B7-H1蛋白在人胰腺癌组织中的表达及临床意义

背景与目的：恶性肿瘤细胞表达共刺激分子B7-H1来抑制T细胞功能,逃避机体的抗肿瘤免疫反应。本研究通过检测人胰腺癌组织中B7-H1蛋白的表达,探讨其与胰腺癌患者临床病理指标及预后之间的关系。方法：采用免疫组化法检测B7-H1在40例胰腺癌组织和10例癌旁正常胰腺组织中的表达情况,用卡方检验或确切概率法分析B7-H1的表达与胰腺癌患者各临床病理指标以及生存时间的关系。结果：40例胰腺癌组织中B7-H1阳性率为45.00%（18/40）,高于癌旁正常胰腺组织（P〈0.05）;B7-H1表达与患者肿瘤分期、术前CA19-9有关（P〈0.05）。多因素Cox回归模型显示,B7-H1表达是胰腺癌患者无复发生存期、总生存期的独立危险因素。结论：人胰腺癌组织中存在B7-H1蛋白表达,B7-H1表达与胰腺癌患者的预后有关。

Expression of B7-H1 protein in human pancreatic carcinoma tissues and its clinical significance

Background and Objective. B7-H1, a member of B7 family, is expressed in tumor cells and has emerged as an important immune modulator capable of suppressing host immunity by inhibiting T cells function. This study was to probe into the correlation between the expression level of B7-H1 protein in pancreatic carcinoma tissues and clinicopathological characteristics and prognosis. Methods： The expression of B7-H1 was measured in 40 cases of pancreatic carcinoma tissues and 10 cases of normal corresponding paracarcinoma tissues by immunohistochemistry. The relationship between the expression level of B7-H1 and clinicopathological characteristics and survival was analyzed. Results; The positive rate of B7-H1 was significantly higher in the tumor tissues 45.00% （18/40）] than in the normal corresponding paracarcinoma tissues 0（0/10） ] （P〈0.05） ; moreover, B7-H1 expression was significantly associated with the staging of tumor and preoperative serum CA19-9 level （P〈0.05）. The multivariate cox proportional hazards regression analysis of prognostic factors for overall survival and relapse-free survival showed that the expression of B7-H1 was an independent factor for poor prognosis. Conclusion： B7-H1 protein was expressed in human pancreatic carcinoma tissues, and was associated with the prognosis.