乳头状甲状腺癌TSHR基因转录表达和启动子区甲基化研究

目的观察抑癌基因促甲状腺激素受体(TSHR)在乳头状甲状腺癌(PTC组)中的表达,分析其启动子甲基化与肿瘤发生的关系。方法选择50例PTC和32例良性甲状腺肿瘤(对照组,包括20例结节性甲状腺肿,12例甲状腺腺瘤)患者,对两组患者手术获取的标本提取RNA后,反转录为cDNA,进行PCR检测TSHR基因的表达情况;运用甲基化特异性PCR(MSP)检测上述组织中TSHR基因启动子区甲基化的情况。结果PTC组患者中有34例(68%)TSHR基因启动子发生甲基化,16例(32%)TSHR基因mRNA表达缺失;对照组患者中有7例(21.9%)TSHR基因启动子发生甲基化,4例(12.5%)TSHR基因mRNA表达缺失。PTC组织TSHR基因启动子甲基化率及TSHR基因mRNA表达缺失率均显著高于对照组(χ2值分别为16.61和4.02,P<0.05)。34例发生了TSHR基因启动子甲基化的PTC患者中,有14例(41.2%)TSHR mRNA表达缺失;16例未发生甲基化的PTC患者中,2例(12.5%)发生了mRNA表达缺失,二者mRNA表达缺失率差异有统计学意义(χ2=4.11,P<0.05)。TSHR基因mRNA在...     

TSHR和RASSF1A基因甲基化与乳头状甲状腺癌的相关性

目的:研究乳头状甲状腺癌TSHR和RASSF1A基因启动子甲基化的状况,分析两种抑癌基因甲基化与临床病理资料间的关系及两种抑癌基因甲基化的相关性,探讨PTC的发生机制。方法:提取50例PTC组织和32例对照组织DNA,使用甲基化PCR检测两种基因启动子区甲基化的情况;对两种基因甲基化和未甲基化的组织测序;采用SPSS13.0软件分析两种抑癌基因甲基化之间的关系及两种抑癌基因启动子甲基化和主要的临床病理参数的关系。结果:50例PTC中,发现34例TSHR基因、30例RASSF1A基因启动子发生甲基化;32例对照组中,7例TSHR基因、10例RASSF1A基因启动子发生了甲基化;PTC组TSHR基因和RASSF1A基因启动子甲基化率均显著高于对照组,差异有统计学意义。DNA测序证实,两种抑癌基因发生甲基化的其CpG岛的碱基仍为CG,未发生甲基化的碱基由CG变为TG。计算TSHR和RASSF1A基因甲基化间的相关系数r=0.490,提示PTC组两个抑癌基因甲基化之间存在显著相关性。RASSF1A和TSHR基因甲基化与患者的年龄、性别、临床分期均未见相关性;RASSF1A基因甲基化与患者是否伴有淋巴结转移无关,TSHR基因甲基化与患者是否伴有淋巴结转移相关。结论:两种抑癌基因启动子甲基化与PTC的发生有关,且可能在甲状腺肿瘤的早期阶段既已存在;TSHR基因甲基化在甲状腺癌的恶性进展中可能发挥一定作用。     

抑癌基因RAS启动子甲基化与乳头状甲状腺癌的关系

目的观察抑癌基因RAS在乳头状甲状腺癌(papillary thyroid carcinoma,PTC)中的表达,分析其启动子甲基化与肿瘤发生的关系。方法 选择50例PTC和32例良性甲状腺肿瘤(对照组,包括20例结节性甲状腺肿,12例甲状腺腺瘤)患者,对2组患者手术获取的标本提取RNA后,反转录为cDNA,进行多聚酶链反应(polymerase chain reaction,PCR),检测RAS基因的表达情况;运用甲基化特异性PCR(methylation-specific PCR,MSP)检测上述组织中RAS基因启动子区甲基化的情况,并对2种抑癌基因甲基化和未甲基化的组织随机进行测序。结果 PTC组患者中,有30例(60%)RAS基因启动子发生甲基化;对照组患者中,有10例(31.3%)RAS基因启动子发生甲基化;PTC组织RAS基因启动子甲基化率均显著高于对照组,差异有统计学意义(χ2=6.46,P<0.05)。乳头状甲状腺癌mRNA的半定量的值为0.56±0.10,对照组mRNA半定量的值为0.67±0.16,乳头状甲状腺癌mRNA的表达明显低于对照组,两者差异具有统计学意义(t=2.83,P<0.05)。经DNA测序证实,RAS基因启动子发生甲基化的其CpG岛的碱基未发生改变,仍为CG;未发生甲基化的,碱基由CG变为TG。结论 PTC患者RAS基因启动子甲基化发生率显著高于良性甲状腺肿瘤患者,而RAS基因mRNA的表达则较良性甲状腺肿瘤降低;推测RAS基因启动子甲基化可能与PTC的发生、发展相关。     

