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1.
目的:检测非小细胞肺癌(non—small cell lung cancer,NSCLC)患者外周血血浆中p16基因、O^6-甲基乌嘌呤-DNA甲基转移酶(O^6-methylguanine—DNA methyhransferase,MGMT)基因启动子的甲基化状态,探讨p16、MGMT基因启动子的异常甲基化在NSCLC筛查及早期诊断中的意义。方法:利用巢式甲基化特异性聚合酶链反应法检测NSCLC患者外周血血浆p16、MGMT基因启动子的甲基化状态。结果:65例NSCLC血浆样品中分别发现19例(29.23%)p16基因启动子异常甲基化和16例(24.62%)MGMT基因启动子异常甲基化,45例正常对照血浆组未检测到p16、MGMT基因启动子的异常甲基化(P〈0.05),血浆中两基因甲基化检出率与NSCLC的分型及临床分期无明显相关性(P〉0.05)。结论:利用巢式甲基化特异性PCR法检测外周血血浆中p16、MGMT基因启动子的甲基化,可为NSCLC的筛查、早期诊断及预后判断提供有价值的信息。  相似文献   

2.
背景与目的:探讨食管鳞状细胞癌中06-甲基鸟嘌呤-DNA甲基转移酶(O6-methylguanine DNA methyltransferase,MGMT)基因和p16基因启动子的甲基化情况,了解这两个基因启动子甲基化与食管癌发生的关系. 材料与方法:采用甲基化特异性PCR(MSP)方法分别对44例食管鳞状细胞癌组织进行MGMT基因和p16基因的甲基化检测,并对其甲基化频率分别进行差异性检验和关联性分析.结果:在44例食管鳞癌组织中,有18例(40.9%)出现MGMT基因启动子甲基化,23例(52.3%)出现p16基因启动子甲基化,7例(14.9%)两基因均出现甲基化,10例(22.7%)两基因均未出现甲基化.MGMT和p16基因启动子甲基化率差异无统计学意义(P>0.05).MGMT和p16基因启动子甲基化无明显相关关系(P>0.05).结论:MGMT和p16基因启动子甲基化均可能与食管鳞状细胞癌发生、发展过程密切相关,但二者是相互独立进行的.  相似文献   

3.
目的:探讨p16、死亡相关蛋白激酶(death-associated protein kinase,DAP)基因的异常甲基化作为非小细胞肺癌(NSCLC)患者诊断的基因标志物的可行性。方法:采用甲基化特异性PCR(MSP)法检测30例NSCLC患者肿瘤组织及对应血清中p16、DAP基因的异常甲基化,结果:NCSLC肿瘤中60.0%(18/30)检测出至少一个基因启动子呈甲基化改变,在18例肿瘤组织检测到异常甲基化的患者中,50.0%的患者(9/18)在血清中检测到相应的改变。所有的癌旁组织、健康对照组的血清中及正常肺组织均未检测到p16、DAP的甲基化,结论:检测NSCLC患者血清中p16、DAP基因异常甲基化有可能成为肺癌诊断的分了标志物。  相似文献   

4.
食管鳞癌中p16基因启动子区甲基化及其表达   总被引:2,自引:0,他引:2       下载免费PDF全文
 目的探讨食管鳞癌(ESCC)p16基因甲基化的状况及其表达与食管鳞癌临床病理特征之间的关系。方法采用甲基化特异性PCR方法(MSP)分别检测75例食管癌组织、癌旁组织和切缘组织p16基因启动子区域CpG岛甲基化状态。采用Envision免疫组化法检测食管癌组织及癌旁组织的p16蛋白的表达。结果75例标本中,食管癌组织、癌旁组织和切缘细织p16基因甲基化率分别为41.3%(31/75)、13.3%(10/75)和6.67%(5/75)。癌组织和癌旁组织P16蛋白的阳性表达率分别为29.3%(22/75)和56.7%0(17/30)。31例癌组织p16基因甲基化阳性标本中有2例(6.4%)检测到P16蛋白的表达,而44例癌组织p16基因甲基化阴性标本中有20例(45.5%)检测到P16蛋白的表达。食管癌组织p16基因甲基化率显著高于癌旁组织和切缘组织(P〈0.01),P16蛋白表达与p16基因甲基化呈负相关。p16基因启动子区甲基化与食管癌的组织学分级、肿瘤部位无明显相关,与临床分期、淋巴转移密切相关。结论p16基因甲基化在食管癌发生发展中起着重要作用,食管鳞癌的分期和淋巴结转移与p16基因甲基化之间有密切关系。  相似文献   

