INCIDENCE AND TYPES OF CANINE TUMOURS IN SLOVENIA (2000-2020): A RETROSPECTIVE STUDY

We conducted a large retrospective study to establish a registry of canine tumours diagnosed in Slovenia over a 20-year period and to analyse their incidence rate and some epidemiological characteristics. In the study, we analysed the results of histopathological examinations of biopsies and samples from the necropsies of dogs submitted to the Institute of Pathology, Wild Animals, Fish and Bees of the Veterinary Faculty, University of Ljubljana between 2000 and 2020. Malignant tumours predominated (58.81%), followed by benign tumours (37.17%); 4.02% of tumours were of unspecified biological behaviour. Tumours were most frequently found in the skin and subcutaneous tissue (57.83% of all tumours), the mammary gland (14.07%) and the haemolymphatic system (6.63%). The most frequently diagnosed tumours were mast cell tumour (14.17%), mammary (adeno)carcinoma (10.02%), cutaneous histiocytoma (7.34%) and cutaneous/subcutaneous lipoma (6.92%). The incidence of tumours was higher in females (3837 tumours; 51.69%) than in males (3576 tumours; 48.17%). Tumours were most common in Golden Retrievers (4.86%), Boxers (4.72%), German Shepherds (4.66%) and Labradors (4.27%), and were the most common between age of 8 and 11 years. In 151 dogs (2.03%) multiple tumours of different types were detected at the same time. The results of our study are mostly comparable with the results of other similar studies. Incidenca in tipi tumorjev pri psih v sloveniji v obdobju 2000-2020: retrospektivna raziskava Izvleček: Namen retrospektivne raziskave je vzpostaviti register tumorjev, diagnosticiranih pri psih v Sloveniji v obdobju 20 let, ter analizirati incidenco tumorjev in nekatere njihove epidemiološke značilnosti. V raziskavi, ki smo jo opravili na Inštitutu za patologijo, divjad, ribe in čebele Veterinarske fakultete Univerze v Ljubljani med letoma 2000 in 2020, smo analizirali rezultate histopatoloških preiskav bioptov psov, ki so jih poslali kliniki, in tumorjev, odvzetih med raztelesbo psov. Malignih tumorjev je bilo več kot benignih (58,1 % vs. 37,17 %), 4,02 % tumorjev je bilo nespecificiranega biološkega obnašanja. Najpogostejši so bili tumorji kože in podkožja (57,83 % vseh tumorjev), mlečne žleze (14,07 % vseh tumorjev) ter hematopoetičnega in limfatičnega sistema (6,63 % vseh tumorjev). Najpogosteje smo diagnosticirali mastocitom (14,17 %), mamarni (adeno)karcinom (10,02 %), kožni histiocitom (7,34 %) in kožni/podkožni lipom (6,92 %). Pri 2,03 % psov smo ugotovili multiple tumorje različnih tipov. Incidenca tumorjev je bila z 51,69 % višja pri samicah kot pri samcih - 48,17 %. Tumorji so bili najpogostejši pri zlatih prinašalcih (4,86 %), bokserjih (4,72 %), nemških ovčarjih (4,66 %) in labradorcih (4,27 %), najpogosteje so bili ugotovljeni med 8. in 11. letom starosti. Rezultati naše raziskave so pretežno primerljivi z rezultati drugih podobnih raziskav. Ključne besede: pes; tumor; incidenca; starost; pasma; Slovenija