乳腺癌相关基因异常甲基化与临床病理特征的关联研究

目的 探讨基因异常甲基化与乳腺癌临床病理特征的关联。方法 共纳入70例临床确诊的乳腺癌患者为病例组,采用甲基化特异性PCR法检测BRCA1、GSTP1、p16、MGMT、PTEN、RARβ2和CCND2等抑癌基因启动子区甲基化状态,分析不同临床特征的患者甲基化频率间的差异。结果 BRCA1、GSTP1、p16、MGMT、PTEN、RARβ2和CCND2的甲基化率分别为24.3%、31.4%、40.0%、27.1%、48.6%、55.7%和67.1%。94.3%的乳腺癌患者至少有1个基因发生甲基化,发生淋巴结转移的患者BRCA1甲基化率高于无淋巴结转移者,p16和PTEN基因甲基化与绝经状态有关,ER阴性、PR阴性、p53阳性患者更易发生RARβ2基因甲基化。结论 乳腺癌组织中抑癌基因异常甲基化与淋巴结转移、绝经状态、激素受体表达等临床病理特征有关。     

大肠癌p16抑癌基因甲基化及与Dukes分期的关系

目的检测大肠癌患者p16基因启动子CpG区甲基化的改变,探讨其与大肠癌发生、发展和临床资料的关系.方法采用甲基化特异PCR技术(MSP法)研究58例大肠癌标本p16基因甲基化改变,分析临床病理资料.结果 25例标本(43.1%)呈p16 CpG区甲基化阳性;Dukes C、D期病人p16 CpG区甲基化发生率(75%)明显高于Dukes A、B期病人(13.3%).结论 p16启动子区甲基化导致p16抑癌基因失活参与了大肠癌的发生和发展;p16甲基化可能可以作为估计大肠癌病人预后的一个指标.     

肝癌病人癌组织与血浆p16及APC基因甲基化检测及意义

目的检测肝细胞性肝癌(HCC)病人癌组织及血浆中多肿瘤抑制因子p16和结肠腺瘤样息肉基因(APC)的基因启动子区异常甲基化状态,并探讨其临床意义。方法应用实时荧光PCR技术,检测86例HCC病人癌组织、癌旁正常组织及血浆标本中p16、APC基因启动子区异常甲基化状态,以24例正常肝组织作为对照。结果 24例正常肝组织未检出p16和APC基因的异常甲基化。癌组织p16基因甲基化率明显高于癌旁正常组织和对应的血浆标本(χ2=67.48、6.72,P<0.05)。癌组织中APC基因甲基化率明显高于癌旁正常组织和对应的血浆标本(χ2=18.03、29.16,P<0.05)。肝癌组织及对应血浆标本p16、APC基因甲基化的一致率分别为65.4%、43.3%。HBsAg阳性组肝癌组织及其对应血浆标本p16基因甲基化率显著高于HBsAg阴性组,差异有统计学意义(χ2=5.60、5.67,P<0.05)。结论 p16、APC基因启动子区异常甲基化导致的基因沉默可能与HCC的发生和发展密切相关。     

