Analysis of miR-205 and miR-155 expression in the blood of breast cancer patients

The purpose of this study was to identify and validate circulating microRNAs (miRNAs) in human plasma for use as breast cancer (BC) biomarkers and to analyze their relationship to clinicopathologic features and its preliminary biological function. Genome-wide expression profiling of miRNAs in BC was investigated by microarray analysis. miR-155 was up-regulated greater than two-fold in BC compared with Normal Adjacent Tissue (NAT), whereas let-7b, miR-381, miR-10b, miR-125a-5p, miR-335, miR-205 and miR-145 were down- regulated greater than two-fold. Our hypothesis was that circulating miRNAs are also present and differentially expressed in the serum of BC patients compared to controls. Using real-time PCR (RT-PCR), we analyzed miR-205 and miR-155 in archived serum from 30 participants, 20 with breast cancer and 10 healthy people. miR-205 was down-regulated in BC patient serum while miR-155 was up-regulated. Furthermore, we analyzed the relationship between the expression levels of these two miRNAs and the clinicopathologic parameters of BC patients. High expression of miR155 was associated with clinical stage, molecular type, Ki-67 and p53 in BC patients (P<0.05). By contrast, we found no significant correlation between miR-205 and BC patient clinicopathologic parameters. Functional analysis showed that ectopic expression of miR-205 significantly inhibits cell proliferation and promotes apoptosis. miR-205 was down-regulated and miR-155 was up-regulated in BC patient serum. miR-155 was positive correlated with clinical stage and ki-67 and negatively correlated with p53 status.     

血清外泌体miR-148a联合miR-106a检测用于胃癌筛查的研究探讨

  目的  寻找合适的外泌体miRNA作为肿瘤生物标志物，辅助临床进行胃癌筛查。  方法  将miR-148a及miR-106a作为潜在标志物，研究两种miRNA在癌组织及癌旁组织表达的差异性。选取2017年9月至2018年9月在福建省立医院诊治的初诊胃癌术后标本共37对（胃癌组织及癌旁组织）进行组织学miRNA检测。选取初诊胃癌患者83例为胃癌组，良性病变的患者78例为对照组，全部进行血清外泌体miRNA检测。  结果  与癌旁组织相比，癌组织中miR-148a表达水平降低，miR-106a表达水平升高，联合检测2-△△CP[△CP=CP_{（miR-148a）}-CP_{（miR-106a）}]值降低。与对照组相比，胃癌患者中血清外泌体miR-106a表达水平降低，联合检测2-△△CP值升高。血清外泌体联合检测2-△△CP值对胃癌组和对照组鉴别的曲线下面积[AUC为0.844（95%CI:0.782~0.905，P < 0.001）]，大于miR-148a及miR-106a单独检测，其cut-off值为0.315 3，敏感度为91，6%，特异度为64.1%。  结论  血清外泌体miR-148a联合miR-106a检测的2-△△CP值可以作为胃癌筛查的手段。      

Mature miR-184 as Potential Oncogenic microRNA of Squamous Cell Carcinoma of Tongue.