5.
目的:研究外阴鳞状细胞癌患者癌组织p16和DAPK基因组蛋白H3K27三甲基化状态及mRNA表达水平。方法:采用染色质免疫共沉淀-实时定量聚合酶联反应(ChIP-qPCR)技术对8例外阴鳞状细胞癌患者癌组织和毗邻正常组织p16和DAPK基因组蛋白H3K27三甲基化状态进行定量分析;随后采用定量反转录聚合酶联反应(qRT-PCR)检测其基因的mRNA表达水平。结果:外阴鳞状细胞癌患者癌组织p16和DAPK基因组蛋白H3K27三甲基化水平增高;其三甲基化水平较毗邻正常组织有显著性差异(P<0.05);进一步表达分析显示p16和DAPK基因其mRNA表达降低。结论:外阴鳞状细胞癌患者癌组织p16和DAPK基因组蛋白H3K27三甲基化水平增高,组蛋白H3K27三甲基化异常参与外阴鳞状细胞癌的发生,极可能成为外阴鳞状细胞癌新的表观治疗靶点。  相似文献   

6.
目的探讨p16基因启动子的甲基化与乳腺浸润性导管癌发生的关系。方法采用甲基化特异性聚合酶链反应法(MSP),对42份乳腺浸润性导管癌组织和24份乳腺非癌组织进行p16基因甲基化检测。结果 42例乳腺癌中,18例检测到p16基因甲基化,甲基化率为42.9%;24例乳腺非癌组织中检测到2例(均为乳腺纤维腺瘤)甲基化,甲基化率为8.3%。p16基因启动子的甲基化率乳腺癌组与非癌组比较有显著性差异(χ2=8.619,P〈0.05)。结论 p16基因甲基化对乳腺浸润性导管癌的临床诊断具有一定指导意义。  相似文献   

7.
食管癌中DNA修复基因MGMT启动子区CpG岛过甲基化研究   总被引:6,自引:1,他引:6  
目的:探索O~0-甲基鸟嘌呤-DNA甲基转移酶(O~6-methylguanine-DNA methyltransferase,MGMT)基因启动子区过甲基化状态与食管癌的关系。方法:采用甲基化特异性聚合酶链反应(methylation-specific PCR,MSP)分析食管癌、癌旁和正常食管黏膜细胞中MGMT基因启动子区过甲基化状态。用免疫组织化学SP法检测上述组织中MGMT蛋白表达情况。结果:76例食管癌组织中有26例(34.2%)MGMT基因启动子过甲基化,相应的癌旁组织中有8例发生甲基化,而正常食管黏膜细胞中均无甲基化。所有甲基化的癌组织中均无MGMT蛋白表达,而所有非甲基化的癌组织、相应癌旁组织和8例正常组织中均有MGMT蛋白表达。结论:MGMT基因启动子区过甲基化而使其蛋白表达缺失,可能是食管癌发生的重要因素。  相似文献   

8.
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。  相似文献   

9.
 目的 探讨p15、p16 基因的高甲基化与多发性骨髓瘤(MM)的发病和预后之间的关系。方法 采用巢式甲基特异性PCR法(nMSP)检测47例MM患者p15、p16基因的甲基化状态,并对患者的临床资料及预后因素进行分析。结果 47例MM患者p15、p16 基因的甲基化比例分别为59.57 %(28/47)、 57. 45 %(27/47),两者同时存在甲基化者23 例(48.94 %)。Ⅱ、Ⅲ期MM患者p15 、p16基因甲基化率明显高于Ⅰ期患者。结论 p16 、p15 基因的高甲基化与MM的发病及预后相关。  相似文献   

10.
食管癌前病变组织p16及FHIT基因甲基化探讨   总被引:11,自引:3,他引:11  
目的:探讨食管癌前病变组织p16及FHIT基因启动子区CpG岛的甲基化状况.方法:采用甲基化特异性聚合酶链反应(MSP)方法,对食管癌前病变不同阶段及鳞状细胞原位癌的病变组织进行了甲基化检测,并与同一个体相应的病变旁组织及慢性食管炎和浸润性鳞癌组织的甲基化情况进行了时比分析研究.结果:轻度、中重度不典型增生、鳞状细胞原位癌和浸润癌共95例病变组织中p16基因的甲基化频率分别为22.73%、59.09%、78.57%、64.86%:FHIT基因的甲基化频率分别为22.73%、45.45%、64.29%、67.57%.同一个体相应的95例病变旁对照组织中16例未检测成功,余79例中5例(6.33%)p16基因甲基化,3例(3.80%)FHIT基因甲基化,与病变组织相比,均有统计学差异.10例慢性食管炎组织中1例p16基因甲基化,未发现FHIT基因甲基化.结论:p16及FHIT基因甲基化在癌前病变阶段就已经存在,可能是食管癌发生的早期事件之一.  相似文献   