化瘀解毒益气法对胃癌前病变模型大鼠p16基因甲基化的影响

目的:观察化瘀解毒益气法对胃癌前病变大鼠胃黏膜组织病理学及p16基因甲基化状态的影响。方法:采用低浓度MNNG加服雷尼替丁的方法造模,20周造模成功之后将大鼠随机分为模型组、维甲酸组、益气通络解毒散组,各组治疗干预后,观察各组大鼠胃黏膜变化情况并采用甲基化特异性PCR(methylation-specific PCR,MSP)方法检测各治疗组中p16基因甲基化状态。结果:造模20周后,模型组大鼠胃黏膜出现肠化生、不典型增生等病理改变,而益气通络解毒散组胃黏膜病变程度较轻;益气通络解毒散组p16抑癌基因Cp G岛甲基化阳性率为33.33%,与模型组76.92%比较,差异有统计学意义(P0.05)。24例胃黏膜病理为肠上皮化生或异型增生大鼠中,有16例p16抑癌基因启动子区域Cp G岛高甲基化状态;而32例非胃癌前病变大鼠中,有23例p16抑癌基因启动子区域Cp G岛非甲基化。经两变量相关分析检验,Spearman系数为0.383 67,P=0.003 50.01。结论:化瘀解毒益气法对胃癌前病变胃黏膜细胞p16基因有一定的去甲基化作用,可能通过降低p16抑癌基因启动子区域Cp G岛甲基化水平,改善大鼠胃黏膜腺体的破坏,从而发挥其治疗胃癌前病变的作用。     

非小细胞肺癌组织中RASSF_(1A)和p16基因启动子甲基化研究

目的:研究肺癌新型侯选抑癌基因Ras相关结构域家族基因1A(RASSF1A)和p16基因在非小细胞肺癌(NSCLC)中的甲基化情况,揭示两基因表达失活的机制,为NSCLC的基因诊断和治疗寻找新途径。方法:用甲基化特异性PCR(MSP)方法对96例NSCLC患者癌组织及相应的远癌正常肺组织中RASSF1A和p16基因启动子甲基化状态进行检测。结果:(1)96例NSCLC组织RASSF1A甲基化率48.96%,p16基因34.38%,96例远癌正常肺组织均未发现此两基因甲基化。(2)RASSF1A甲基化率鳞癌组(64.29%)高于腺癌组(37.04%,P<0.05);p16基因甲基化率50岁以上组(44.93%)高于50岁以下组(7.41%,P<0.05),鳞癌(61.90%)高于腺癌(12.96%,P<0.05),有淋巴结转移组(46.67%)高于无淋巴结转移组(13.89%,P<0.05)。(3)RASSF1A与p16基因启动子CPG岛甲基化呈正相关(r=0.256,P<0.05)。结论:RASSF1A和p16在NSCLC尤其是鳞癌中频繁甲基化,可能是两基因表达失活的主要原因。     

MSP法检测胃癌的PTEN基因甲基化改变

目的:检测胃癌中抑癌基因PTEN启动子区域甲基化状况,并探讨其甲基化改变的特点与临床病理特征的关系。方法:采用甲基化特异的PCR法(MSP)检测胃癌组织及相应癌旁组织(各35例)中PTEN启动子区域甲基化状态。结果:35例癌旁正常胃组织未发现有PTEN基因启动子的甲基化,16/35例胃癌组织检测到PTEN基因启动子的甲基化,癌组织PTEN基因启动子甲基化率显著增高(P<0.05)。有淋巴结转移的19例胃癌组织中,有12例PTEN基因启动子甲基化,有淋巴结转移的PTEN基因启动子甲基化显著高于无淋巴结转移组(P<0.05)。结论:PTEN基因启动子的甲基化与胃癌的发生、转移相关。甲基化特异的PCR法(MSP)是检测胃癌抑癌基因PTEN启动子区域甲基化状况的一种较新且特异的实验方法,可用于胃癌的辅助诊断和预后判断。     

乳头状甲状腺癌p16基因蛋白表达及启动子甲基化的研究

目的 研究抑癌基因p16在乳头状甲状腺癌中的表达,分析其启动子区甲基化与肿瘤发生的关系.方法 对50例乳头状甲状腺癌组织和32例对照组织(20例结节性甲状腺肿,12例甲状腺腺瘤)提取RNA后,反转录为cDNA,进行PCR,检测p16基因的表达情况,运用巢氏MSP(nMSP)检测上述组织中p16基因启动子区甲基化的情况.结果 p16基因启动子在50例乳头状甲状腺癌中有27例发生甲基化,甲基化率为54%,在32例对照组中有5例发生甲基化,甲基化率为15.6%,两组甲基化率差异有统计学意义(x2=12.08,P<0.01),经DNA测序后证实发生了启动子区甲基化的存在.p16基因在50例乳头状甲状腺癌组织中17例(34%)存在表达缺失,在32例对照组中有6例(18.8%)存在表达缺失,两组差异无统计学意义(x2=2.29, P>0.05),乳头状甲状腺癌mRNA的半定量的值为0.51±0.17,对照组mRNA半定量的值为0.72±0.22,乳头状甲状腺癌mRAN的表达明显低于对照组织,两者差异有统计学意义(t=3.66,P<0.01).结论 p16基因启动子甲基化与乳头状甲状腺癌的发生和发展相关.     

