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The aim of this study was to determine whether MUM1 is expressed in canine peripheral T-cell lymphoma not otherwise specified (PTCL-NOS). For comparison, the presence of MUM1 antigen was also investigated in canine diffuse large B cell lymphoma (DLBCL). Nine cases of PTCL-NOS and 9 cases of DLBCL diagnosed by a commercial veterinary diagnostic laboratory were selected. Positive immunohistochemical labeling for MUM1 was observed in PTCL-NOS (2 out of 9 cases) and DLBCL (3 out of 9 cases). These findings suggest that a subset of neoplastic T and B lymphocytes can express MUM1. The role of MUM1 in the biological behavior and outcome of canine lymphoma (CL) requires further investigation on a larger number of cases.<\/jats:p>","DOI":"10.1177\/03009858231155401","type":"journal-article","created":{"date-parts":[[2023,2,18]],"date-time":"2023-02-18T01:51:55Z","timestamp":1676685115000},"page":"316-319","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":13,"title":["MUM-1 in canine lymphoma: A pilot study"],"prefix":"10.1177","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3873-390X","authenticated-orcid":false,"given":"Elena","family":"Riccardi","sequence":"first","affiliation":[{"name":"IDEXX Laboratories Ltd., Wetherby, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6308-0568","authenticated-orcid":false,"given":"Robert","family":"Klopfleish","sequence":"additional","affiliation":[{"name":"Freie Universit\u00e4t Berlin, 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