Abstract

背景与目的组织蛋白酶X(Cathepsin X, Cat X)是最近发现的一种组织蛋白酶(Cathepsins, Cats)家族成员。近年来研究表明Cat X与多种恶性肿瘤发生、发展有关。本研究旨在探讨肺癌患者血清Cat X及cystatin C的表达与临床特征及预后的关系。方法采用ELISA法定量检测84例肺癌患者及36例健康对照者血清Cat X及cystatin C表达。结果肺癌患者血清Cat X和cystatin C水平明显高于健康人(P < 0.01);Cat X水平与肺癌病理类型之间有相关的趋势(P=0.076)。血清cystatin C水平与肺癌TNM分期正相关(P=0.01),cystatin C/Cat X与淋巴结转移之间有相关趋势(P=0.058)。Cat X表达水平与肺癌患者总生存期(overall survival, OS)相关,高水平Cat X肺癌患者OS更短。Cox单因素回归示Cat X高表达以及TNM分期是影响肺癌预后独立因素,Cox多因素回归显示,仅TNM分期是患者预后的独立危险因素。结论肺癌患者中血清Cat X和cystatin C水平升高,检测肺癌患者Cat X和cystatin C血清水平对于指导临床肺癌诊断、评估预后有重要意义。

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