A pilot study on DNA hypermethylation status in promoter region of P16 gene in patients with sporadic breast cancer

BackgroundEpigenetic modification of cancer-related genes plays a role over and above their genetic alterations and contributes to the tumor initiation and progression of breast cancer. Promoter methylation of tumor suppressor genes is one such epigenetic modification, which can be potential biomarker. In this study, promoter methylation status of p16 gene was studied in blood samples of patients with breast carcinoma.MethodsSeventy-five patients, freshly diagnosed with carcinoma of breast and 20 age and sex matched healthy control subjects were recruited for the study. DNA extracted from EDTA blood sample was bisulfite converted and subjected to methylation-specific PCR to amplify the p16 promoter region.ResultsOut of 75 patients, 25 (33%) patients showed hypermethylation in promoter region of p16 gene, which was statistically significant in comparison with the control group (p < 0.05). In subgroup analysis, lymph node involvement, cancer grade, and histopathological finding did not show any difference with methylation status of p16 promoter.ConclusionSignificant hypermethylation of p16 promoter region in the blood of histopathologically proven cases of breast cancer was observed suggesting promoter hypermethylation of p16 may be a possible mechanism accounting for sporadic carcinoma of breast.     

促甲状腺激素受体基因启动子区甲基化与乳头状甲状腺癌的关系研究

目的观察促甲状腺激素受体（TSHR）在乳头状甲状腺癌（PTC）中的表达,分析其基因启动子区甲基化与肿瘤发生的关系。方法选择50例PTC和32例良性甲状腺肿瘤患者（对照组,包括20例结节性甲状腺肿和12例甲状腺腺瘤患者）,对两组患者手术获取的标本提取RNA后,逆转录为cDNA,进行PCR,检测鸭HR基因的表达情况;运用甲基化特异性PCR（MSP）法检测上述组织中TSHR基因启动子区甲基化的情况。结果PTC组患者中,有34例（68．0％）TSHR基因启动子发生甲基化,16例（32．0％）TSHR基因mRNA表达缺失;对照组患者中,有7例（21．9％）TSHR基因启动予发生甲基化,4例（12．5％）TSHR基因mRNA表达缺失,PTC组织TSHR基因启动子区甲基化率及TSHR基因mRNA表达缺失率均显著高于对照组,差异有统计学意义（X^2值分别为16．61和4．02,P〈0．05）。34例发生了TSHR基因启动子区甲基化的PTC患者中,有14例（41．2％）TSHRmRNA表达缺失;16例未发生甲基化的PTC患者中,2例（12．5％）发生了mRNA表达缺失,二者mRNA表达缺失率间差异有统计学意义（X^2=4．11,P〈0．05）。结论PTC患者TSHR基因启动子甲基化发生率显著高于良性甲状腺肿瘤患者,而TSHR基因mRNA的表达则较良性甲状腺肿瘤降低;推测TSHR基因启动子区甲基化可能与PTC的发生、发展相关。     

Epigenetic regulation of putative tumor suppressor TGFBI in human leukemias

Background Both in vitro and in vivo data have demonstrated the TGFBI gene functions as a putative tumor suppressor and is frequently downregulated in human tumors of different histological types.The hypermethylation of the TGFBI promoter,as one of the main regulatory mechanisms,is associated with TGFBI silencing.In this study,we used a methylation-specific PCR （MSP） method to evaluate the methylation status of the TGFBI promoter in human leukemias.Methods Real-time RT-PCR and methylation-specific PCR approaches were performed to define the TGFBI expression and promoter methylation in human leukemia call lines and clinical samples.Genomic DNA was isolated from peripheral blood mononuclear cells from leukemia patients,bisulfite-converted,and analyzed by the MSP method.Results Hypermethylation of the TGFBI promoter occurred in leukemia cell lines and demethylation treatment reexpressed TGFBI at a substantially increased level in most of leukemia cell lines tested.Furthermore,a much higher level of CpG island methylation and a significantly lower TGFBI expression were also identified in clinical leukemia samples.Conclusion The results suggest an important role of promoter methylation in regulating TGFBI expression in leukemia,which provides a useful diagnostic marker for clinical management of human leukemias.     

