<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Histopathological examination, grading, immunohistochemical staining and molecular genetic examinations are the proposed criteria that should be used for cutaneous mast cell tumors (CMCTs) classification. The presence of aberrant CD117 expression and mutations of the c-kit proto-oncogene could be an indicative parameter for final histological grading. Determination of the connection between the localization of KIT receptor expression and the histological grade of CMCTs without c-kit proto-oncogene mutations was the main goal of this study. The study included twenty four CMCTs and six control skin samples from 30 dogs of different ages, breed and sex. Formalinfixed and paraffin-embedded tissue samples were stained with hematoxylin-eosin and toluidine blue and immunohistochemically tested for CD117 expression. DNA was extracted from the same paraffin blocks and subsequent polymerase chain reaction amplification was performed using PE1 and PE2 primers. Degree of malignancy was determined based on the presence of mitotic figures, multinucleated cells, bizarre nuclei and karyomegaly in 10 high power fields. Based on histological features, fourteen of 24 CMCTs were of a high histological grade, while ten were classified as a lowgrade malignancy. CD117 cytoplasmic expression was observed in nine of fourteen high-grade malignancy CMCTs, which confirms the link between the aberrant CD117 expression and increased cell proliferation.</p></abstract>

Histopathological examination, grading, immunohistochemical staining and molecular genetic examinations are the proposed criteria that should be used for cutaneous mast cell tumors (CMCTs) classification. The presence of aberrant CD117 expression and mutations of the c-kit proto-oncogene could be an indicative parameter for final histological grading. Determination of the connection between the localization of KIT receptor expression and the histological grade of CMCTs without c-kit proto-oncogene mutations was the main goal of this study. The study included twenty four CMCTs and six control skin samples from 30 dogs of different ages, breed and sex. Formalinfixed and paraffin-embedded tissue samples were stained with hematoxylin-eosin and toluidine blue and immunohistochemically tested for CD117 expression. DNA was extracted from the same paraffin blocks and subsequent polymerase chain reaction amplification was performed using PE1 and PE2 primers. Degree of malignancy was determined based on the presence of mitotic figures, multinucleated cells, bizarre nuclei and karyomegaly in 10 high power fields. Based on histological features, fourteen of 24 CMCTs were of a high histological grade, while ten were classified as a lowgrade malignancy. CD117 cytoplasmic expression was observed in nine of fourteen high-grade malignancy CMCTs, which confirms the link between the aberrant CD117 expression and increased cell proliferation.

Kit Receptor Expression in Canine Cutaneous Mast Cell Tumors (CMCTs) Without C-Kit Mutation

Department of Pathology, Faculty of Veterinary Medicine, University of Belgrade, Bulevar oslobodjenja 18, Belgrade, Serbia

Department of Equine, Small Animal, Poultry and Wild Animal Diseases, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia

Department of Economics and Statistics, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia

Acta Veterinaria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Histopathological examination, grading, immunohistochemical staining and molecular genetic examinations are the proposed criteria that should be used for...

Kit Receptor Expression in Canine Cutaneous Mast Cell Tumors (CMCTs) Without C-Kit Mutation

Published Online: Jun 28, 2016

Page range: 222 - 233

Received: Apr 14, 2016

Accepted: May 25, 2016

DOI: https://doi.org/10.1515/acve-2016-0019

Keywords
dogs, mast cell tumor, morphology, classification, CD117

© by Ivana Vučićević

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Kit Receptor Expression in Canine Cutaneous Mast Cell Tumors (CMCTs) Without C-Kit Mutation

Published Online: Jun 28, 2016

Page range: 222 - 233

Received: Apr 14, 2016

Accepted: May 25, 2016

DOI: https://doi.org/10.1515/acve-2016-0019

Keywordsdogs, mast cell tumor, morphology, classification, CD117

© by Ivana Vučićević

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
dogs, mast cell tumor, morphology, classification, CD117