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Immunohistochemical Investigation of Cyclooxygenase-2 Expression in Rabbit Uterine Adenocarcinoma and the Potential
Emanuela Vaccaro1, Luigi Navas1, Martina Ercolano1
1Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, 80137 Naples, Italy.
Abstract:
Cyclooxygenase-2 (COX-2) is overexpressed in many human and animal cancers. Selective COX-2 inhibitors have shown antitumoral effects in tumors with a high expression of COX-2. This study evaluates (1) the expression of COX-2 in rabbit uterine adenocarcinomas, (2) the correlation between immunophenotypic expression and histopathological changes, and (3) the post-surgery response to therapy with COX-2 inhibitors. Forty rabbit uteri were divided into three groups: neoplastic, hyperplastic, and normal endometrium. A histological and immunohistochemical score was applied to investigate the tumor's grade and the COX-2 expression. By histological evaluation, 30 cases of endometrial adenocarcinoma, 5 cases of endometrial hyperplasia and 5 normal endometria were found. Of the six cases of endometrial adenocarcinoma with follow-up available, four received a post-surgical treatment with meloxicam and two were treated by surgery alone. The survival time of the animals treated with meloxicam was longer than that observed in the untreated animals. A statistically significant difference in COX-2 IHS was observed between non-neoplastic endometrium and adenocarcinoma. The progressive increase in COX-2 expression from normal epithelium to carcinoma suggests that upregulation of COX-2 expression may play a role in tumor initiation and progression. Our findings suggest the possible use of COX-2 inhibitors in treating uterine adenocarcinoma in rabbits. Further study will be needed to confirm this hypothesis.
Insights
Cyclooxygenase-2 (COX-2) is overexpressed in rabbit uterine cancers. Inhibiting COX-2 with meloxicam after surgery extended survival, suggesting its potential as a cancer therapy.
Area of Science:
- Veterinary Oncology
- Cancer Biology
Background:
- Cyclooxygenase-2 (COX-2) is frequently overexpressed in various cancers.
- Selective COX-2 inhibitors demonstrate antitumoral effects in COX-2-expressing tumors.
Purpose of the Study:
- Evaluate COX-2 expression in rabbit uterine adenocarcinomas.
- Correlate COX-2 immunophenotypic expression with histopathological changes.
- Assess the response to COX-2 inhibitors post-surgery.
Main Methods:
- Histological and immunohistochemical scoring of 40 rabbit uteri (neoplastic, hyperplastic, normal).
- Analysis of COX-2 expression in endometrial adenocarcinoma.
- Comparison of post-surgical treatment outcomes with meloxicam versus surgery alone.
Main Results:
- Identified 30 adenocarcinomas, 5 hyperplasias, and 5 normal endometria.
- Significant difference in COX-2 expression between normal endometrium and adenocarcinoma.
- Meloxicam treatment group showed longer survival than the untreated group.
Conclusions:
- Upregulation of COX-2 expression correlates with tumor progression in rabbits.
- COX-2 inhibitors like meloxicam may be a viable therapeutic option for rabbit uterine adenocarcinoma.
- Further research is warranted to confirm the therapeutic efficacy of COX-2 inhibitors.
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