miRNA-141在结肠癌患者血浆及肿瘤组织中的表达及意义

目的:探讨miRNA-141(miR-141)在结肠癌患者血浆及组织中的表达及意义。方法:选取89例行手术切除的结肠癌患者和60例健康志愿者,利用实时荧光定量PCR技术检测所有研究对象血清及肿瘤组织和癌旁组织中miR-141表达,分析miR-141在血清及肿瘤组织中的表达与临床病理特征之间的相关性。结果:miR-141在结肠癌患者血清中相对表达量(5.97±1.38),显著高于正常对照组(2.13±0.92);miR-141在结肠癌组织中相对表达量(3.64±1.05),显著高于癌旁组织的(1.12±0.67),差异均有统计学意义(P0.001);miR-141在结肠癌患者血清中的相对表达量与浸润程度、分化程度、淋巴结转移、远处转移、TNM分期和癌胚抗原水平有关(P0.05),miR-141在结肠癌组织中的相对表达量与浸润程度、分化程度、淋巴结转移和TNM分期有关(P0.05);Pearson相关分析显示,miR-141在结肠癌患者血清中的相对表达量与在肿瘤组织中的相对表达量呈正相关(r=0.345,P=0.001)。结论:miR-141在结肠癌患者血清及肿瘤组织中均呈高表达,可能作为癌基因参与结肠癌发生、进展及转移过程,有望成为结肠癌早期诊断的指标及基因治疗的新的靶位。     

大肠癌组织中miRNA-21 表达水平及其与预后的研究

目的：探讨miRNA-21在大肠癌中的表达及其意义。 方法：检测90例大肠癌患者肿瘤组织以及癌旁组织中miRNA-21的表达水平,并对其表达水平与临床预后的关系进行分析。 结果：miRNA-21在肿瘤组织中表达量明显升高,（P<0.05）;miRNA-21在直径>6 cm的肿瘤中的表达水平显著高于<6 cm者;在>70岁的肿瘤患者中的表达水平明显高于<70岁者（P<0.05）。miRNA-21的高表达与生存期下降密切相关（HR=2.416, 95% CI：1.314~4.445, P=0.005）,而miRNA-21低表达的患者其生存期显著上升(HR=2.100, 95% CI：1.157~3.813, P=0.015),特别是TNM1期和2期的患者。 结论：检测miRNA-21的表达对大肠癌诊断及预后的判断有临床意义。     

结肠癌组织中微小RNA分子组学分析

目的 检测结肠癌组织与癌旁组织中微小RNA（miRNA）的差异表达.方法 采用实时荧光定量PCR法检测20例结肠癌组织与癌旁组织miRNA分子的差异表达,筛选具有显著差异表达（变化倍数大于2.4且P＜0.01）的miRNA,进一步通过聚类分析不同miRNA之间的聚集性.并分析miRNA与其他结肠癌相关蛋白表达的相关性.结果 17个miRNA分子在结肠癌组织中显著下调.聚类分析显示,其中miR763-3、miR451和miR99a表达相近.血浆CK20水平与miR100（r=-0.948）、miR125a-5p（r=-0.948）、miR125b（r=-0.949）、miR145 （r=-0.949）和miR145＊ （r=-0.949）均呈高度负相关（均P＜0.05）.结论 miR145等17种miRNA可作为结直肠诊断的分子标记物;miR100、miR125a-5p、miR125b、miR145和miR145＊可能成为提示结肠癌淋巴转移的分子标志物。     