Trends in suicide ideation, plans, gestures, and attempts in the United States, 1990-1992 to 2001-2003

Context  Little is known about trends in suicidal ideation, plans, gestures, or attempts or about their treatment. Such data are needed to guide and evaluate policies to reduce suicide-related behaviors. Objective  To analyze nationally representative trend data on suicidal ideation, plans, gestures, attempts, and their treatment. Design, Setting, and Participants  Data came from the 1990-1992 National Comorbidity Survey and the 2001-2003 National Comorbidity Survey Replication. These surveys asked identical questions to 9708 people aged 18 to 54 years about the past year’s occurrence of suicidal ideation, plans, gestures, attempts, and treatment. Trends were evaluated by using pooled logistic regression analysis. Face-to-face interviews were administered in the homes of respondents, who were nationally representative samples of US English-speaking residents. Main Outcome Measure  Self-reports about suicide-related behaviors and treatment in the year before interview. Results  No significant changes occurred between 1990-1992 and 2001-2003 in suicidal ideation (2.8% vs 3.3%; P = .43), plans (0.7% vs 1.0%; P = .15), gestures (0.3% vs 0.2%; P = .24), or attempts (0.4%-0.6%; P = .45), whereas conditional prevalence of plans among ideators increased significantly (from 19.6% to 28.6%; P = .04), and conditional prevalence of gestures among planners decreased significantly (from 21.4% to 6.4%; P = .003). Treatment increased dramatically among ideators who made a gesture (40.3% vs 92.8%) and among ideators who made an attempt (49.6% vs 79.0%). Conclusions  Despite a dramatic increase in treatment, no significant decrease occurred in suicidal thoughts, plans, gestures, or attempts in the United States during the 1990s. Continued efforts are needed to increase outreach to untreated individuals with suicidal ideation before the occurrence of attempts and to improve treatment effectiveness for such cases.      

Progression of solitary and multifocal papillary thyroid carcinoma — a retrospective study of 368 patients

Background  Papillary thyroid carcinoma (PTC) represents one of the most frequent endocrine malignancies. Several factors have been found to be involved in determining the outcome of treatment for patients with PTC. Large tumor size, diagnosis at an early age, extra-thyroidal invasion, aggressive histological variants, and distant metastases are the most important determinants of a poor outcome. BRAF^V600E mutation has been found to be a major genetic alteration in PTC. This study aimed to evaluate progression in patients with multifocal and solitary PTC.

Methods  We performed a retrospective study to analyze 368 patients with PTC who underwent surgery, including 282 patients with solitary PTC and 86 patients with multifocal PTC. The status of BRAF^V600E mutation in all tumor foci from multifocal PTC was detected.

Results  Our study suggested that multifocal PTC was more related to lymph node metastasis and vascular invasion than solitary PTC. However, the distant metastasis rate and 10-year survival rate showed no difference between these two groups. The number of tumor foci did not affect progression of disease in multifocal PTC patients. Lymph node metastasis in multifocal PTC patients was associated with larger tumors, diagnosis at early stage, and extra-thyroidal invasion.

Conclusion  The status of BRAF^V600E mutation was more frequent in multifocal PTC patients with lymph node metastasis and diagnosis at later age.

     

甲状腺乳头状癌与基质金属蛋白酶抑制因子3（TIMP3）基因启动子甲基化的关系研究

目的 研究基质金属蛋白酶抑制因子3（TIMP3）基因启动子甲基化水平与甲状腺乳头状癌发生的内在联系,建立基于启动子高甲基化抑癌基因的甲状腺乳头状癌早期诊断方法 。方法 收集甲状腺手术切除的组织标本共46例,其中甲状腺乳头状癌（Papillary thyroid carcinoma,PTC）29例,结节性甲状腺肿（nodular goiter）17例。经提取DNA,设计并合成BSP引物,PCR扩增,采用亚硫酸氢盐法克隆测序（bisulfite sequencing）和Sequenom Mass ARRAY甲基化DNA定量分析法检测甲状腺乳头状癌组织TIMP3基因启动子CpG片段的甲基化水平。结果 亚硫酸盐修饰测序结果 显示TIMP3基因在甲状腺乳头状癌组织中的高甲基化克隆百分比为70％,显著高于结节性甲状腺肿的0％（P〈0．05）。TIMP3基因启动子区5个CpG位点在甲状腺乳头状癌组织中的甲基化有呈较高的甲状腺乳头状癌特异性。Sequenom Mass ARRAY提供的单一CpG位点甲基化定量数据显示TIMP3基因在甲状腺乳头状癌组织的甲基化率均值（0．28）高于结节性甲状腺肿的甲基化率均值（0．15）,差异有统计学意义（P〈0．05）。TIMP3基因启动子3个CpG位点在甲状腺乳头状癌组织中的甲基化率均值高于结节性甲状腺肿甲基化率,差异有统计学意义（P〈0．05）。结论 TIMP3基因CpG-16及CpG-17位点可能为甲状腺乳头状癌的启动子甲基化检测的关键位点,有望成为甲状腺癌早期诊断的分子标志物。     

