unusual immunophenotype of SOX10 and p63 positivity. One case was on an 80\u2010year\u2010old male's finger, and the other one was on a 72\u2010year\u2010old female's thigh. Both were well\u2010circumscribed multinodular dermal tumors composed of nests of monotonous epithelioid to spindled cells with pale to vacuolated cytoplasm, some of which were arranged around blood vessels. Both tumors were positive for SOX10, S100, and p63, focally positive for Melan\u2010A, and negative for myogenic markers. There are very little data regarding the molecular findings of primary cutaneous PEComas. While the <jats:italic>NONO::TFE3<\/jats:italic> fusion has been identified in extracutaneous PEComas, it has never been reported in primary cutaneous cases. We believe these cases represent a previously undescribed subtype of cutaneous tumor which shows some immunophenotypic expression of melanocytic markers and we named these cases <jats:italic>NONO::TFE3<\/jats:italic> fusion cutaneous epithelioid and spindle cell tumor. Further, we raise the question of whether this tumor should fall under the rubric of PEComa because of its morphology, partial expression of melanocytic markers, and the presence of the <jats:italic>NONO::TFE3<\/jats:italic> fusion, or whether these tumors represent a separate novel class of tumors since the immunophenotypic expression of SOX10 and p63 is unusual for PEComas.<\/jats:p>","DOI":"10.1111\/cup.14518","type":"journal-article","created":{"date-parts":[[2023,8,22]],"date-time":"2023-08-22T12:58:27Z","timestamp":1692709107000},"page":"956-962","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["<i>NONO::TFE3<\/i> fusion cutaneous epithelioid and spindle cell tumor: A case series"],"prefix":"10.1111","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4365-9967","authenticated-orcid":false,"given":"Sharlene Helene C.","family":"See","sequence":"first","affiliation":[{"name":"Department of 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