膀胱癌组织中miRNA-720、miRNA-191差异表达的意义

目的 探讨miRNA-720、miRNA-191在膀胱癌中差异表达的意义。方法 取手术切除的24例新鲜膀胱癌组织（T1~4）及12例前列腺增生患者膀胱组织保存于液氮中,Trizol试剂提取总RNA,NanoDrop 2000及变性琼脂糖凝胶电泳进行RNA检测,用标记酶Hy3TM荧光基团标记RNA的探针和miRCURYTM芯片杂交,GenePix 4000B芯片扫描仪及GenePix pro V6.0进行图像采集和数据分析,对差异表达的miRNA进行检测,实时定量逆转录PCR（qRT-PCR）对部分差异表达的miRNA进行验证。结果 与正常膀胱黏膜组织比较,非浸润性膀胱癌组织中有77个miRNA表达增加,72个表达降低;浸润性膀胱癌组织中有42个miRNA表达增加,104个表达降低。qRT-PCR检测证实miRNA-720和miRNA-191的表达水平与基因芯片结果一致。结论 非浸润性和浸润性膀胱癌组织中miRNA的差异表达普遍存在,miRNA-720可以作为膀胱癌检测的一个组织标志物,而miRNA-191在浸润性膀胱癌中的表达水平较非浸润性膀胱癌低（P〈0.05）,可作为膀胱癌是否浸润肌层的一个组织标志物。     

结肠癌中hTERT的表达及其与Survivin和bcl-2表达的关系

目的：研究端粒酶逆转录酶（hTERT）在结肠癌中的表达及其与Survivin和bcl-2表达的关系。方法：应用免疫组织化学SABC法检测52例结肠癌及其相应癌旁正常组织中hTERT、Survivin和bcl-2的表达。结果：52例结肠癌组织中hTERT表达阳性率为80.8%,而相应癌旁正常结肠组织中无一例阳性表达。hTERT表达的上调与患者性别、年龄、肿瘤浸润深度无明显相关（P〉0.05）,而与肿瘤分化程度、淋巴结转移、Dukes分期明显相关（P〈0.05）。在52例结肠癌组织中hTERT与Survivin以及hTERT与bcl-2的表达之间呈正相关（r=0.589,P〈0.05;r=0.559,P〈0.05）。结论：hTERT表达的上调与结肠癌的发生、发展、恶性程度有着密切的关系;结肠癌中hTERT的表达与Survivin和bcl-2的表达密切相关。     

长链非编码RNA GAS8-AS1与微小RNA 135b在肝细胞癌中的表达及临床意义

背景和目的：大量研究表明,长链非编码RNA (lncRNA)与微小RNA (miRNA)及其靶基因之间内源性竞争的调控模式与恶性肿瘤的发生发展密切相关。笔者团队前期通过软件预测发现,lncRNA GAS8-AS1和miR-135b之间存在结合位点,但两者在肝细胞癌（HCC）中是否存在竞争关系及其作用尚不清楚。因此,本研究探讨lncRNA GAS8-AS1和miR-135b在HCC组织中的表达及其临床意义。方法：收集2017年2月—2019年2月在青海大学附属医院行手术切除的110例HCC患者的癌组织及癌旁组织标本,通过qRT-PCR检测lncRNA GAS8-AS1和miR-135b的表达,分析两者与患者临床病理特征及预后的关系。结果：lncRNA GAS8-AS1在HCC组织中的表达明显低于癌旁组织,而miR-135b在HCC组织中的表达明显高于癌旁组织（均P<0.05）。两者的表达水平均与HCC患者的Edmondson分期、TNM分期、分化程度及淋巴结转移情况有关（均P<0.05）。lncRNA GAS8-AS1低表达患者与miR-135b高表达患者的3年总生存率分别明...     

微小RNA-92a在结直肠癌患者血清、肿瘤组织和粪便中的表达及其临床意义

目的分析血清、肿瘤组织和粪便样本中微小RNA(miRNA, miR)-92a在结直肠癌患者中的表达及意义。方法选取45例结直肠癌患者作为实验组, 同期45例健康体检人群为对照组, 分别检测两组血清、肿瘤与癌旁组织、粪便样本中miR-92a的表达量, 通过实时定量反转录聚合酶链反应(RT-qPCR)定量, 对表达量结果进行差异统计学分析, 临床特征与肿瘤样本的表达量的分析, 临床特征与miRNA表达量相关性。结果 miR-92a在肿瘤组与正常对照对比表达有统计学意义, 肿瘤组表达均高于正常组, 其中肿瘤组织中的miRNA表达量明显高于血液和粪便(血液样本中:t=28.88, P<0.001, 肿瘤组织样本:t=22.78, P<0.001, 粪便样本:t=15.97, P<0.001)。血清、肿瘤组织与淋巴结转移、浸润深度、TNM分期和分化程度表达呈正相关, 粪便样本仅与分化程度正相关, 血液样本比淋巴结转移(r=0.674), 血液样本比TMN分期(r=0.691), 血液样本比浸润深度(r=0.715), 血液样本比分化程度(r=0.648), 肿瘤组织比淋巴结转移...     