PURPOSE: The aim of this study was to evaluate the microRNA expression patterns in squamous cell carcinoma (SCC) of the tongue. EXPERIMENTAL DESIGN: Expression levels of 156 human mature microRNAs were examined using real-time quantitative PCR (Taq Man MicroRNA Assays; Human Panel) on laser microdissected cells of 4 tongue carcinomas and paired normal tissues. Expression of mature miR-184 was further validated in 20 paired tongue SCC and the normal tissues. Potential oncogenic functions of miR-184 were evaluated in tongue SCC cell lines (Cal27, HN21B, and HN96) with miR-184 inhibitor. Plasma miR-184 levels were evaluated using real-time quantitative PCR. RESULTS: Using 3-fold expression difference as a cutoff level, we identified 24 up-regulated mature miRNAs including miR-184, miR-34c, miR-137, miR-372, miR-124a, miR-21, miR-124b, miR-31, miR-128a, miR-34b, miR-154, miR-197, miR-132, miR-147, miR-325, miR-181c, miR-198, miR-155, miR-30a-3p, miR-338, miR-17-5p, miR-104, miR-134, and miR-213; and 13 down-regulated mature miRNAs including miR-133a, miR-99a, miR-194, miR-133b, miR-219, miR-100, miR-125b, miR-26b, miR-138, miR-149, miR-195, miR-107, and miR-139. Overexpression of miR-184 was further validated in 20 paired tongue SCC and normal tissues (P = 0.002). Inhibition of miR-184 in tongue SCC cell lines could reduce cell proliferation rate. Down-regulation of c-Myc was observed in two cell lines in response to miR-184 inhibitor. Suppressing miR-184 could induce apoptosis in all three cell lines. Plasma miR-184 levels were significantly higher in tongue SCC patients in comparison with normal individuals, and the levels were significantly reduced after surgical removal of the primary tumors. CONCLUSIONS: Overexpression of miR-184 might play an oncogenic role in the antiapoptotic and proliferative processes of tongue SCC. In addition, plasma miR-184 levels were associated with the presence of primary tumor. Further studies on the aberrantly expressed miRNAs in tongue SCC as well as using plasma miRNAs as novel tumor markers are warranted.     

Down Regulated Expression Levels of miR-27b and miR-451a as a Potential Biomarker for Triple Negative Breast Cancer Patients Undergoing TAC Chemotherapy

Background: Triple negative breast cancer (TNBC) is associated with poor prognosis, aggressive phenotype(s) of tumours, partial chemotherapy response, and lack of clinically proven therapies. MicroRNAs (miRNAs) can target and modulate key genes that are involved in TNBC chemotherapy. Deregulated miRNA expression is highly involved in anti-cancer drug resistance phenotype and thus, miRNAs tend to be promising candidates for prediction of chemotherapy response and recurrence. Aim: This study aimed to investigate the expression levels of selected miRNAs (miR-21, miR-27b, miR-34a, miR-182, miR-200c and miR-451a) in cancerous and normal adjacent tissues of TNBC patients and to correlate with the clinicopathological data. Methods: Forty-one (41) FFPE tissue block of histopathologically confirmed TNBC patients was collected. Total RNA from the cancerous and adjacent non-cancerous tissues were isolated, transcribed, and pre-amplified. The relative expression level of miRNAs in tumour and normal adjacent tissues of TNBC patients was analysed using qRT-PCR. Results: Out of six miRNAs studied, the relative expression of miR-27b and miR-451a were found to be significantly lower in cancerous as compared to normal adjacent tissues of TNBC patients. In addition, a significant down regulation of miR-451a was also observed in infiltrating ductal carcinoma subtype, stages I and II, in both grade II and III, premenopausal and postmenopausal as well as in those with positive axillary lymph node metastases. Conclusion: The results suggest the possible utilization of miR-27b and miR-451a expression levels as potential predictive risk markers for TNBC patients undergoing TAC chemotherapy.     

血清微小RNA(miR-129-3p、miR-767-3p和miR-877)在结直肠癌诊断中的价值

目的:探讨血清微小RNA (microRNA,mi RNA)在结直肠癌诊断中的价值.方法:通过miRNA表达谱芯片检测7例结直肠癌患者血清和10例健康志愿者血清中差异表达的miRNA.应用实时荧光定量PCR法在40例结直肠癌患者血清和18例健康志愿者血清中验证芯片结果,并分析血清特异性miRNA在结直肠癌诊断中的价值.结果:筛选获得10个在结直肠癌中特异性表达的血清miRNA,实时荧光定量PCR验证后获得一组结直肠癌特异性血清miRNA(miR-129-3p、miR-767-3p及miR-877*)生物标志物,这组生物标志物组合检测结直肠癌的灵敏度为77.78％、特异度为100％,并可产生最大受试者工作特征曲线(receiver operator characteristic curve,ROC)的曲线下面积(area under the curve,AUC)为0.914.结论:miR-129-3p、miR-767-3p和miR-877*生物标志物组合有望成为结直肠癌筛查和早期诊断的指标.     

