Expression of Selected Markers in Immunohistochemical Diagnosis of Canine and Human Testicular Tumours

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Abstract

Immunohistochemical profiles of the most common canine testicular tumours, including the Leydig cell tumours, seminomas, and Sertoli cell tumours were analysed, and the results were compared with those obtained in the corresponding types of human testicular neoplasms. The expressions of vimentin, von Willebrand factor (FVIII), chromogranin A, synaptophysin, and MCM3 were quantified. In the case of Sertoli cell tumours, only canine ones were analysed, since this type of tumour is very rarely diagnosed in men. The expression of the analysed proteins in the testicular tumours was similar. The von Willebrand factor exhibited the strongest expression in Leydig cell tumours in dogs and men, while vimentin was expressed more strongly in dogs (96.7% had an intensity at +++) than in men (62.5% had +++) in the Leydigioma. The immunoexpression of MCM3 in seminomas was high in both men and dogs – 90% +++ and 100% +++ respectively. The lack of chromogranin A and synaptophysin was observed in almost 100% of seminomas in men and dogs. This differed from the results obtained for Leydigioma, where chromogranin A was expressed in 70% of dogs at +++ and in 100% of men at ++++. The results may indicate that the antibodies were selected correctly. Their analysis and interpretation provides valuable information concerning the nature of the studied tumours.

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