11.
PURPOSE AND EXPERIMENTAL DESIGN: Recent evidence shows that the presence of promoter hypermethylation of tumor suppressor genes has been demonstrated in the serum DNA of patients with various cancers such as lung, liver, and head and neck cancer. We have examined promoter hypermethylation of the p16 gene in esophageal squamous cell carcinoma (SCC) using methylation-specific PCR to detect tumor DNA in the serum. RESULTS: Aberrant promoter methylation of the p16 gene was detected in 31 of 38 (82%) esophageal SCCs. Subsequently, we tested for promoter methylation in the paired serum DNA of 31 patients with a p16 alteration in the primary tumor. We found that 7 of these 31 (23%) patients had the same methylation changes in the serum DNA. CONCLUSIONS: This result indicates that promoter methylation present in the tumors of esophageal SCC patients can be detected in the serum of the same patient and that this approach can potentially be used for the screening and monitoring of the disease.  相似文献   

12.
目的:检测新疆哈萨克族食管鳞癌组织中抑癌基因Smad4启动子区的甲基化状态,并描述其在哈萨克族食管鳞癌发生和发展中的作用。方法:应用MassARRAY技术平台检测2009—01-01—2011—10-31新源县人民医院收集的新疆食管癌高发区-伊犁哈萨克自治州哈萨克族食管鳞癌组织37例和当地正常人食管组织33例中Smad4基因启动子的甲基化状态。结果:哈萨克族食管癌组与对照组中Smad4基因启动子的12个CpG单位,6-甲基化率的平均值分别为40.07%和30.15%,差异有统计学意义,Z=-2.611,P=0.01】。哈萨克族食管鳞癌组织和正常人食管组织中Smad4基因启动子区CpG-1的平均甲基化水平分别为1.7%和O.7%,z=-2.2,P=0.028;CpG-16—19的平均甲基化水平分别为4.5%和2.2%,z=-3.3,P=0.001;CpG-27—28的平均甲基化水平分别为4.9%和3.0%,z=-2.6,P=0.007;CpG-31—33的平均甲基化水平分别为6.8%和5.5%,z=-2.5,P=0.012。结论:Smad4基因启动子甲基化参与了哈萨克族食管癌的发生和发展,Smad4基因启动子区CpG-1、CpG-16—17—18—19、CpG-27—28和CpG-31—32—33甲基化状态的改变可能与新疆哈萨克族食管癌发生和发展有关。  相似文献   

13.
郑芸  张有为  陈龙邦 《癌症进展》2010,8(3):290-294
目的检测食管鳞癌患者血清中RUNX3基因启动子区域甲基化状态,探讨用于食管鳞癌早期诊断和预后评估的临床意义。方法留取70例食管鳞癌,20例食管良性病变及10例健康志愿者血清标本,甲基化特异性聚合酶链反应(MSP)分析RUNX3基因启动子区域甲基化情况,并分析其与临床病理参数之间的相关性。结果70例食管鳞癌患者血清RUNX3基因启动子区域异常甲基化36例,检出率为51.4%,20例食管良性病变患者中有2例为不完全甲基化(10%),而10例健康志愿者中检出率为0,差异有统计学意义(P〈0.001);RUNX3基因启动子甲基化与患者临床分期和淋巴结转移相关。结论RUNX3基因启动子甲基化在食管鳞癌患者血清中有着较高的检出率,可望成为食管鳞癌早期诊断和预后评估的分子标志物。  相似文献   

14.
Leukoplakia is the most frequent oral precancerous lesion and shows a variable rate of malignant transformation. We hypothesised that the detection of molecular alterations, like the promoter hypermethylation of DNA, in oral cytological samples from patients at risk of developing primary or recurrent tumours could be a valuable diagnostic and prognostic tool in the management of these lesions. Two groups of patients with differing risks of developing oral squamous cell carcinoma (OSCC) were analysed. DNA was extracted from the oral rinse of each patient. The methylation status of the p16, p14 and MGMT gene promoters was determined using a methylation-specific polymerase chain reaction (MSP). Methylation of p16 and MGMT was observed in 44 and 56% of the oral samples, respectively. Only 12% of the cases showed p14 methylation. DNA hypermethylation was more frequent in patients with previous OSCC. DNA promoter hypermethylation is frequent during early oral carcinogenesis and even more so in the later stages. MSP using oral rinses is a non-invasive and highly sensitive technique which could be used to monitor patients with precancerous and cancerous oral lesions.  相似文献   

