Szarvas Tibor, Jäger Tobias, Droste Falk, Becker Markus, Kovalszky Ilona, Romics Imre, Ergün Süleyman, Rübben Herbert
Experimental Urology, Department of Urology, University of Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany.
Pathol Oncol Res. 2009 Jun;15(2):193-201. doi: 10.1007/s12253-008-9107-z. Epub 2008 Sep 20.
Angiogenesis plays a critical role in tumor growth. VEGF, angiopoietins (Ang-1, Ang-2) and their tyrosine kinase receptor Tie2 are major regulators of angiogenesis. The aim of this study was to evaluate the prognostic value of the serum levels of these factors in bladder cancer. We analyzed the serum samples of 117 bladder cancer patients and 64 healthy volunteers by enzyme linked immunosorbent assay (ELISA) for Ang-1, Ang-2, VEGF and the extracellular domain of Tie2. The statistical evaluation of the obtained data was performed via Kaplan-Meier log-rank test, univariate Cox analyses as well as Cox proportional hazards regression model. Serum Ang-1 levels of bladder cancer patients were significantly higher (p < 0.001), while soluble Ang-2 and Tie2 levels were significantly lower (p = 0.016 and p = 0.001 respectively) in patients than those in controls. Cox univariate analysis revealed high sTie2 serum level as a risk factor for metastasis and as a borderline significant risk factor for disease related death (p = 0.022 and p = 0.081 respectively). These correlations were independent from tumor stage and grade in a Cox multivariate model (p = 0.016 and p = 0.069). These data indicate that the serum levels of analyzed angiogenic factors do change characteristically in bladder cancer. The soluble extracellular serum level of Tie2 may provide a stage and grade independent diagnostic tool to select a high risk group of bladder cancer patients.
血管生成在肿瘤生长中起着关键作用。血管内皮生长因子(VEGF)、血管生成素(Ang-1、Ang-2)及其酪氨酸激酶受体Tie2是血管生成的主要调节因子。本研究旨在评估这些因子的血清水平在膀胱癌中的预后价值。我们通过酶联免疫吸附测定(ELISA)分析了117例膀胱癌患者和64名健康志愿者的血清样本,检测其中Ang-1、Ang-2、VEGF和Tie2的细胞外结构域。通过Kaplan-Meier对数秩检验、单因素Cox分析以及Cox比例风险回归模型对所得数据进行统计学评估。膀胱癌患者的血清Ang-1水平显著更高(p < 0.001),而可溶性Ang-2和Tie2水平在患者中显著低于对照组(分别为p = 0.016和p = 0.001)。Cox单因素分析显示,高sTie2血清水平是转移的危险因素,也是疾病相关死亡的临界显著危险因素(分别为p = 0.022和p = 0.081)。在Cox多变量模型中,这些相关性独立于肿瘤分期和分级(p = 0.016和p = 0.069)。这些数据表明,所分析的血管生成因子的血清水平在膀胱癌中确实有特征性变化。Tie2的可溶性细胞外血清水平可能提供一种独立于分期和分级的诊断工具,以筛选出膀胱癌高危患者群体。