非小细胞肺癌中ASC基因启动子甲基化的意义

目的 :探讨非小细胞肺癌(NSCLC)中ASC基因启动子甲基化与患者临床特征之间的关系以及去甲基化试剂对肺癌细胞系中ASC基因甲基化状态的逆转。 方法 :应用甲基化特异性PCR(MSP)检测48例NSCLC患者肿瘤组织和3株肺癌细胞系中ASC基因的甲基化状态,RT-PCR检测去甲基化试剂诱导肺癌细胞系中甲基化ASC基因的重新表达。 结果 :NSCLC肿瘤组织和相对应的正常肺组中ASC基因启动子甲基化的发生率分别为49.7%和8.3%,二者之间有显著性差异(P<0.01)。重度吸烟患者的肿瘤组织中ASC基因启动子甲基化的发生率明显增高(P<0.05),早期的NSCLC(T1)中ASC基因启动子甲基化也有相对较高的发生率(P<0.05)。去甲基化试剂5-氮-2'-脱氧胞苷(5-aza-2'-deoxycytidine)可使甲基化的ASC基因启动子发生逆转而获得重新表达。 结论 :ASC基因启动子的甲基化可能与吸烟引起的非小细胞肺癌有关,并可能是非小细胞肺癌发展过程中的一个早期事件,甲基化的ASC基因可以成为NSCLC治疗的靶点。     

非小细胞肺癌患者血清CDH13基因甲基化检测及意义

肺癌是全世界范围内首位肿瘤死因.由启动子异常甲基化造成的特定基因的沉默在肺癌发病机制中起重要作用.钙a附素(cadherin)是调整上皮表型和肿瘤侵袭力的细胞黏附分子.     

中国非小细胞肺癌患者血清DAPK基因、p16基因启动子甲基化的分析

Objective： To evaluate the clinical significance of the aberrant methylation of DAPK gene and p16 gene in sera from 65 NSCLC patients from Nanjing General Hospital of Nanjing Command, China. Methods： A methylation-specific PCR （MSP） was performed for the detection of promoter hypermethylation of DAPK gene and p16 gene in blood DNA from 65 cases of NSCLC, and to analyze the relation of the aberrant methylation of DAPK gene and p16 gene and the clinicopathological data. Results： 30.8% （20/65） of the sera from 65 cases of NSCLC showed hypermethylation for DAPK promoter and 43.1% （28/65） the same for p16 promoter, whereas no methylated DAPK gene promoter and p16 gene promoter were found in sera from the patients with lung benign diseases and normal controls. Methylated DAPK gene promoter and p16 gene promoter in sera were not closely correlated with the pathological classification, stage, metastasis and differentiation in NSCLC. Conclusion： Detection of the aberrant methylation of DAPK gene and p16 gene in blood DNA from NSCLC patients might offer an effective means for the earlier auxiliary diagnosis of the malignancy.     

非小细胞肺癌患者血清Ras相关区域家族1A基因启动子异常甲基化检测及其临床意义

目的 研究非小细胞肺癌(NSCLC)患者血清Ras相关区域家族1A(RASSF1A)基因启动子区域的甲基化状态及其临床意义.方法 采用甲基化特异性聚合酶链反应(MSP)技术,检测75例NSCLC患者血清RASSF1A基因启动子区域的甲基化状态,并分析其与临床病理参数之间的相关性.结果75例NSCLC患者血清RASSF1A基因启动子区域异常甲基化检出率为30.7%(23/75),而35例肺部良性疾病患者和15例健康志愿者中检出率均为0,差异有统计学意义(P＜0.001).RASSF1A启动子异常甲基化与NSCLC患者的年龄、性别、病理类型无显著相关性,但在晚期及肿瘤分化程度较低的患者中检出率较高(P＜0.05).结论 RASSF1A启动子异常甲基化在NSCLC的发生、发展中起重要作用,有望成为NSCLC辅助诊断和预后判断的分子标记.     