15.
An Q  Liu Y  Gao Y  Huang J  Fong X  Li L  Zhang D  Cheng S 《Cancer letters》2002,188(1-2):109-114
We detected tumor-associated aberrant hypermethylation of the p16 gene in plasma DNA from 105 non-small cell lung cancer (NSCLC) patients (65 squamous cell carcinoma (SCC) and 40 adenocarcinoma (ADC)) and 92 matched tumor DNA samples, using a modified semi-nested methylation-specific PCR (MSP). This technique increased the sensibility of detecting p16 hypermethylation from DNA samples in varying stages. p16 hypermethylation was present in 73.3% (77/105) of the plasma samples, and 79.3% (73/92) of the tumor samples. Among those cases with methylated p16 sequence in tumor samples, 87.7% (64/73) also demonstrated this epigenetic alteration in the corresponding plasma DNA. Only patients whose tumor cells had hypermethylated p16 gene exhibited aberrant methylation in their plasma samples. Regarding different clinical stages of SCC and ADC, the frequencies of p16 hypermethylation in plasma DNA were nearly the same as those in corresponding tumors, except for stage I ADC. Our study indicated that aberrant methylation of p16 may be an excellent biomarker for early diagnosis and follow-up of NSCLC patients, and MSP is a reliable method for these purposes.  相似文献   

16.
目的:研究食管鳞状细胞癌(esophageal squamous cell carcinoma,ESCC)包含氧化还原酶的WW结构域(WW domain containing oxidoreductase,WWOX)基因启动子甲基化及mRNA的表达与ESCC发生发展的关系。方法:采用改进的甲基化特异性PCR(methylation specific PCR,MSP)和RT-PCR技术检测69例ESCC组织及48例相应癌旁正常组织中WWOX基因的DNA甲基化和mRNA表达情况。结果:ESCC组织中WWOX基因启动子的甲基化发生率为26.1%(18/69),显著高于癌旁正常组织4.2%(2/48)(P=0.002);Ⅲ、Ⅳ期食管癌患者中WWOX基因甲基化发生率(43.3%,13/30)显著高于Ⅰ、Ⅱ期(12.8%,5/39)(P=0.004);低分化癌组的甲基化发生率(33.3%,4/12)高于高分化(20.0%,3/15)和中分化组(26.2%,11/42),但其差异均无统计学意义(P〉0.05)。ESCC组织中WWOX基因mRNA的相对表达量比相应癌旁正常组织低,差异具有统计学意义(P〈0.05)。ESCC组织中WWOXmRNA的相对表达量与临床病理因素无明显相关关系(P〉0.05)。结论:WWOX基因启动子甲基化可能与ESCC的形成和进展有关。  相似文献   

17.
Aim. Detection of methylation in the p16 gene, an inhibitor of cyclin D-dependent protein kinase, as a new tumor marker for early detection of esophageal squamous cell carcinoma (ESCC) in DNA derived from blood and serum. Method. A large family with clustering of ESCC was assessed in Khorasan province in northeastern Iran. The family had three histologically proven cases of ESCC in two consecutive generations and several other deceased cases with histories of ESCC. DNA from blood of 28 living family members in three consecutive generations, 30 sporadic ESCC cases (from serum, blood, and tumor tissues), and 30 healthy volunteers (from blood) were examined for the methylation status of p16 promoter using methylation-specific PCR (MSP). Results. Aberrant p16 promoter methylation was found in 64.3% (n=28) of ESCC family members and none (n=30) of our normal volunteers. Five of the 28 family members with esophageal cancer symptoms had negative endoscopy results for ESCC, while four of these members had p16 hypermethylation in their blood. The family members with negative endoscopy and positive p16 promoter methylation are being monitored closely for signs of ESCC development through regular check-ups and chromoendoscopies. In sporadic ESCC in northeastern Iran, 73.3% (n=30) of tumor tissue samples had p16 hypermethylation. Serum and blood samples from the same patients showed p16 hypermethylation in 26.6% and 43.3% of the samples, respectively. Conclusion. Aberrant p16 methylation may be a valuable diagnostic tool as a tumor marker for the early identification of individuals in high risk ESCC families.  相似文献   

18.
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