唾液与血浆微小RNA-21对早期食管癌的诊断价值

Diagnostic values of salivary versus and plasma microRNA-21 for early esophageal cancer

目的研究唾液与血浆微小RNA(miR)-21对早期食管癌的诊断价值并作对比。方法收集50例Ⅰ期和50例Ⅱ期食管癌患者和50例正常对照组的唾液、血浆标本并进行总RNA抽提行qPCR定量检测miR-21,计算miR-21在唾液与血浆的相对表达量,并分析两者对Ⅰ期、Ⅱ期和Ⅰ期+Ⅱ期食管癌的诊断价值。结果唾液和血浆miR-21表达水平在Ⅰ期、Ⅱ期和Ⅰ期+Ⅱ期食管癌患者中显著高于正常对照组,血浆miR-21诊断Ⅰ期、Ⅱ期和Ⅰ期+Ⅱ期食管癌的敏感性分别为96%、64%和97%,特异性分别为44%、84%和56%;唾液miR-21诊断敏感性分别为90%、88%和89%,特异性均为64%。不论分期如何,两者表达水平显著正相关,诊断价值的差异性没有统计学意义。结论唾液、血浆miR-21均是食管癌诊断的敏感性标志物;检测miR-21在唾液中的表达以诊断食管癌有望代替血浆检测。

Objective To evaluate the diagnostic value of salivary and plasma miR-21 in patients with esophageal cancer （EC）. Methods Total RNA was extracted from saliva and plasma samples from 50 stage I and 50 stage II patients with EC and 50 healthy controls for measurement of miR-21 levels using qPCR. The diagnostic values of salivary and plasma miR-21 levels were assessed for stage I, stage II, and stage I＋II EC. Results Salivary and plasma miR-21 were significantly higher in the EC patients than in the control group. The diagnostic sensitivities of plasma miR-21 for stage I, stage II, and stage I＋II EC were 96%, 64%and 97%, with specificities of 44%, 84%, and 56%, respectively;the sensitivities of salivary miR-21 were 90%, 88%, and 89%, respectively, with the same specificities of 64%. Regardless of EC staging, the expression of plasma miR-21 showed a significant positive correlation with that of salivary miR-21, and their diagnostic values were comparable. Conclusion Both salivary and plasmatic miR-21 can be sensitive biomarkers for EC, and salivary miR-21 detection has the potential to replace plasma detection for EC diagnosis.