NPTX1在胸腺瘤患者中的表达及诊断价值

Expression and Diagnostic Value of NPTX1 in Thymoma Patients

背景与目的胸腺瘤是原发于前纵隔最常见的恶性肿瘤,但对于胸腺瘤的诊断没有特异性的实验室指标。本研究旨在通过mRNA微阵列分析技术筛选出对胸腺瘤诊断有提示作用的肿瘤标志物,并加以证实。方法前期对31份胸腺瘤和瘤旁胸腺组织进行mRNA微阵列分析,发现胸腺瘤中神经细胞正五聚体1(neuronal pentraxin 1,NPTX1)基因转录水平上调超过4倍。为进一步验证上述结果,采用实时荧光定量聚合酶链反应(polymerasechain reaction,PCR)法、免疫组化法和酶联免疫吸附测定法(enzyme-linkedimmunosorbentassay,ELISA)对60例胸腺瘤患者和30例胸腺囊肿患者NPTX1基因的转录和表达水平进行检测,并应用受试者工作特征曲线(receiver operating characteristic curve, ROC)分析其在胸腺瘤中的诊断价值。结果胸腺瘤组织中NPTX1 mRNA转录水平明显高于对照组胸腺组织[(2.88±1.02) vs (1.35±0.47), P<0.001];胸腺瘤组织中NPTX1蛋白的表达水平明显高于对照组胸腺组织(2 vs 1, P<0.001);术前胸腺瘤患者血清中NPTX1蛋白含量明显高于对照组胸腺囊肿患者[(1,018.29±209.38) pg/mL vs(759.95±66.02)pg/mL,P<0.001];血清中NPTX1蛋白含量以842.22pg/mL为诊断节点,诊断胸腺瘤的敏感性为85.00%,特异性为93.33%,ROC曲线下面积为0.902。结论 NPTX1在胸腺瘤患者中高表达,且对胸腺瘤有诊断价值。

Background and objective Thymomas are the most common primary malignant tumors of anterior mediastinal. However, there are no specific laboratory indicator for the diagnosis the diagnosis of thymoma. The aim of this study was to screen out a tumor marker for diagnosis of thymoma by mRNA microarray analysis and confirmed it. Methods By mRNA microarray analysis of 31 thymomas and peritumoral thymic tissues, we found that the transcription level of neuronal pentraxin 1(NPTX1) gene was up-regulated more than 4 times in thymomas. To further verify the above results, we detected the transcription and expression level of NPTX1 in 60 thymoma and 30 thymic cyst patients by quantitative Real-Time polymerase chain reaction(PCR), immunohistochemistry and enzyme-linked immunosorbent assay(ELISA). Furthermore, the diagnostic value of NPTX1 in thymoma by receiver operating characteristic curve(ROC) was analyzed. Results The transcription level of NPTX1 mRNA in thymoma tissues was significantly higher than that in the thymic tissues of control group [(2.88±1.02) vs(1.35±0.47), P<0.001);The expression level of NPTX1 in thymoma tissues was significantly higher than that in the thymic tissues of control group(2 vs 1, P<0.001);The preoperative serum level of NPTX1 protein in thymoma patients were significantly higher than that in the thymic cyst patients of control group [(1,018.29±209.38) pg/mL vs(759.95±66.02) pg/mL, P<0.001];At the threshold of 842.22 pg/mL, sensitivity and specificity of NPTX1 as a serologic marker were 85.00% and 93.33%, respectively for thymoma. ROC showed that the area the under curve(AUC) of NPTX1 was 0.902. Conclusion NPTX1 was highly expressed in thymoma patients, and had diagnostic value for thymoma.