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Concurrent expression of cyclo-oxygenase-2 and epidermal growth factor receptor in canine malignant mammary tumours.

J. Comp. Pathol.2014 Jan;150(1):27-34. Epub 2013 Sep 21
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摘要


Canine mammary tumours (CMTs) are reported to express cyclo-oxygenase (COX)-2 and epidermal growth factor receptor (EGFR); however, no studies have evaluated concurrent expression of these proteins. In this study, 43 malignant CMTs were evaluated immunohistochemically for concurrent expression of COX-2 and EGFR and expression was correlated with malignancy. High COX-2 expression was associated with tumour size (P = 0.033), mitotic index (P = 0.040), nuclear grade (P = 0.021), histological grade of malignancy (P = 0.020) and lymph node metastasis (P = 0.029). High EGFR immunoreactivity was associated with tumour size (P = 0.001), necrosis (P = 0.001), mitotic index (P = 0.022), histological grade of malignancy (P = 0.041) and lymph node metastasis (P = 0.005). Simultaneous high-expression of COX-2 and EGFR was associated with high-nuclear grade (P = 0.049), high-histological grade of malignancy (P = 0.031) and the presence of lymph node metastasis (P = 0.025). A positive correlation between COX-2 and EGFR expression (r = 0.474; P = 0.001) was also observed. These results suggest that combined use of selective inhibitors of COX-2 and EGFR may be a useful approach to the treatment of malignant CMTs.

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