高分辨率熔解曲线分析技术检测血清游离DNA的EGFR基因突变

目的利用高分辨率熔解曲线分析技术(high resolution melting,HRM)检测石蜡包埋组织和血清游离DNA的表皮生长因子受体(epidermal growth factor receptor,EGFR)基因突变,分析两者之间的关系,并探讨其临床应用价值。方法利用HRM技术检测EGFR基因突变的方法,检测200例非小细胞肺癌患者石蜡包埋标本和200例相应的血清游离DNA,并将二者结果进行比较分析。结果HRM法检测非小细胞肺癌患者石蜡包埋组织DNA的EGFR基因突变总检出率为43.5%,血清游离DNA的EGFR基因突变总检出率为25.0%,HRM法检测血清游离DNA的EGFR基因突变与检测石蜡包埋组织DNA的EGFR基因突变相比,敏感性为57.5%,特异性为100%。结论 HRM法检测血清游离DNA的EGFR基因突变为无法获取肿瘤组织标本的患者提供了新的检测机会。     

Direct serum and tissue assay for EGFR mutation in non-small cell lung cancer by high-resolution melting analysis

Biological therapy with epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) have noted promising outcomes for patients with non-small cell lung carcinoma (NSCLC), especially those with mutated EGFR. Tissue EGFR gene mutation testing can predict the benefit of taking a first-line EGFR-TKI, thus, allowing the physician to prescribe the most suitable therapy. Unfortunately, most lung cancer patients, especially NSCLC patients present with advanced disease that is surgically unresectable. The goal of this study was to develop high-resolution melting (HRM) assays to detect EGFR mutations in exons 18 to 21, compare their sensitivity and concordance to direct sequencing, and evaluate the feasibility and reliability of serum as a tissue alternate for routine EGFR mutation screening. EGFR mutations of 126 Formalin-Fixed Paraffin-Embedded (FFPE), 47 fresh frozen tissues and from 47 matched pre-operation serum specimens of NSCLC patients were screened by the HRM assays. EGFR mutations by HRM were confirmed through sequencing. We found 78 EGFR mutations in 70 FFPE tissues, 25 EGFR mutations in 24 fresh frozen tissues, with a mutation rate of 55.56% (70/126) and 51.06% (24/47), respectively. Most mutations were correctly identified by sequencing. EGFR mutations were detected in 22 serum samples from 24 tissue EGFR mutation-positive patients. The concordance rate between serum and tissue in EGFR mutation screening was 91.67%. We conclude that the HRM assay can provide convincing and valuable results both for serum and tissues samples, thus, it is suitable for routine serum EGFR mutation screening for NSCLC patients, especially those surgically unresectable.     

Dramatic reduction of sequence artefacts from DNA isolated from formalin-fixed cancer biopsies by treatment with uracil- DNA glycosylase

Non-reproducible sequence artefacts are frequently detected in DNA from formalinfixed and paraffin-embedded (FFPE) tissues. However, no rational strategy has been developed for reduction of sequence artefacts from FFPE DNA as the underlying causes of the artefacts are poorly understood. As cytosine deamination to uracil is a common form of DNA damage in ancient DNA, we set out to examine whether treatment of FFPE DNA with uracil-DNA glycosylase (UDG) would lead to the reduction of C>T (and G>A) sequence artefacts. Heteroduplex formation in high resolution melting (HRM)-based assays was used for the detection of sequence variants in FFPE DNA samples. A set of samples that gave false positive HRM results for screening for the E17K mutation in exon 4 of the AKT1 gene were chosen for analysis. Sequencing of these samples showed multiple non-reproducible C:G>T:A artefacts. Treatment of the FFPE DNA with UDG prior to PCR amplification led to a very marked reduction of the sequence artefacts as indicated by both HRM and sequencing analysis, indicating that uracil lesions are the major cause of sequence artefacts. Similar results were shown for the BRAF V600 region in the same sample set and EGFR exon 19 in another sample set. UDG treatment specifically suppressed the formation of artefacts in FFPE DNA as it did not affect the detection of true KRAS codon 12 and true EGFR exon 19 and 20 mutations. We conclude that uracil in FFPE DNA leads to a significant proportion of sequence artefacts. These can be minimised by a simple UDG pretreatment which can be readily carried out, in the same tube, as the PCR immediately prior to commencing thermal cycling. HRM is a convenient way of monitoring both the degree of damage and the effectiveness of the UDG treatment. These findings have immediate and important implications for cancer diagnostics where FFPE DNA is used as the primary genetic material for mutational studies guiding personalised medicine strategies and where simple effective strategies to detect mutations are required.     