非小细胞肺癌患者血浆DAPK基因甲基化检测及其临床意义

目的分析非小细胞肺癌(NSCLC)患者血浆中死亡相关蛋白激酶(DAPK)基因异常甲基化及其在NSCLC筛查和诊断方面的临床意义。方法用巢式甲基化特异性聚合酶链反应(nMSP)检测112例NSCLC患者癌组织、癌旁组织、外周血血浆和112例正常对照组血浆样品中DAPK基因的甲基化情况,并比较各组检测结果。结果癌组织DAPK基因甲基化率为59.8%,高于癌旁组织的8.0%(P<0.001),其中鳞癌、腺癌、腺鳞癌癌组织和癌旁组织间的甲基化检出率比较差异均有统计学意义(P<0.001);NSCLC患者血浆中DAPK基因甲基化检测率为21.4%,对照组血浆未检测到DAPK基因甲基化(P<0.001)。血浆中DAPK基因甲基化检出率与NSCLC临床分类、临床分期和病理类型无明显相关性。结论利用nMSP法对血浆样本DAPK基因甲基化检测可为非小细胞肺癌的筛查和诊断提供有价值的信息。     

非小细胞肺癌患者血浆RAR-β基因甲基化检测及其临床意义

检测非小细胞肺癌（non-small cell lung cancer patients,NSCLC）患者组织和血浆中RAR-β基因甲基化状态,探讨RAR-β基因甲基化在NSCLC筛查和早期诊断中的临床意义。方法：选择120例NSCLC患者,用巢式甲基化特异性聚合酶链反应（nested methylation-specific PCR,nMSP）检测肺癌组织、癌旁组织和外周血血浆RAR-β基因的甲基化,并对120例正常对照组血浆样品进行RAR-β基因甲基化检测,各组检测结果进行比较。结果：肺癌组织RAR-β基因甲基化率59.2%,高于癌旁组织的17.5%（P<0.001）;NSCLC患者血浆样品中RAR-β基因甲基化检测率为27.5%,对照组血浆未检测到RAR-β基因甲基化（P<0.001）;肺癌患者血浆样品与癌组织RAR-β基因甲基化检出率有显著相关性（P<0.001）;血浆中RAR-β基因的甲基化检出率与NSCLC临床分类、临床分期和病理类型均无明显相关性。结论：利用nMSP法对血浆样本RAR-β基因甲基化的检测可为肺癌的早期筛查和诊断提供有价值的信息。     

中国非小细胞肺癌患者血清DAPK基因、p16基因启动子甲基化的分析(英文)

目的分析65名中国南京军区南京总医院的非小细胞肺癌(NSCLC)住院患者血清中DAPK、p16启动子区域甲基化的改变状况及其临床意义。方法运用甲基化特异性PCR技术,检测65例NSCLC患者血清DAPK、p16基因启动子区域甲基化的改变情况,并分析与临床病理资料的关系。结果 NSCLC患者血清DAPK基因甲基化检出率为30．8％(20/65),p16基因甲基化检出率为43．1％(28/65),而正常对照组和良性肺部疾病组血清未检出DAPK基因、p16基因甲基化,DAPK基因、p16基因甲基化检出率与NSCLC病理类型、分期及转移状态无明显关系。结论 DAPK基因、p16基因检出启动子区域异常甲基化是NSCLC早期辅助诊断的分子标志物之一。     

