Vural, Sevil AtalayHaziroglu, RifkiVural, Mehmet R.Polat, Ibrahim M.Tunc, Arda S.2020-06-252020-06-252018Atalay Vural S, Haziroglu R, Vural MR, Polat IM, Tunc AS. Detection of progressive and regressive phase and LINE-1 retrotransposon in transfected dogs with transmissible venereal tumor during chemotherapy. J Vet Sci. 2018 Sep;19(5):620-626.1229-845X1976-555Xhttps://doi.org/10.4142/jvs.2018.19.5.620https://hdl.handle.net/20.500.12587/7323Canine transmissible venereal tumor (CTVT) is a tumor that commonly occurs in genital and extragenital sites of both genders. Long interspersed nuclear elements (LINE-1) retrotransposon has a pivotal role in allogenic transfection among uncontrolled dog populations. This study aimed to perform pathomorphological, immunohistochemical, and in situ polymerase chain reaction (PCR) evaluation of CTVT (n = 18) in transfected dogs during chemotherapy. Immunohistochemically, tumor phases were investigated by using specific markers (CD3, CD4, CD8, CD79, and transforming growth factor beta [TGF-beta]), and investigated an amplified specific sequence of TVT LINE-1 retrotransposon by in situ PCR. Polyhedral-shaped neoplastic cells that had large, round, hypo/hyperchromatic nuclei and eosinophilic cytoplasm were detected. All marker results were positive, especially in the early weeks of recovery. CD4 and TGF-beta markers were conspicuously positive at the initial stage. In situ PCR LINE-1 sequence was initially positive in only four cases. It is believed that the CD and TGF-beta markers provide phase identification at tumor initiation and during chemotherapy. It is thought that presence of T and B lymphocytes, which have roles in cellular and humoral immunity, is needed so that regression of the tumor is possible.eninfo:eu-repo/semantics/openAccessantineoplastic agentimmunohistochemistrylong interspersed nuclear element-1venereal tumorsArticle19562062610.4142/jvs.2018.19.5.6202-s2.0-8505476022030041285Q1WOS:000445944700005Q2