MicroRNAs miR-7 and miR-340 predict response to neoadjuvant chemotherapy in breast cancer

Purpose

miRNAs have been linked to chemosensitivity of breast cancer cells in vitro. In patients, however, there is no clinically validated method for predicting chemotherapy response. The aim of this study was to assess whether (I) a specific pattern of miRNA expression in pretherapeutic biopsies can predict response to neoadjuvant chemotherapy, and (II) differential miRNA expression in residual tumor after completion of chemotherapy allows further prognostic stratification of non-responding patients.

Methods

Sixty-four patients with newly diagnosed large (≥3 cm) or locally advanced primary breast cancers who underwent neoadjuvant anthracycline/taxane-based chemotherapy were included. Relative expression of 10 miRNAs likely to be associated with chemotherapy response (miR-7,-21,-29a,-29b,-34a,-125b,-155,-200c,-340,-451) was determined by quantitative RT-PCR from pretherapeutic biopsies (n = 64) and residual invasive tumor after chemotherapy (n = 42). Pathologic complete response (pCR) defined by absence of invasive tumor served as reference standard. In addition, miRNA expression was compared with disease-free and overall survival.

Results

Nine (14%) of 64 patients achieved pCR. High expression of miR-7 and low expression of miR-340 in pretherapeutic biopsies predicted pCR with a negative predictive value of 96 and 97%, respectively (specificity 54 and 57%). The combined profile of miR-7^high/miR-340^low demonstrated improved specificity of 86% while maintaining a high negative predictive value (96%) to identify non-responders. Pretherapeutic expression of miR-200c and miR-155 showed prognostic information, and low expression was associated with increased overall survival (115 vs. 90 months, p ≤ 0.03). After chemotherapy, the overall survival of patients with residual invasive tumor was better for those demonstrating low miR-7 or high miR-125b (p = 0.01).

Conclusions

Intratumoral expression of miR-7 and miR-340 prior to neoadjuvant chemotherapy could be used to predict pCR and a profile of miR-7^low or miR-340^high identified patients unlikely to achieve pCR who might benefit from alternative treatment options including earlier surgery. Our study identifies miRNAs as promising predictive biomarkers, which could aid in optimization of breast cancer management and treatment stratification.

     

miR-140 and miR-196a as Potential Biomarkers in Breast Cancer Patients

Objective: MiR-140 and miR-196a were known to be correlated with cancer diagnosis and prognosis. The current study aimed at the analysis of miR-140 and miR-196a expression patterns and their clinical significance for breast cancer (BC) patients. Methods: Differentially expressed miR-140 and miR-196a were examined via quantitative PCR in 110 cases of BC and their adjacent non-tumor (ANT) tissues. Results: The results indicated that miR-140 and miR-196a, respectively, notably decreased and increased expression in BC samples in comparison with ANT (p<0.001). Reduced miR-140 expression was also related to Lymph node metastasis (LNM, P= 0.023) and stage (P = 0.009). Additionally, Receiver Operating Characteristics (ROC) analysis illustrated that miR-140 had a significant diagnostic accuracy for stage and LNM of BC patients. We also discovered a strong negative correlation between miR-196a expression with histological grade (P = 0.038), LNM (P = 0.012) and stage (P = 0.001). Conclusion: Overall, exploring the miR-140 and miR-196a profiles not only can statistically different among BC and ANT samples, but it is also expected to become potential BC biomarkers.     