肺癌患者GSTP1基因启动子甲基化检测及其临床价值

目的 在肺癌的发生发展过程中,甲基化异常是导致相关基因失活的重要机制.本研究探讨肺癌患者谷胱甘肽S转移酶P1基因(Glutathione S-transferases P1,GSTP1)甲基化水平及其对肺癌诊断的临床价值.方法 收集2015-10-01-2016-01-31郑州大学第一附属医院收治的100例患者的肺泡灌洗液,其中80例肺癌患者(小细胞肺癌和非小细胞肺癌)为肺癌组,20例良性肺疾病患者(肺炎、慢性阻塞性肺疾病和肺结核)为对照组.以PCR联合高分辨率熔解曲线(high resolution melting assay,HRM) (PCR-HRM)方法检测GSTP1基因启动子甲基化水平,并结合肺癌患者临床病理特征进行分析.结果 肺癌组GSTP1基因启动子甲基化率为42.5％(34/80),显著高于对照组的15.0％(3/20),x2 =5.191,P=0.023.不同年龄、性别及病理类型肺癌患者GSTP1基因启动子甲基化率,差异均无统计学意义,P值分别为0.397、0.853和0.751.早期(Ⅰ和Ⅱ期)肺癌患者GSTP1基因启动子甲基化率42.5％(17/40),显著低于晚期(Ⅲ和Ⅳ期)的70.0％(28/40),x2=11.931,P=0.013;但显著高于对照组,x2=4.538,P=0.033.高、中分化肺癌患者GSTP1基因启动子甲基化率为43.9％(18/41),显著低于低分化患者的79.5％(31/39),x2=10.664,P=0.010;但显著高于对照组,x2 =4.974,P=0.026.结论 GSTP1基因启动子甲基化改变与肺癌发生发展及恶性程度有关,GSTP1基因启动子甲基化检测可能有助于肺癌诊断.     

人非小细胞肺癌细胞EGFR基因启动子甲基化与吉非替尼敏感性之间的相关性研究

目的 探讨EGFR基因启动子甲基化水平与人非小细胞肺癌（NSCLC）细胞株对吉非替尼敏感性之间的相关性。方法 用不同浓度吉非替尼分别作用于NSCLC细胞株HCC827、H1650、H1975、H358、H1299、A549后,CCK-8法检测细胞增殖抑制率,DNA直接测序法、实时荧光定量PCR法、免疫印迹法和甲基化特异性PCR法分别检测上述NSCLC细胞株EGFR基因突变、EGFR mRNA、EGFR蛋白表达和启动子区甲基化状态。结果 CCK-8法检测结果显示,19外显子缺失突变的HCC827细胞对吉非替尼最敏感,而同为19外显子缺失突变的H1650细胞对吉非替尼不敏感;野生型的H358细胞对吉非替尼中度敏感,其敏感性甚至超过19外显子突变的H1650细胞,而同为EGFR野生型的H1299、A549细胞对吉非替尼敏感性较差。吉非替尼处理72h后,HCC827细胞与H358细胞相比、HCC827细胞和H358细胞与其他4株细胞相比,IC50值均有显著性差异（P＜0.05）。HCC827细胞EGFR启动子为未甲基化状态,其EGFR蛋白和mRNA表达最高;H358细胞为部分甲基化,其EGFR蛋白和mRNA为中等表达;其他4个细胞株均为高甲基化状态,EGFR蛋白和mRNA呈低表达;HCC827细胞的EGFR表达水平较H358细胞高,HCC827和H358细胞的EGFR表达较其他4个细胞株高,差异均有统计学意义（P＜0.05）。结论 EGFR基因启动子区高甲基化可能下调EGFR基因的表达水平,从而降低NSCLC对吉非替尼的敏感性;对该基因的甲基化检测可能对预测吉非替尼治疗NSCLC疗效有一定的临床指导意义。     

非小细胞肺癌患者外周血和肺癌组织中ZIC1启动子甲基化检测的临床意义

目的 探讨ZIC1基因在NSCLC患者外周血和肺肿瘤组织中的甲基化状态,及其对NSCLC的预后评估意义.方法 选取95例NSCLC患者外周血、癌和癌旁组织,另选取95例健康体检者外周血为对照组.用MSP法比较外周血和癌组织的ZIC1甲基化检出率;分析ZIC1在外周血和癌组织的甲基化和NSCLC临床病理因素的相关性.结果...     

