Publication: Cyclooxygenase-2 expression in retinoblastoma: An immunohistochemical analysis
Issued Date
2010-03-01
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ISSN
14602202
02713683
02713683
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2-s2.0-77950840747
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Mahidol University
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SCOPUS
Bibliographic Citation
Current Eye Research. Vol.35, No.3 (2010), 242-247
Suggested Citation
La Ongsri Atchaneeyasakul, Mongkol Uiprasertkul, Adisak Trinavarat Cyclooxygenase-2 expression in retinoblastoma: An immunohistochemical analysis. Current Eye Research. Vol.35, No.3 (2010), 242-247. doi:10.3109/02713680903477832 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/29746
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Title
Cyclooxygenase-2 expression in retinoblastoma: An immunohistochemical analysis
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Abstract
Purpose: Increased level of cyclooxygenase-2 (COX-2) plays a significant role in the pathogenesis of cancers. High expression of COX-2 has been demonstrated in several cancer types including retinoblastoma. However, the in vivo study did not confirm the anti-proliferative effect of COX-2 inhibitor, celecoxib, on a murine transgenic retinoblastoma model. We, therefore, aim to investigate COX-2 expression in paraffin-embedded retinoblastoma specimens in a larger study group. Methods: We reviewed 55 retinoblastoma specimens obtained during 1995 to 2005. Clinical and histopathological data were recorded. Immunohistochemical evaluation of COX-2 expression was performed using a rabbit monoclonal antibody to human cyclooxygenase-2. Results: Forty-four of 55 specimens (80%) showed negative immunoreactivity for COX-2 expression. For the 11 specimens (20%, 95% CI=11.6-32.4%) with positive COX-2, all immunostainings were less than 50% of tumor area. Demographic data and treatment details were available in 53 specimens. Enucleation was performed as a primary treatment in 43 specimens (81%). Other treatments, mainly systemic chemotherapy, were given prior to enucleation in 10 specimens (19%). There was no statistical difference in COX-2 expression between the specimens identified as primary and secondary enucleation (p=0.66). Regarding the histopathological findings, there were no significant differences between COX-2 negative and COX-2 positive groups. Conclusions: It appears that COX-2 is not overexpressed in our retinoblastoma specimens, which is different from previous studies. This conflicting data reduces the possibility of introducing Cox-2 inhibitors in the treatment of retinoblastoma.