液态活检miR-509-5p/miR-124比值诊断膀胱癌的临床应用

背景与目的:液态活检是一种从血液、尿液等非实体生物组织中取样分析,主要用于恶性肿瘤诊断、监测及判断预后的方法.该研究通过优化尿液miRNA的提取方法,建立标准化的液态活检手段,筛选并验证膀胱癌患者尿液miRNA标志物以阐明其临床应用价值.方法:收集2014年1月—2015年9月膀胱癌患者及健康对照者的尿液,应用miRNA表达谱芯片进行筛选,在78例膀胱癌患者及23例健康对照者的晨尿中进行实时荧光定量聚合酶链反应(real-time fluorescent quantitative polymerase chain reaction,RTFQ-PCR)验证,分析液态活检的miRNA标志物与膀胱癌临床病理的关系及其诊断价值.结果:通过对6例膀胱癌及6例健康对照者的尿液miRNA表达谱进行分析,筛选出了10个miRNA有差异表达,结合既往文献报道的膀胱癌尿液miRNA标志物,我们挑选了20个miRNA进行RTFQ-PCR验证,发现miR-509-5p/miR-124比值在膀胱癌患者尿液中表达水平较健康对照者高,差异有统计学意义(P<0.0001).尿液miR-509-5p/miR-124比值随着患者肿瘤分期和肿瘤分级的上升而升高(P=0.003).当界值定在0.41时,miR-509-5p/miR-124比值对膀胱癌的诊断灵敏度为73.1%,特异度为82.6%,曲线下面积(area under the curve,AUC)达到0.864,比尿液脱落细胞学的诊断价值高(P=0.0002).结论:该研究优化了尿液miRNA的提取方法,建立了标准化的液态活检尿液miRNA标志物的检测手段,发现miR-509-5p/miR-124比值可能是膀胱癌理想的诊断标志物.     

Pap Smear miR-92a-5p and miR-155-5p as potential diagnostic biomarkers of squamous intraepithelial cervical cancer

Background: one of the female-specific diseases with a high incidence and mortality is cervical cancer. The main cause of cervical cancer is infection with Human papilloma virus (HPV). Low-grade squamous intraepithelial lesions (LSIL) and High-grade squamous intraepithelial lesions (HSIL) usually is caused by an HPV infection. Considering the role of microRNAs (miRNAs) as diagnostic biomarkers for a variety of cancers, the aim of this study was to determine miR-92a-5p and miR-155-5p expression levels in LSIL and HSIL Pap Smear samples. Methods: After initial bioinformatic studies, A total of 75 samples (25 samples of patients with LSIL, 25 patients with HSIL and 25 healthy individuals) were subjected to RNA extraction and cDNA synthesis. The expressions levels of confirmed miRNAs in samples of patients with LSIL, HSIL and healthy individuals were evaluated by Real time PCR analysis. To demonstration the role of predicted miRNAs as novel biomarkers in diagnosis of LSIL and HSIL, ROC curve analysis was done. Results: Bioinformatics results showed that miR-92a-5p and miR-155-5p target the HPV E6 and E7 genes. The expression levels of these miRNAs were strikingly higher in Pap smear of patients with LSIL than in the healthy individuals (35.36, P = 0.001) (62.23, P = 0.001). Similarity, expression levels of miR-92a-5p and miR-155-5p were amazingly higher in patients with HSIL than in the healthy individuals (33.62, P= 0.001) (69.07, P= 0.001). Although, the levels of miR-92a-5p (0.95, P = 0. 85) and miR-155-5p (1.11, P = 0.84) exhibited no statistical differences between patients with LSIL and HSIL. Also, ROC curve analyses verified that miR-92a-5p and miR-155-5p are specific and sensitive and may serve as new biomarkers for the early detection of cervical cancer. Conclusion: These data suggest miR-92a-5p and miR-155-5p, which are upregulated in LSIL and HSIL, can be consider as predictive biomarkers for the prognosis of cervical cancer patients.     

Diagnostic Value of Plasma miR-145 and miR-185 as Targeting of the APRIL Oncogene in the B-cell Chronic Lymphocytic Leukemia

