Cyclooxygenase -2 expression and antitumor activity of piroxicam in canine primary renal tumors

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  • 犬の原発性腎臓腫瘍におけるシクロオキシゲナーゼ(COX)–2の発現性およびピロキシカムの抗腫瘍効果の検討
  • イヌ ノ ゲンパツセイ ジンゾウ シュヨウ ニ オケル シクロオキシゲナーゼ(COX)-2 ノ ハツゲンセイ オヨビ ピロキシカム ノ コウシュヨウ コウカ ノ ケントウ

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The antitumor activity of piroxicam and cyclooxygenase (COX)-2 expression was investigated in dogs with primary renal tumor. By immunohistochemistry, COX-2 was expressed in 42.9% (6/14) of the tumors examined. All of the tumors with positive COX-2 staining were epithelial in origin (renal adenocarcinoma and transitional cell carcinoma), and COX-2 expression was also confirmed in metastatic tumors. COX-2 was not expressed in mesenchymal and embryonic tumors. Among dogs that were not surgically treated, those treated with piroxicam (3/8) had a significantly longer median survival than those untreated (5/8). Among dogs that had metastasis at the time of first presentation, the median survival was significantly longer in dogs treated with piroxicam (8/16) than those without (8/16). Tumor shrinkage at both primary and metastatic sites was confirmed in one dog treated with piroxicam alone. These results suggest possible antitumor activities of piroxicam in canine primary renal tumors.

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