LSD1、E-钙黏蛋白、N-钙黏蛋白在结肠癌中的表达及其意义

目的：探讨赖氨酸特异性组蛋白去甲基化酶1（LSD1）、E-钙黏蛋白（E-cad）、N-钙黏蛋白（N-cad）在结肠癌组织中的表达及其临床意义。 方法：收集2006年2月—2008年12月于中南大学湘雅医院行手术切除的结肠癌标本108例，采用免疫组化技术检测结肠癌组织中LSD1、E-cad、N-cad的表达，并分析其与患者临床病理特征及预后的关系。 结果：全组LSD1、E-cad、N-cad的阳性表率达分别为66.7%（72/108），85.2%例（92/108）、41.7%（45/108）。LSD1在较晚TNM分期、远处转移的结肠癌组织中的表达率明显增高，而E-cad则相反（均P<0.05），N-cad的表达在各项临床病理因素分组间差异均无统计学意义（均P>0.05）。LSD1与E-cad在结肠癌组织中的表达呈明显负相关（r=-0.318，P=0.001），与N-cad的表达无明显相关性（r=0.182，P=0.06）。LSD1的阳性表达组和E-cad的阴性表达组患者总生存率明显低于各自的阴性表达组与阳性表达组（均P<0.05），N-cad表达与否与患者总生存率无明显关系（P=0.410）。 结论：LSD1和E-cad的表达与结肠癌的转移有密切关系，阳性表达LSD1和阴性表达E-cad的结肠癌预示预后不良。     

凋亡抑制蛋白因子Livin 在结肠癌中表达的研究

目的：探讨凋亡抑制蛋白因子Livin在结肠癌组织中的表达及其与结肠癌发生发展的各临床病理因素之间的关系。 方法：收集2008年10月—2012年4月经手术切除且病理证实的95例结肠癌患者临床资料，记录患者性别、年龄、分化程度、浸润程度、淋巴结转移情况及TNM分期等各项临床相关资料。应用免疫组化方法检测Livin在95例结肠癌患者肠组织中的表达情况。 结果：Livin在结肠癌中表达阳性率46.32%（44/95）,明显高于对照组的12.82%（5/39）；Livin基因表达与患者性别、年龄、肿瘤病灶大小、是否有远处转移均无关（P>0.05）；与是否有淋巴结转移、TNM分期、分化程度及浸润深度有关 （P<0.05）。 结论：检测Livin在结肠癌组织中的表达对结肠癌的临床诊断、病情评估、治疗及预后可提供重要指导。     

miRNA-21在甲状腺乳头状癌组织中的表达及其意义

目的 检测人甲状腺乳头状癌标本中微小RNA(miRNA) -21的表达,并探讨其意义.方法 采用miRNA芯片技术和TaqMan探针荧光定量聚合酶链反应(PCR)方法,分别检测miRNA-21在3例和20例甲状腺乳头状癌和癌旁组织标本中的表达.结果 应用miRNAs芯片技术,对甲状腺乳头状癌标本进行检测,与癌旁组织比较,甲状腺乳头状癌筛选出的miRNA-21表达上调有统计学意义(P＜0.01);应用荧光定量PCR技术,检测出甲状腺乳头状癌标本中miRNA-21的平均表达水平较癌旁组织上调(3.97±1.29)倍,差异有统计学意义(P＜0.05).结论 miRNA-21显著高表达可能在甲状腺乳头状癌发生发展过程中起着重要的作用;miRNA芯片技术和TaqMan探针荧光定量PCR方法对minRNA21的检测结果具有一致性.     