Background: Chronic lymphocytic leukemia (CLL) is one of the most common hematologic malignancy in adults worldwide. This cancer has a poor prognosis at different stages. So, the identification of new biomarkers is important for diagnosis of B-CLL. Considering the oncogenic role of APRIL molecule in this leukemia as well as the regulatory role of miRNAs in different signaling pathways, the present study evaluated the miRNAs targeting APRIL gene in B-CLL. Methods: The miRNAs were predicted and selected using bioinformatics algorithms. A total of 80 plasma samples were subjected to RNA extraction and synthesis of cDNA. The expressions levels of predicted miRNAs and APRIL gene in plasma of B-CLL patients and healthy individuals were assessed by Real time PCR analysis. ROC analysis was performed to investigate the role predicted miRNAs as novel biomarkers in diagnosis of B-CLL. Results: The results of the prediction showed that miR-145-5p and miR-185-5p target the APRIL gene. The expression level of APRIL gene was strikingly higher in plasma of B-CLL patients than in the healthy individuals (102, P= 0.001). On the other hand, expression levels of miR-145-5p and miR-185-5p were strikingly lower in B-CLL patients than in the healthy individuals (0.07, P= 0.001) (0.29, P= 0.001). Also, ROC curve analyses demonstrated that miR-145-5p and miR-185-5p are specific and sensitive and may serve as new biomarkers for the detection of B-CLL. (AUC; 0.95, sensitivity; %90) (AUC; 0.87, sensitivity; %63). Conclusion: These data suggest that miR-145-5p and miR-185-5p target the APRIL gene and might have a role in diagnosis of B-CLL. Therefore, these two miRNAs can be served as a novel and potential biomarker for detection of B-CLL.     

HPV阳性宫颈癌组织中miR-34b的表达水平及其临床意义

目的:探讨miR-34b在HPV阳性宫颈癌组织中的表达水平及其对患者的临床意义。方法:收集65例HPV阳性宫颈癌组织标本和35例正常宫颈组织标本,采用Real-time PCR法测定miR-34b的相对表达水平,分析其与患者临床病理特征的关系以及对患者诊断、预后的价值。结果:miR-34b在HPV阳性宫颈癌组织中的相对表达量明显低于正常宫颈组织,差异具有统计学意义（t=9.549,P＜0.05）;在HPV阳性宫颈癌患者中,miR-34b的相对表达量与患者的年龄、病理类型、肿瘤分级均无明显关系（P＞0.05）,与患者的肿瘤大小、FIGO分期、淋巴结是否转移显著相关,差异具有统计学意义（χ2=4.996、5.925、5.824,P＜0.05）;进行ROC曲线分析,发现miR-34b区分HPV阳性宫颈癌细胞与正常宫颈细胞的AUC为0.871（95%CI:0.773~0.970,P=0.000）,灵敏度为90.24%,特异度为79.17%;对HPV阳性宫颈癌患者随访3年,发现miR-34b高表达患者的OS、DFS均显著高于低表达患者,差异具有统计学意义（χ2=5.856、5.919,P＜0.05）。结论:miR-34b在HPV阳性宫颈癌组织中呈低表达,可能为HPV阳性宫颈癌筛查、诊断和治疗提供帮助,具体情况还有待进一步研究。     

miR-34b和miR-155在膀胱尿路上皮癌中的表达及意义

目的:检测miR-34b和miR-155在膀胱尿路上皮癌中的表达,分析其在不同临床病理特征中的表达差别。方法:选取2014年1月至2016年1月我院收治的79例膀胱尿路上皮癌患者为观察组,选取距肿物边缘>3 cm的正常膀胱黏膜组织52例作为对照组,应用实时荧光定量PCR法检测两组中miR-34b和miR-155的表达情况。结果:两组中miR-34b和miR-155的表达差别有统计学意义,观察组中miR-34b和miR-155的表达在不同病变级别、是否浸润、脉管癌栓、淋巴结转移及TNM分期的表达中差别有统计学意义。观察组中miR-34b的表达与增殖指数间呈负相关性,miR-155的表达与增殖指数间呈正相关性。生存分析显示二者的表达与生存时间有关。结论:膀胱尿路上皮癌组织中miR-34b低表达、miR-155高表达,对病变的形成和进展有重要的促进作用。二者对肿瘤的作用可能与对细胞增殖的促进作用有关。术后检测miR-34b和miR-155的表达对判断预后可能有一定价值。     