MiR-34b和miR-155在非小细胞肺癌中的表达及临床意义

目的:检测肺癌组织及癌旁正常组织中miR-34b和miR-155的表达水平及其与肺癌临床病理特征之间的关系。方法:收集50例非小细胞肺癌患者的肺癌组织和癌旁正常肺组织标本,运用 Real-time PCR检测 miR-34b和miR-155在肺癌组织和癌旁正常肺组织中的表达情况,分析其表达与肺癌临床病理特征之间的关系。结果:Real-time PCR 检测显示在50例非小细胞肺癌组织中 miR-34b的表达显著低于癌旁正常肺组织(P=0.019),而miR-155的表达显著高于癌旁正常肺组织(P=0.000)。MiR-34b和miR-155的表达与淋巴结转移情况显著相关（P均＜0.05,miR-34b呈负相关,miR-155呈正相关）;与性别、年龄、病理类型及肿瘤分化程度无明显相关;miR-34b的表达与临床病理分期无显著相关,而miR-155表达与临床病理分期显著相关。结论:MiR-34b和miR-155的异常表达与非小细胞肺癌的发生发展相关,其可能成为肺癌的筛查、诊断及治疗的肿瘤标志物。     

非小细胞肺癌组织中Apaf-1基因表达及启动子区甲基化研究

目的:探讨Apaf1基因表达及启动子区甲基化在非小细胞肺癌(nonsmallcelllungcancer,NSCLC)发生中的作用。方法:应用免疫组化、半定量RTPCR和甲基化特异性PCR方法分析45例NSCLC及癌旁正常对照组织中Apaf1(apoptoticproteaseactivatingfactor1)基因的表达及启动子区甲基化情况。结果:60%(27/45)NSCLC组织Apaf1表达明显下调,与癌旁正常组织相比差异有统计学意义,P=0.0005。在Apaf1基因表达明显下调的27例NSCLC中19例出现甲基化,表达水平无明显变化的18例NSCLC中5例出现甲基化;二者对比差异有统计学意义,P=0.005。45例癌旁正常对照组织未检测到Apaf1基因启动子甲基化,提示启动子区甲基化是Apaf1基因表达下调的主要原因。结论:Apaf1基因与NSCLC相关,启动子区甲基化是该基因失活的重要机制。     

Surgery for early stage non-small cell lung cancer

Lung cancer accounts for 28.2% of all cancer-related deaths in the United States. Most patients present with advanced-stage disease, with only 15% having disease confined to the lung. Surgical resection is the optimal treatment for Stage I and II non-small cell lung cancer. Pre-resection staging includes various radiographic modalities, including PET scan and mediastinoscopy. Survival and local recurrence statistics favor full anatomic lobar resection over sublobar resection, although cases must be judged individually. Lobectomy via thoracoscopic approach appears to have equivalent outcome as lobectomy via thoracotomy. Characteristics of the counseling physician and the hospital volume at which the surgery is performed can also influence outcome. After surgical resection, stage IA patients have about 70% 5-year survival, but this falls below 50% for stage IIB patients. Methods that identify early-stage lung cancer patients at greatest risk for recurrence are needed to identify patients who may benefit from additional therapies.     

Survival in untreated early stage non-small cell lung cancer

BACKGROUND: The aim of this study was to determine the survival of untreated stage I and II in non-small cell lung cancer (NSCLC) patients. PATIENTS AND METHODS: A retrospective analysis of medical charts of all patients diagnosed with early stage NSCLC, between January 1990 and December 2001, was conducted and patients who were not treated were identified. Data on patient's age, gender, stage of the disease, pathology, reason for non-treatment and cause of death were reviewed. RESULTS: Thirty-nine patients with untreated stage I and II NSCLC were identified. The median age at diagnosis was 77 years; 66.7% were men and 33.3% were women. All patients were Caucasian and 66.7% had stage I disease, 46.2% had squamous cell carcinoma, while adenocarcinoma was found in 28.2%. The major reason for non treatment was chronic obstructive pulmonary disease (64.1%) and the main cause of death was metastatic disease (48.7%). The overall mean survival was 11.9 months. The mean survival at stage I was not statistically different from the mean survival at stage II (13.7 months vs. 8.4 months) (p < 0.12). CONCLUSION: Patients with untreated early stages NSCLC have a very poor prognosis. Alternative therapies that are better tolerated should be investigated in these patients with early stage NSCLC who cannot be offered standard treatment.     

