摘要
Abstract
Objective To investigate the value of methylation levels of Discs large-associated protein5(DLGAP5)and Ras association domain family 1A(RASSF1A)in peripheral blood in the differential diagnosis of benign and malignant lung nodules.Methods 110 patients with pulmonary nodules admitted to the Seventh People's Hospital of Hebei Province from December 2022 to June 2024 were selected as study subjects.Based on the diagnosis confirmed by pathological examination,52 patients with malignant lung nodules were included in the malignant group and 58 patients with benign lung nodules were included in the benign group.The methylation levels of DLGAP5 and RASSF1A genes in peripheral blood were determined by quantitative real-time polymerase chain reaction(qRT-PCR).The diagnostic value of methylation of DLGAP5 and RASSF1A genes in peripheral blood on the benign and malignant nature of lung nodules and their relationship with clinicopathological characteristics of patients with malignant lung nodules were analyzed.Spearman's method was used to analyze the correlation between DLGAP5 and RASSF1A gene methylation levels and clinicopathological features.Results Compared with the benign group,the methylation levels of DLGAP5 and RASSF1A genes were higher in the peripheral blood of patients in the malignant group,and the differences were statistically significant(χ2=27.010,24.350,all P<0.001).The sensitivities of DLGAP5 methylation and RASSF1A methylation alone in the detection of malignant lung nodules were 61.54%,67.31%,and the specificity were 86.21%,79.31%,and the accuracies were 74.55%,73.63%,respectively.The sensitivity(84.62%)and accuracy(83.64%)of the combined two-gene methylation test for malignant lung nodules were better than that of single gene methylation(Z=2.816,2.497,all P<0.05).The concordance Kappa values of DLGAP5 methylation and RASSF1A methylation alone and in combination with the pathological results were 0.583,0.569 and 0.712,respectively.The nodules size,histological differentiation degree,lymph nodes and spiculation sign of patients with malignant pulmonary nodules were correlated with DLGAP5 and RASSF1A methylation levels,and the differences were statistically significant(χ2DLGAP5=4.644～14.981,χ2RASSF1A=4.293～12.629,all P<0.05).Correlation analysis showed that the methylation levels of DLGAP5 and RASSF1A genes were positively correlated with nodule size,histologic differentiation,lymph node metastasis and spiculation sign(rDLGAP5=0.512～0.683,rRASSF1A=0.527～0.691,all P<0.05).Conclusion The methylation levels of DLGAP5 and RASSF1A gene in peripheral blood were closely related to histological differentiation,lymph node metastasis and clinical staging.The combined detection of the two has high diagnostic value fro the benign and malignant nature of pulmonary nodules.关键词
肺结节/良恶性鉴别/Discs大同源物相关蛋白5/Ras相关区域家族蛋白1AKey words
lung nodule/benign-malignant differentiation/disks large-associated purotein 5/RAS association domain family 1A分类
临床医学