Involvement of the insulin-like growth factor I receptor and its downstream antiapoptotic signaling pathway is revealed by dysregulated microRNAs in bladder carcinoma

ObjectiveUrothelial carcinoma is one of the most common pathological types of bladder cancer. Several studies have shown that dysregulated microRNAs (miRNAs) play an important role in bladder cancer progression. We performed the present miRNA microarray analysis in samples of urothelial carcinoma of the bladder and adjacent normal bladder tissue from Taiwanese patients to investigate dysregulated miRNAs.Materials and methodsTo detect dysregulated miRNAs in urothelial carcinoma of the bladder, samples of tumor and adjacent normal tissues were collected from 10 patients. Tissue samples from three patients were subjected to miRNA microarray analysis, and the remaining tissue samples from the other seven patients were used to validate the results obtained from the microarray data. Potential targets of these dysregulated miRNAs were identified using online databases, including MicroCosm and TargetScan.ResultsA panel of 30 differentially expressed miRNAs with at least fourfold differences in expression compared with normal controls, including 19 upregulated and 11 downregulated miRNAs, was generated. The expression levels of miR-30a-5p, miR-30a-3p, miR-99a, miR-130b, miR-133b, miR-135b, miR-145, miR-195, miR-204, and miR-214 were experimentally verified using real-time RT-PCR analysis. Using an online miRNA target database, we discovered that these dysregulated miRNAs potentially control components of the insulin-like growth factor 1 receptor (IGF1R) signaling pathway.ConclusionOur results indicate that dysregulated miRNAs may be involved in bladder cancer pathogenesis and are potential biomarkers.     

MiRNA-199a-3p in Plasma as a Potential Diagnostic Biomarker for Gastric Cancer

Background

MicroRNA (miRNA) has been shown the potential of cancer diagnosis. We investigated whether plasma miRNA expression could discriminate between patients with and without gastric cancer.

Methods

This study was divided into three steps: (1) miRNA microarray profiling on plasma samples from 20 gastric cancer patients and 20 healthy controls; (2) miRNA selection by real-time qRT-PCR on 30 pairs of plasma from patients and controls; and (3) qRT-PCR validation on an independent set of plasma from 180 gastric cancer patients, 80 healthy controls, and 20 patients with gastric precancerous diseases.

Results

Of the 959 human miRNAs analyzed by microarray, 37 up-regulated miRNAs and seven down-regulated miRNAs were found in gastric cancer plasma. Of the seven discrepant miRNAs validated on the plasma from 30 gastric cancer patients and 30 healthy controls, both miRNA-199a-3p and miRNA-151-5p were significantly elevated (p < 0.05) and were significantly reduced after surgery (p < 0.05) in gastric cancer patients. Further large-scale validation showed that these two miRNAs expressions in plasma were significantly higher in gastric cancer patients than healthy controls and patients with gastric precancerous diseases, respectively. However, only the expression of miRNA-199a-3p in plasma was significantly associated with tumor invasion and with lymph node metastasis and tumor, node, metastasis stage. This marker yielded an area under the receiver operating characteristic curve area of 0.837 with 80 % sensitivity and 74 % specificity in discriminating gastric cancer patients from healthy controls. In gastric cancer tissue, miRNA-199a-3p was expressed in the cytoplasm of tumor cells.

Conclusions

miRNA-199a-3p in plasma could be a novel potential diagnostic biomarker for gastric cancer detection.

