Expression of Cox-1 and Cox-2 in canine mammary tumours

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Queiroga, FL (Author) Other; Alves, A (Author) Other; Pires, I (Author) Other; Lopes, C (Author) ICBAS

Journal

Title: Journal of Comparative Pathology

Vol. 136

Pages: 177-185

ISSN: 0021-9975

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 43 Citations

Scopus - 55 Citations

Other information

Authenticus ID: P-004-C1C

DOI: 10.1016/j.jcpa.2007.01.010

Abstract (EN): The aim of this study was to investigate immunohistochemically the expression of cyclooxygenase-1 (Cox-1) and cyclooxygenase-2 (Cox-2) in canine mammary tumours of different histological types. Cox-1 and Cox-2 enzyme expression was evaluated in 70 mammary samples (four normal, six hyperplastic, 60 neoplastic [21 benign and 39 malignant]). Cox-1 expression was identified in all the samples, and Cox-2 in all the mammary lesions except ductal hyperplasia. Two of the four normal mammary gland samples showed focal immunoreactivity for Cox-2. Cox-1 immunoexpression did not differ significantly between benign and malignant lesions (P = 0.272). Cox-2 immunoexpression was higher in malignant tumours than in benign counterparts (P < 0.001). Of the malignant tumours, carcinosarcomas and tubulopapillary and squamous cell carcinomas had the highest Cox-2 scores. The study showed that malignant tumours had the highest values of Cox-2 expression, and Cox-2 immunolabelling was particularly intense in histological types classically associated with high malignancy. This suggests that nonsteroidal anti-inflammatory drugs (NSAIDs), particularly Cox-2 inhibitors, may have a useful role to play in the treatment of canine malignant mammary tumours.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9