Epigenetic regulation of miR-34b and miR-129 expression in gastric cancer

MicroRNAs (miRNAs) are small noncoding RNAs that play fundamental roles in diverse biological and pathological processes by targeting the expression of specific genes. Here, we identified 38 methylation-associated miRNAs, the expression of which could be epigenetically restored by cotreatment with 5-aza-2'-deoxycytidine and trichostatin A. Among these 38 miRNAs, we further analyzed miR-34b, miR-127-3p, miR-129-3p and miR-409 because CpG islands are predicted adjacent to them. The methylation-silenced expression of these miRNAs could be reactivated in gastric cancer cells by treatment with demethylating drugs in a time-dependent manner. Analysis of the methylation status of these miRNAs showed that the upstream CpG-rich regions of mir-34b and mir-129-2 are frequently methylated in gastric cancer tissues compared to adjacent normal tissues, and their methylation status correlated inversely with their expression patterns. The expression of miR-34b and miR-129-3p was downregulated by DNA hypermethylation in primary gastric cancers, and the low expression was associated with poor clinicopathological features. In summary, our study shows that tumor-specific methylation silences miR-34b and miR-129 in gastric cancer cells.     

血清miR-15b诊断子宫内膜癌及预判淋巴结转移的价值分析

[目的]探讨血清miR-15b用于诊断子宫内膜腺癌的价值及其对淋巴结转移的预判能力。[方法]选取21例我院收治并诊断为子宫内膜腺癌及13例无生殖系统疾病的健康女性,采用酶联吸附法检测血清CA125、HE4水平,应用实时荧光定量技术对血清中miR-15b的水平进行相对定量。利用相关和回归分析对miR-15b指标与CA125、HE4做关联探讨;对子宫内膜腺癌患者淋巴结转移情况与miR-15b变量值进行ROC分析,寻找最佳的截断值。[结果]子宫内膜腺癌患者的血清CA125、HE4和miR-15b含量均高于对照组,差异有统计学意义。CA125与HE4、HE4与miR-15b之间存在线性正相关关系。CA125在FIGO各期中比较无差异,HE4和miR-15b在FIGO的各期均存在差异。当血清miR-15b水平相对于正常健康人群高出3倍,此时诊断淋巴转移的敏感度为90.91%,特异性为60%。[结论]血清HE4与miR-15b可联合诊断子宫内膜腺癌,且miR-15b在子宫内膜腺癌的FIGO病理分期中存在差异,在判断肿瘤淋巴结转移方面有较高的价值。     

卵巢癌血清相关miRNAs的筛选及其临床意义

背景与目的：卵巢癌预后较差,发现时通常是晚期,需找寻与卵巢癌发生、发展相关的诊治方法。该研究检测miRNA在上皮性卵巢癌患者术前外周血清及良性卵巢肿瘤患者外周血清中表达情况的差异,筛选差异有统计学意义的miRNA并分析其与上皮性卵巢癌患者临床病理特征、预后等的关系。方法：定制研究相关的48种miRNA表达谱芯片,通过TaqMan低密度微阵列芯片,筛选出有统计学意义的miRNA。采用实时荧光定量聚合酶链反应(real-time fluorescent quantitative polymerase chain reaction,RTFQ-PCR)法验证筛选的miRNA在卵巢良、恶性肿瘤患者血清中的表达情况,选择具有统计学意义的miRNA行大样本验证并分析其与肿瘤分期、组织病理及预后等的关系。结果：通过TaqMan低密度微阵列芯片筛选和RTFQ-PCR验证,发现miR-125b在上皮性卵巢癌患者血清中的表达高于良性肿瘤患者(P=0.039),miR-125b在早期患者中的表达量高于晚期患者(P=0.003),术后无残余肿瘤患者表达量高于术后有残余肿瘤患者(P=0.013)。血清miR-125b高表达有利于卵巢癌患者无进展生存期(progression-free survival,PFS)延长(P=0.003),但对总生存期(overall survival,OS)无明显影响(P=0.069)。结论：miR-125b在上皮性卵巢癌的发生、发展中起着关键作用,与患者预后相关,是预测卵巢癌复发的潜在基因,但在肿瘤不同期别的表达情况发生变化,在早期作用比较明显,在晚期或肿瘤残余较多的患者表达较不明显,其作用机制有待进一步研究。