     

miRNA-186-5p的表达与结肠癌细胞恶性表型的关系

目的:探究miRNA-186-5p在结肠癌中的表达与功能。方法:用q PCR检测20例配对的结肠癌与其癌旁组织标本,以及正常肠上皮NCM460细胞与不同结肠癌细胞系(HCT-116、HRT-18、HT-29)中miRNA-186-5p的表达;分别用miRNA-186-5p模拟物或阴性对照组序列转染HCT-116细胞后,用CCK-8实验、平板克隆形成实验、划痕实验及Transwell侵袭实验检测细胞增殖、迁移和侵袭情况。结果:miRNA-186-5p在结肠癌组织中的表达明显低于相应癌旁组织中的表达,在各结肠癌细胞系中均明显低于正常肠上皮NCM460细胞(均P0.05);与转染阴性对照序列的HCT-116细胞比较,转染miRNA-186-5p模拟物的HCT-116细胞,细胞增殖能力明显降低、克隆形成数明显减少(114.0个vs.311.7个)、划痕愈合率明显降低(28.7%vs.77.0%)、侵袭细胞数明显减少(119.3个vs.259.7个),差异均有统计学意义(均P0.05)。结论:miRNA-186-5p在结肠癌组织中低表达或缺失,恢复miRNA-186-5p的表达水平能抑制结肠癌细胞的恶性表型,提示miRNA-186-5p在结肠癌中发挥抑瘤作用。     

