环氧合酶-2在髓母细胞瘤中的表达及临床意义

目的　探讨环氧合酶 2 (COX- 2 )在髓母细胞瘤中的表达及其与预后的关系。方法　通过免疫组化方法测定 COX- 2在 5 2例人髓母细胞瘤和 10例正常小脑组织标本中的表达。并结合临床资料 ,使用 Cox比例风险模型及 Kaplan- Meier生存曲线分析患者生存时间与 COX- 2阳性表达率之间的关系。结果　 1COX- 2在 5 2例髓母细胞瘤标本中的表达 ,除 l例为阴性外 ,其余均有不同程度的阳性表达 ,并发现阳性染色主要位于肿瘤细胞 ,同时在一些肿瘤血管内皮细胞中也发现了 COX- 2的阳性表达。正常小脑组织标本中未发现 COX- 2的表达。2 Kaplan-Meier生存率曲线分析显示 COX- 2高表达 (超过 5 0 %的细胞阳性染色 )的患者生存期明显缩短 (P<0 .0 0 0 1)。结论COX- 2在大多数髓母细胞瘤中都有表达 ,并且 COX- 2在髓母细胞瘤细胞中的表达水平与患者的预后呈负相关

Expression and Clinical Significance of Cyclooxygenase-2 in Medulloblastoma

OBJECTIVE: To gain an insight into the possible relationship between the expression of cyclooxygenase-2 (COX-2) and the prognosis of the patients with medulloblastoma. METHODS: COX-2 expression was investigated in 52 medulloblastoma and 10 normal cerebellar tissue specimens by immunohistochemistry. Kaplan-Meier analyses, Log-rank test, and Cox proportional hazard model were used to explore the relationship between the percentage of COX-2 expression and the survival period of patients with medulloblastoma. RESULTS: Positive staining with COX-2 was either moderately or strongly observed in most of the medulloblastoma (51/52). Moreover, COX-2 was expressed not only in tumor cells, but also in the vascular endothelial cells of tumor. No COX-2 immunoreactivity was observed in normal cerebellar tissue. Kaplan-Meier analyses demonstrated that high COX-2 expression (> or = 50% of cells stained positive) correlated with poor survival for the study group as a whole (P < 0.0001). CONCLUSION: Our study provides evidence that COX-2 is expressed in the majority of medulloblastomas and that a potential role of COX-2 inhibitors as an adjuvant therapy for brain tumors may exist.