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MCC may occur concurrently with squamous cell carcinoma, Bowen disease, and\/or basal cell carcinoma (BCC), with some evidence that MCCs which occur in conjunction with other neoplasms exhibit different immunophenotypes compared to pure MCC cases. We present a case of CK20\u2010\/TTF\u20101+ MCC concurrent with Bowen disease and BCC, and discuss possible differences in the pathogenesis of pure vs combined MCC. We also review the literature for this unusual immunophenotype, noting that most cases occur in combined MCC.<\/jats:p>","DOI":"10.1111\/cup.13698","type":"journal-article","created":{"date-parts":[[2020,4,3]],"date-time":"2020-04-03T16:32:06Z","timestamp":1585931526000},"page":"764-767","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Triple collision tumor comprising Merkel cell carcinoma with an unusual immunophenotype, squamous cell carcinoma <scp>in situ<\/scp>, and basal cell carcinoma"],"prefix":"10.1111","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1594-0797","authenticated-orcid":false,"given":"Misty M.","family":"Hobbs","sequence":"first","affiliation":[{"name":"University of Kentucky College of Medicine  Lexington Kentucky USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tyler E.","family":"Geers","sequence":"additional","affiliation":[{"name":"Division of Dermatology University of Louisville School of Medicine  Louisville Kentucky USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timothy S.","family":"Brown","sequence":"additional","affiliation":[{"name":"Division of Dermatology University of Louisville School of Medicine  Louisville Kentucky USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3747-5435","authenticated-orcid":false,"given":"Janine C.","family":"Malone","sequence":"additional","affiliation":[{"name":"Division of Dermatology University of Louisville School of Medicine  Louisville Kentucky USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,5,13]]},"reference":[{"key":"e_1_2_5_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jaad.2017.12.001"},{"key":"e_1_2_5_3_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0560.2000.027003118.x"},{"key":"e_1_2_5_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/modpathol.2015.154"},{"key":"e_1_2_5_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jaad.2015.08.041"},{"key":"e_1_2_5_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/1346-8138.12808"},{"key":"e_1_2_5_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jdermsci.2011.06.011"},{"key":"e_1_2_5_8_1","doi-asserted-by":"publisher","DOI":"10.1097\/DAD.0000000000001432"},{"key":"e_1_2_5_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/cup.12176"},{"key":"e_1_2_5_10_1","doi-asserted-by":"publisher","DOI":"10.1097\/DAD.0b013e3182545e27"},{"key":"e_1_2_5_11_1","doi-asserted-by":"publisher","DOI":"10.1097\/00000372-199712000-00011"},{"key":"e_1_2_5_12_1","doi-asserted-by":"publisher","DOI":"10.4103\/ijd.IJD_608_16"},{"key":"e_1_2_5_13_1","doi-asserted-by":"publisher","DOI":"10.1097\/DAD.0000000000000124"},{"key":"e_1_2_5_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/cup.12289"}],"container-title":["Journal of Cutaneous Pathology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Fcup.13698","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/cup.13698","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1111\/cup.13698","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/cup.13698","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,5]],"date-time":"2023-09-05T08:32:15Z","timestamp":1693902735000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/cup.13698"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,5,13]]},"references-count":13,"journal-issue":{"issue":"8","published-print":{"date-parts":[[2020,8]]}},"alternative-id":["10.1111\/cup.13698"],"URL":"https:\/\/doi.org\/10.1111\/cup.13698","archive":["Portico"],"relation":{},"ISSN":["0303-6987","1600-0560"],"issn-type":[{"value":"0303-6987","type":"print"},{"value":"1600-0560","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,5,13]]},"assertion":[{"value":"2019-10-27","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2020-03-15","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2020-05-13","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}