Effect of frequent nocturnal hemodialysis vs conventional hemodialysis on left ventricular mass and quality of life: a randomized controlled trial

Context  Morbidity and mortality rates in hemodialysis patients remain excessive. Alterations in the delivery of dialysis may lead to improved patient outcomes. Objective  To compare the effects of frequent nocturnal hemodialysis vs conventional hemodialysis on change in left ventricular mass and health-related quality of life over 6 months. Design, Setting, and Participants  A 2-group, parallel, randomized controlled trial conducted at 2 Canadian university centers between August 2004 and December 2006. A total of 52 patients undergoing hemodialysis were recruited. Intervention  Participants were randomly assigned in a 1:1 ratio to receive nocturnal hemodialysis 6 times weekly or conventional hemodialysis 3 times weekly. Main Outcome Measures  The primary outcome was change in left ventricular mass, as measured by cardiovascular magnetic resonance imaging. The secondary outcomes were patient-reported quality of life, blood pressure, mineral metabolism, and use of medications. Results  Frequent nocturnal hemodialysis significantly improved the primary outcome (mean left ventricular mass difference between groups, 15.3 g, 95% confidence interval [CI], 1.0 to 29.6 g; P = .04). Frequent nocturnal hemodialysis did not significantly improve quality of life (difference of change in EuroQol 5-D index from baseline, 0.05; 95% CI, –0.07 to 0.17; P = .43). However, frequent nocturnal hemodialysis was associated with clinically and statistically significant improvements in selected kidney-specific domains of quality of life (P = .01 for effects of kidney disease and P = .02 for burden of kidney disease). Frequent nocturnal hemodialysis was also associated with improvements in systolic blood pressure (P = .01 after adjustment) and mineral metabolism, including a reduction in or discontinuation of antihypertensive medications (16/26 patients in the nocturnal hemodialysis group vs 3/25 patients in the conventional hemodialysis group; P < .001) and oral phosphate binders (19/26 patients in the nocturnal hemodialysis group vs 3/25 patients in the conventional dialysis group; P < .001). No benefit in anemia management was seen with nocturnal hemodialysis. Conclusion  This preliminary study revealed that, compared with conventional hemodialysis (3 times weekly), frequent nocturnal hemodialysis improved left ventricular mass, reduced the need for blood pressure medications, improved some measures of mineral metabolism, and improved selected measures of quality of life. Trial Registration  isrctn.org Identifier: ISRCTN25858715      

ASC和p16基因启动子甲基化与非小细胞肺癌发生发展的关系

目的 探讨ASC和p16基因启动子甲基化与非小细胞肺癌发生发展的关系.方法 应用甲基化特异性PCR（MSP）检测非小细胞肺癌中ASC和p16基因启动子的甲基化发生率.结果 48例非小细胞肺癌中ASC和p16基因启动子甲基化的发生率分别为47.9%和37.5%,显著高于癌旁正常组织（P＜0.001）;重度吸烟患者的肿瘤组织中ASC和p16基因启动子甲基化的发生率明显增高（P＜0.05）;ASC基因启动子甲基化在较小的肿瘤组织中的有较高的发生率（P＜0.05）.而且,重度吸烟患者的正常肺组织中亦可检测到ASC基因启动子的甲基化.结论 ASC和p16基因启动子的甲基化在非小细胞肺癌中有较高的发生率.ASC基因启动子的频繁甲基化可能与吸烟引起的非小细胞肺癌有关,并且ASC基因甲基化有可能是非小细胞肺癌发展过程中的一个早期事件。