基于生物信息学构建胰腺癌患者预后相关miRNA预测模型及其应用价值

目的探讨基于生物信息学构建胰腺癌患者预后相关微小RNA(miRNA)预测模型及其应用价值。方法采用回顾性队列研究方法。收集肿瘤基因图谱计划(TCGA)数据库(https://cancergenome.nih.gov/)自建库起至2017年9月171例胰腺癌患者的临床病理资料;男93例,女78例;中位年龄为65岁,年龄范围为35~88岁。171例患者中,64例临床病理资料完整。171例患者采用随机抽样法按7∶3比例分为训练集123例和测试集48例。训练集用于构建预测模型,测试集用于验证预测模型效能。从GEO基因公共表达数据库中下载包含9对胰腺癌及对应癌旁组织的miRNA测序数据的数据集GSE41372,从癌组织及癌旁组织差异表达的miRNA中筛选出候选差异表达miRNA,基于训练集患者信息,进行LASSO-COX回归分析,从候选差异表达miRNA中筛选出与生存相关miRNA,将其拟合成一个相对精简的预后相关miRNA模型。分别在训练集和测试集中对构建的预后相关miRNA模型的预测效能进行验证,以受试者工作曲线下面积(AUC)评价模型准确性,以一致性指数(C-index值)评价模型效能。观察指标:(1)患者生存情况。(2)差异表达miRNA筛选结果。(3)预后相关miRNA模型的构建。(4)预后相关miRNA模型的验证。(5)胰腺癌患者临床病理因素比较。(6)影响胰腺癌患者预后的相关因素分析。(7)预后相关miRNA模型与第8版TNM分期预测效能的比较。正态分布的计量资料以±s表示,两组间比较采用Student-t检验,多组间比较采用方差分析。偏态分布的计量资料以M(范围)表示,组间比较采用Mann-Whitney U检验。计数资料以绝对数或百分比表示,组间比较采用χ2检验。等级资料分析采用秩和检验。采用计数资料相关性分析,挖掘预后相关miRNA模型与患者临床病理参数之间的相关性。采用COX进行单因素及多因素分析,并判断相关性,结果以风险比及95%可信区间表示,风险比<1时,证明该因素为保护因素;风险比>1时,证明该因素为危险因素;风险比=1时,说明对生存无明显影响。采用Kaplan-Meier法绘制生存曲线并计算生存率,采用Log-rank检验进行生存分析。结果(1)患者生存情况:123例训练集患者随访时间为31~2141 d,中位随访时间为449 d,3、5年总体生存率分别为16.67%、8.06%。48例测试集患者随访时间为41~2182 d,中位随访时间为457 d,3、5年总体生存率分别为15.63%、9.68%。两组患者3、5年总体生存率比较,差异均无统计学意义(χ2=0.017,0.068,P>0.05)。(2)差异表达miRNA筛选结果:生物信息学分析结果显示,共筛选102个候选差异表达miRNA,其中63个miRNA在癌组织中上调,39个miRNA在癌组织中下调。(3)预后相关miRNA模型的构建:在102个候选差异表达基因中,筛选出5个与生存相关的miRNA。名称分别为miR-21、miR-125a-5p、miR-744、miR-374b、miR-664,差异表达模式(癌组织对比癌旁组织)分别为升高、升高、降低、升高、降低,差异表达倍数分别为4.00、3.43、3.85、2.62、2.35倍。由5个与生存相关miRNA构建的预后表达方程=0.454×miR-21表达量-0.492×miR-125a-5p表达量-0.49×miR-744表达量-0.419×miR-374b表达量-0.036×miR-664表达量。(4)预后相关miRNA模型的验证:在训练集和测试集中,预后相关miRNA模型C-index值分别为0.643和0.642。(5)胰腺癌患者临床病理因素比较:COX分析结果显示,预后相关miRNA模型与肿瘤病理学T分期和肿瘤位置具有相关性(Z=45.481,χ2=10.176,P<0.05)。(6)影响胰腺癌患者预后的相关因素分析:单因素分析结果显示为肿瘤病理学N分期、接受放射治疗、接受分子靶向治疗、预后相关miRNA模型评分是胰腺癌患者预后的相关因素(风险比=2.471,0.290,0.172,2.001,95%可信区间为1.012~6.032,0.101~0.833,0.082~0.364,1.371~2.922,P<0.05)。多因素分析结果显示:接受分子靶向治疗是胰腺癌患者预后的独立保护因素(风险比=0.261,95%可信区间为0.116~0.588,P<0.05);预后相关miRNA模型评分≥1.16分是胰腺癌患者预后的独立危险因素(风险比=1.608,95%可信区间为1.091~2.369,P<0.05)。(7)预后相关miRNA模型与第8版TNM分期预测效能的比较:在训练集中,预后相关miRNA模型对胰腺癌患者3、5年生存时间预测概率与第8版TNM分期比较,差异有统计学意义(Z=-1.671,-1.867,P<0.05)。预后相关miRNA模型与第8版TNM分期AUC分别为0.797、0.935与0.737、0.703,95%可信区间分别为0.622~0.972、0.828~1.042与0.571~0.904、0.456~0.951;C-index值分别为0.643与0.534。在测试集中,预后相关miRNA模型对胰腺癌患者3、5年生存时间预测概率与第8版TNM分期比较,差异有统计学意义(Z=-1.729,-1.923,P<0.05)。预后相关miRNA模型与第8版TNM分期AUC分别为0.750、0.873与0.721、0.703,95%可信区间分别为0.553~0.948、0.720~1.025与0.553~0.889、0.456~0.950;C-index值分别为0.642与0.544。结论基于5个与胰腺癌生存相关miRNA构建可用于胰腺癌患者生存预测的预后相关miRNA模型。该模型可与现有TNM分期系统及其他临床病理参数形成互补,为患者提供个体化、准确的生存时间预测,为临床治疗提供参考。     

MiRNA-199a-3p in Plasma as a Potential Diagnostic Biomarker for Gastric Cancer

Background

MicroRNA (miRNA) has been shown the potential of cancer diagnosis. We investigated whether plasma miRNA expression could discriminate between patients with and without gastric cancer.

Methods

This study was divided into three steps: (1) miRNA microarray profiling on plasma samples from 20 gastric cancer patients and 20 healthy controls; (2) miRNA selection by real-time qRT-PCR on 30 pairs of plasma from patients and controls; and (3) qRT-PCR validation on an independent set of plasma from 180 gastric cancer patients, 80 healthy controls, and 20 patients with gastric precancerous diseases.

