Abstract
Epidemiology of Canine Mammary Gland Tumours in Espírito Santo, Brazil
Highlights
Mammary gland tumours are very common in dogs and cats [14], representing the second most frequent tumor in dogs, and the third in cats [4]
Histopathology Histopathological sections stained with hematoxylin and eosin were reviewed by optic microscopy
The genes BRCA1 and BRCA2 are known as important risk factors for the development of breast neoplasia in humans, and they were associated with the high risk of developing mammary tumours in Cocker Spaniel [3,27,28,42], this breed was not prevalent in this study
Summary
Mammary gland tumours are very common in dogs and cats [14], representing the second most frequent tumor in dogs, and the third in cats [4] This occurrence is directly related to the reproductive status and patients age [19,14]. Necrosis was evidenced in 11.7% of malignant neoplasms and there was a weak, positive correlation between the occurrence of necrosis and ulceration (P < 0.0001; rs = 0.223), which was correlated with tumour size and histological grade Of these patients, 24.4% had metastases, and of these, 8.8% presented macroscopic abnormalities in the lymph node. Discussion: Older dogs are at higher risk of developing malignant mammary gland tumour when compared to young bitches, most neoplasms with a histopathological grade III occurred in animals older than 10 years, in agreement with the literature. The inguinal and caudal abdominal are often the most affected, as it was observed in this study; no differences were observed in the occurrence of malignant neoplasms, benign or non-neoplastic
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