RT Journal Article SR Electronic T1 Endosialin (CD248) Expression in Fibromas and Soft-tissue Fibrosarcomas in Dogs JF In Vivo JO In Vivo FD International Institute of Anticancer Research SP 1467 OP 1472 DO 10.21873/invivo.12399 VO 35 IS 3 A1 MAGDALENA MARZEC A1 MAƁGORZATA KANDEFER-GOLA A1 IZABELA JANUS A1 JOANNA BUBAK A1 MARCIN NOWAK YR 2021 UL http://iv.iiarjournals.org/content/35/3/1467.abstract AB Background/Aim: Endosialin is present in human fibrosarcoma neoplastic cells. This study aimed to analyse the expression of selected cellular proteins found in fibrosarcomas and soft-tissue fibroids in dogs. Materials and Methods: A total of 71 skin tumours obtained from dogs were used. The samples included 31 fibromas and 40 fibrosarcomas. Histopathological evaluation was performed according to World Health Organization guidelines. Immunohistochemistry was performed with anti-endosialin, Ki-67, cyclo-oxygenase 2 and vimentin antibodies and assessed using the semi-quantitative scale. Results: Endosialin expression was observed in 82.5% of fibrosarcomas and in 35% of fibromas. A significant positive correlation was found between the expression of endosialin in fibrosarcoma neoplastic cells and the degree of histological malignancy and the expression of the Ki-67 and cyclo-oxygenase 2 antigen. Expression of vimentin confirmed the mesenchymal origin of these tumours. Conclusion: The results of our research suggest that endosialin is involved in the carcinogenesis of fibrosarcoma in dogs.