简介:AbstractBackground:Recent studies have demonstrated that microRNAs (miRNAs) in the blood circulation can serve as promising diagnostic markers for cancers. This four-stage study aimed at finding serum miRNAs as potential biomarkers for lung adenocarcinoma (LA) diagnosis.Methods:The study was carried out between 2016 and 2017. The Exiqon miRNA qPCR panel (3 LA vs. 1 normal control [NC] pooled serum samples) was used for initial screening to acquire miRNA profiles. Thirty-five dysregulated miRNAs were further evaluated in the training (24 LA vs. 24 NCs) and testing stages (110 LA vs. 110 NCs) using quantitative real-time polymerase chain reaction assays.Results:Four serum miRNAs (miR-133a-3p, miR-584-5p, miR-10b-5p, and miR-221-3p) were significantly overexpressed in LA patients compared with NCs. The diagnostic value of the four-miRNA panel was validated by an external cohort (36 LA vs. 36 NCs). The areas under the receiver operating characteristic curve of the four-miRNA panel in the training, testing, and external validation stages were 0.734, 0.803, and 0.894 respectively. Meanwhile, the expression level of miR-221-3p was much higher in LA tumor samples than that in the adjacent normal tissues (19 LA vs. 19 NCs). The expression level of miR-10b-5p was also elevated in the serum-derived exosomes samples (18 LA vs. 18 NCs). The expression of miR-133a-3p, miR-584-5p, and miR-10b-5p was significantly elevated in LA patients with epidermal growth factor receptor mutation compared with NCs.Conclusion:The study established a four-miRNA signature in serum that could improve the diagnostic capability of LA.
简介:2015年4月25日,尼泊尔博卡拉8.1级地震发生后,位于中尼边境的西藏自治区日喀则市吉隆县吉隆口岸成为一座名副其实的'生命孤岛'。丁在成是西藏公安边防总队吉隆边检站监护中队的排长。地震突发,口岸的人们慌乱奔跑,喊声、哭声混成一片,周围山体的滑坡、滚石伴着浓烟倾泻而下。他与20名战友第一时间投入救援,多次深入尼泊尔边境实施跨境救援。当口岸所有群众和工作人员在被转移
简介:目的对直肠癌miRNA表达谱进行初步研究,以期发现在直肠癌发生过程中与直肠腺瘤miRNA的差异表达谱,并预测可能受其调控的靶基因。方法选择2011年1~3月于解放军第306医院肠镜检查的直肠癌及直肠腺瘤进行检测,筛选直肠癌、直肠腺瘤组织差异表达的miRNA,并运用生物信息软件分析其靶基因。结果通过miRNAs芯片检测,发现直肠腺癌与直肠腺瘤相比,上调的miRNA34种,下调8种。预测ZFHX4可能为miR-375的靶基因,预测SMAD2等可能为miR-18a的靶基因。结论与直肠腺瘤相比,直肠腺癌有其特异的miRNA表达谱,miRNA在直肠癌的发生中可能起到重要作用。
简介:摘要目的在宫颈癌患者血清中筛选差异表达的microRNA(miRNA),寻找早期诊断宫颈癌的血清标志物。方法采集50例宫颈癌患者和30例健康妇女血清标本,提取血清中RNA,利用Microarray基因芯片方法在病例组20例和对照组20例混合血清样本中筛选差异表达的miRNA,采用实时荧光定量PCR对差异表达的miRNA验证,并绘制ROC曲线分析这些miRNA在诊断宫颈癌的价值。结果Microarray芯片检测结果显示在宫颈癌患者血清中存在miRNA差异表达,其中表达上调的5个,分别为miR-21、miR-25、miR-205、miR-486-5p和miR-148a,表达下调的2个,分别为miR-143和miR-372。实时荧光定量PCR验证筛选出的miRNA,与芯片筛选的结果一致。选取差异表达最显著的3个miRNA(miR-25、miR-205、miR-486-5p)作为诊断宫颈癌的候选标志物,其ROC曲线下面积分别为0.972、0.949和0.944,通过最佳临界值分析,其诊断宫颈癌的灵敏度和特异性分别为92%、93.3%,90%、96.7%和90.0%、90.0%。结论宫颈癌患者血清中存在miRNA表达异常,miRNA是诊断宫颈癌的潜在的血清标志物。
简介:AbstractBackground:Accumulating evidence has revealed that circulating microRNAs (miRNAs) can serve as non-invasive biomarkers for cancer diagnosis. This study aimed to identify differentially expressed miRNAs in serum which might become potential biomarkers for non-invasive diagnosis of papillary thyroid carcinoma (PTC).Methods:The experiment was carried out between 2015 and 2017. In the screening stage, the Exiqon miRNA quantitative real-time polymerase chain reaction (qPCR) panel was applied to select candidate miRNAs. In the following training, testing, and external validation stages, the serum samples of 100 patients and 96 healthy controls (HCs) were analyzed to compare the expression levels of the identified miRNAs. The areas under the receiver operating characteristic curves (AUCs) were calculated to assess the diagnostic value of the identified signature.Results:Three miRNAs (miR-25-3p, miR-296-5p, and miR-92a-3p) in serum were consistently up-regulated in PTC patients compared with HCs. A three-miRNA panel was constructed by logistic regression analysis and showed better diagnostic performance than a single miRNA for PTC detection. The AUCs of the panel were 0.727, 0.771, and 0.862 for the training, testing, and external validation stage, respectively. Meanwhile, the panel showed stable capability in differentiating PTC patients from patients with benign goiters, with an AUC as high as 0.969. For further exploration, the three identified miRNAs were analyzed in tissue samples (23 PTC vs. 23 HCs) and serum-derived exosomes samples (24 PTC vs. 24 HCs), and the altered expression in the tumor also indicated their close relationship with PTC disease.Conclusion:We identify a three-miRNA panel in serum which might serve as a promising biomarker for PTC diagnosis.