早期非小细胞肺癌预后相关因素分析

早期非小细胞肺癌患者首选手术治疗后，仍有部分出现了局部复发和／或远处转移。筛选出预后差的患者辅以综合治疗显得尤为重要。本文分析了近年来研究的一些早期非小细胞肺癌的预后因素。     

非小细胞肺癌EGFR启动子区甲基化和mRNA表达临床意义的探讨

目的:研究表皮生长因子受体(EGFR)的表达与非小细胞肺癌(NSCLC)组织学类型和淋巴结转移的关系,分析EGFR启动子区甲基化与其mRNA表达的关系.方法:应用免疫组织化学法检测60例非小细胞肺癌组织中EGFR的表达,统计EGFR与病理类型及淋巴结转移的关系.用实时定量PCR方法检测其中30例非小细胞肺癌组织和对应的癌旁组织中EGFR mRNA的表达,用甲基化特异性PCR(MSP)方法检测EGFR启动子区的甲基化状态.结果:鳞癌中EGFR阳性率为38.5％(10/26),明显低于腺癌中EGFR阳性率76.5％ (26/34),差异有统计学意义,x2=8.87,P=0.002 9;且有淋巴结转移的NSCLC中EGFR的阳性率为73.7％(28/38),而无淋巴结转移的NSCLC中EGFR的阳性率为45.5％(10/22),差异有统计学意义,x2=4.78,P=0.028.30例有癌旁组织的标本中,11例患者肿瘤组织EGFR的表达高于其癌旁组织;12例标本中存在肿瘤组织EGFR基因启动子区甲基化水平与EGFR mRNA表达呈负调节关系.结论:EGFR的表达与NSCLC的病理类型及淋巴结转移相关,部分NSCLC患者中存在EGFR基因启动子区甲基化水平与EGFR基因mRNA表达呈负调节关系.     

Estrogen receptor expression and gene promoter methylation in non-small cell lung cancer - a short report

Purpose

In the past, anomalous estrogen receptor (ER) regulation has been associated with various lung pathologies, but so far its involvement in lung cancer initiation and/or progression has remained unclear. Here, we aimed at assessing in vivo and in vitro ER expression and its possible epigenetic regulation in non-small cell lung cancer (NSCLC) samples and their corresponding normal tissues and cells.

Methods

ERα and ERβ gene expression levels were assessed using real time quantitative PCR (RT-qPCR), whereas ERα and ERβ gene promoter methylation levels were assessed using DNA bisulfite conversion followed by pyrosequencing. We included NSCLC (n = 87) and adjacent histologically normal lung tissue samples from lung cancer patients (n = 184), primary normal bronchial epithelial-derived cell cultures (n = 11), immortalized bronchial epithelial-derived cell lines (n = 3) and NSCLC derived cell lines (n = 9).

Results

Using RT-qPCR we found significantly lower ERα and ERβ expression levels in the NSCLC tissue samples compared to their normal adjacent tissue samples. These lower ER expression levels were confirmed in vitro using primary normal bronchial epithelial-derived cell cultures, immortalized bronchial epithelial-derived cell lines and NSCLC-derived cell lines. By using this latter panel of cells, we found that ER gene promoter hypermethylation was associated with decreased ER expression. In addition we found that in tumor and normal lung tissues, smoking was associated with decreased ER expression and that normal lung tissues with a low ERβ expression level exhibited increased smoking-related DNA adducts.

Conclusions

Taken together, our results indicate that decreased ER expression mediated by DNA methylation may play a role in NSCLC development.