Results

Of the 959 human miRNAs analyzed by microarray, 37 up-regulated miRNAs and seven down-regulated miRNAs were found in gastric cancer plasma. Of the seven discrepant miRNAs validated on the plasma from 30 gastric cancer patients and 30 healthy controls, both miRNA-199a-3p and miRNA-151-5p were significantly elevated (p < 0.05) and were significantly reduced after surgery (p < 0.05) in gastric cancer patients. Further large-scale validation showed that these two miRNAs expressions in plasma were significantly higher in gastric cancer patients than healthy controls and patients with gastric precancerous diseases, respectively. However, only the expression of miRNA-199a-3p in plasma was significantly associated with tumor invasion and with lymph node metastasis and tumor, node, metastasis stage. This marker yielded an area under the receiver operating characteristic curve area of 0.837 with 80 % sensitivity and 74 % specificity in discriminating gastric cancer patients from healthy controls. In gastric cancer tissue, miRNA-199a-3p was expressed in the cytoplasm of tumor cells.

Conclusions

miRNA-199a-3p in plasma could be a novel potential diagnostic biomarker for gastric cancer detection.

     

结直肠癌肝脏转移相关微小RNA224的研究

目的研究结直肠癌肝脏转移微小RNA（microRNA,miRNA）表达的差异以及相关特性。方法收集2009年4月至2010年11月期间首都医科大学附属复兴医院的10例伴或不伴肝脏转移的结直肠癌患者的肿瘤组织标本,应用miRNA芯片方法对2组样本的miRNA表达差异情况进行研究,并通过实时定量PCR对miRNA的芯片表达差异进行验证。结果芯片结果筛选出6种结直肠癌肝脏转移组较非转移组表达失调的miRNA（上调的miR-224、miR-1236和miR-622,下调的miR-155、miR-342-5p和miR-363）,选取显著上调（即差异信号值大于500）的miR-224进行实时定量PCR验证,结果与芯片实验结果相一致。结论 miR-224可能通过调节其靶基因而在结直肠癌肝脏转移中起重要作用,miR-224可能成为未来结直肠癌生物标记或治疗方法的一个研究方向。     

Combination of three miRNA (miR-141, miR-21, and miR-375) as potential diagnostic tool for prostate cancer recognition

Purpose

Prostate cancer (PCa) is a common tumor disease in western countries and a leading cause of cancer-driven mortality in men. Current methods for prostate cancer detection, like prostate-specific antigen screening, lead to significant overtreatment. The purpose of the study was to analyze circulating microRNAs in serum as non-invasive biomarkers in patients with diagnosis of prostate cancer and healthy individuals.

Methods

This preliminary study included a population of 20 patients with mean age of 68.6 years and mean PSA of 21.3 ng/ml. Eight healthy patients were used as control. MiRNAs were quantified in the total RNA fraction extracted from serum and levels of five microRNAs (miR-106b, miR-141, miR-21, mir-34a, and miR-375) were quantified by RT-qPCR. Statistical analyses evaluated correlation between clinicopathological data and miRNAs expression levels.

Results

Relative expression ratios of miR-106b, miR-141-3p, miR-21, and miR-375 were significantly increased (1.8-, ?1.9-, 2.4-, and 2.6-fold, respectively) in the PCa group compared to healthy control. Using receiver operating characteristics, the highest area under the curve equal to 0.906 was obtained for miR-357 and indicates a very good diagnostic properties of this biomarker. We found expression level of mir-34a not related with PCa.

Conclusions

Our results support previous findings on the possibility of discriminating prostate cancer patients from healthy controls by detecting miRNA (miR-141-3p, miR-21, and miR-375). Further insights into miRNA abundance and characteristics are necessary to validate the panel of miRNA as surrogate markers in diagnosis of prostate cancer.

     

早期胃癌特征性miRNA筛选

目的检测早期胃癌组织中微小RNA（miRNA）表达谱,筛选出早期胃癌的特征性miRNA。方法应用中通量基因芯片技术来检测5例早期胃癌组织及其癌旁组织标本中miRNA的表达。结果相对于癌旁组织,早期胃癌组织中共有36个miRNA表达下调,如miR-9．1、miR-103、miR-141等;12个miRNA表达上调,如miR．196a、miR．142．3p、miR-25等。结论在早期胃癌组织中表达异常的miRNA可能与胃癌发生发展有着一定的相关性。