【摘 要】 目的 本研究的目的是檢測胸水中SHOX2基因甲基化作為良惡性胸腔積液鑒別方法的臨床價值。方法 運用實時熒光定量PCR的方法分析亞硫酸氫鹽轉化后的胸腔積液中SHOX2基因是否存在甲基化。結果 共60例患者,其中惡性胸腔積液組28例,良性胸腔積液組19例,非肺部惡性腫瘤伴胸腔積液組13例,惡性胸腔積液組中35.7%(10/28)出現甲基化陽性,良性胸腔積液組發現甲基化為0%(0/19)。肺部惡性腫瘤組與良性組相比具有統計學差異(P<0.05)。SHOX2基因甲基化診斷肺癌的敏感性為35.7%,特異性為100%。結論 胸腔積液中沉渣細胞SHOX2基因甲基化狀態是一種有潛力的鑒別胸腔積液良惡性的輔助診斷方法。
【關鍵詞】 SHOX2基因;胸腔積液; PCR;甲基化;肺癌
【中圖分類號】 R734.2 【文獻標識碼】 B
Relations Pleural Effusion SHOX2 Gene Methylation and Lung Cancer
Li Shaofei Nie Ligong
(Department of Respiratory Medicine,Peking University First hospital,Beijing,Xicheng,100034)
【Abstract】 Objective As a pleura effusion-based assay would expand the possible applications of the SHOX2 biomarker,this study aimed to develop a modified SHOX2 assay for use in a blood-based test and to analyze the performance of this optimized SHOX2 methylation assay in pleura effusion.Methods Quantitative real-time polymerase chain reaction was used to analyze DNA methylation of SHOX2 in pleura effusion samples from 25 individuals.Results Of the 60 patients with pleural effusion,28 had a definite diagnosis of malignant pleural effusion,and 19 were confirmed to have benign pleural effusion, 13 had a definite diagnosis of malignant tumor except lung cancer.The positivity rate of SHOX2 gene methylation was 35.7%(10/28)in malignant pleural effusion and 0%(0/19) in benign pleural effusion specimens, showing a significant difference between them (P<0.05).The diagnostic sensitivity and specificity of shox2 gene in the 25 cases were 35.7% and 100%, respectively.Conclusion Detection of aberrant methylation in shox2 gene in the sediment cells of pleural effusion specimens allows differentiation between benign and malignant pleural effusion.
【Keywords】 shox2 gene;pleural effusion;PCR;methylation;lung cancer
肺癌是最常見腫瘤之一,據2010年我國第三次全國死因回顧分析顯示,我國肺癌的發病率及死亡率已躍居首位[1],成為嚴重威脅人民健康的疾病之一。肺癌以胸腔積液為首發表現者并不少見,而在胸腔積液的鑒別診斷中,良惡性胸腔積液的鑒別是十分重要的方面。影像學可以發現肺部及胸膜異常,有助于鑒別胸腔積液病因,但其敏感性及特異性均不能滿足臨床實踐的需要[2],最終需要胸腔積液細胞病理或組織病理證實。對于惡性胸腔積液,細胞病理學首次診斷敏感性為48.5%[3];閉式胸膜活檢敏感性相比胸腔積液細胞病理學并無明顯優勢;電視胸腔鏡(VATS),其診斷準確性在90%以上,而圍手術期死亡率小于0.5%,但是VATS需要全身麻醉及單肺通氣,相對禁忌癥較多[4];……