高分辨率熔解曲线分析技术检测EGFR基因突变方法的建立及其初步临床应用

目的建立高分辨率熔解曲线(high resolution melting,HRM)分析技术检测表皮生长因子受体(epidermal growth factor receptor,EGFR)基因突变的方法,并探讨其的临床应用价值。方法建立HRM技术检测EGFR基因突变方法,并用其检测200例非小细胞肺癌患者肿瘤石蜡包埋标本,并与测序法的结果进行比较。结果所建HRM检测方法 Tm与ct值的CV值均较小,重复性好。HRM法检测标本EGFR基因突变的结果与测序法相比,突变总检出率分别为40.0%和37.0%,敏感性为100%,特异性>95%。结论 HRM法检测EGFR基因突变,敏感性高,特异性强,重复性好,操作简便,节约时间,成本低,适用于临床。     

竞争性等位基因特异性荧光探针聚合酶链法检测肺腺癌组织 EGFR 基因突变

目的：探讨竞争性等位基因特异性荧光探针聚合酶链（castPCR）法检测初治肺腺癌组织表皮生长因子受体（EGFR）基因突变的应用价值,及 EGFR 突变状态与患者临床生物学行为的相关性。方法：收集2010年10月至2014年12月南京鼓楼医院103例初治肺腺癌组织标本及患者的临床病理资料。使用 castPCR 法检测 EGFR 基因突变（外显子19 del 2235-2249和 del 2236-2250、外显子20 T790M、外显子21 L858R）。结果：103例肺腺癌患者肿瘤组织中共有54例检出了存在至少一个位点的 EGFR 基因突变（突变率52.43%）,其中敏感突变（外显子19和/或外显子21）45人（43.69%）,外显子20突变11人（10.68%）。同时发现部分患者存在敏感突变与敏感突变、敏感突变与耐药突变共存的现象,其中外显子19和20共突变2人,外显子19和21共突变4人,外显子20和21共突变1人。结论：通过对103例肺腺癌患者肿瘤组织 EGFR 基因突变状态的检测,初步论证了 castPCR 法在肺癌 EGFR 驱动突变检测方面的临床可行性。     

Comparison of Two Methods to Extract DNA from Formalin- Fixed,Paraffin-Embedded Tissues and their Impact on EGFR Mutation Detection in Non-small Cell Lung Carcinoma

Objective: Molecular pathology tests are often carried for clinicopathological diagnosis and pathologists haveestablished large collections of formalin-fixed, paraffin-embedded tissue (FFPE) banks. However, extraction ofDNA from FFPE is a laborious and challenging for researchers in clinical laboratories. The aim of this studywas to compare two widely used DNA extraction methods: using a QIAamp DNA FFPE kit from Qiagen and aCobas Sample Preparation Kit from Roche, and evaluated the effect of the DNA quality on molecular diagnostics.Methods: DNA from FFPE non-small cell lung carcinoma tissues including biopsy and surgical specimens wasextracted with both QIAamp DNA FFPE and Cobas Sample Preparation Kits and EGFR mutations of nonsmallcell lung carcinomas were detected by real-time quantitative PCR using the extracted DNA. Results andConclusion: Our results showed that DNA extracted by QIAamp and Cobas methods were both suitable to detectdownstream EGFR mutation in surgical specimens. Howover, Cobas method could yield more DNA from biopsyspecimens, and gain much better EGFR mutation results.     

HRM法检测肺癌EGFR基因突变

目的：HRM法检测中国不同区域肺癌患者的EGFR基因突变,统计突变类型间比率,为临床EGFR-TKI分子靶向治疗提供依据,并验证HRM法的临床适用性。方法：收集2010年手术切除的肺癌石蜡标本253例,HRM法检测EGFR基因突变情况,并用基因测序法进行验证。结果：在253例肺癌标本中,HRM法检测出EGFR基因突变率为42%,与基因测序法检测出的突变率40%无显著性差异,并检测出2例T790M突变,11例多点突变和2例E18新位点突变。将本实验中收集的东部地区和非东部地区肺癌患者的EGFR基因突变率相比较,无显著性差异。经实验验证,HRM法的灵敏度高于基因测序的灵敏度,且HRM法的特异性为100%。结论：HRM技术具有高灵敏度、高特异性和高准确率等特点,且比基因测序法更简单方便,成本更低,适合在临床开展。明确EGFR突变类型十分必要,可以为临床可否运用EGFR-TKI分子靶向治疗提供重要依据。本实验中收集的肺癌标本EGFR基因突变不存在地域差异。     

HRM法检测肺癌EGFR基因突变

目的:HRM法检测中国不同区域肺癌患者的EGFR基因突变,统计突变类型间比率,为临床EGFR-TKI分子靶向治疗提供依据,并验证HRM法的临床适用性。方法:收集2010年手术切除的肺癌石蜡标本253例,HRM法检测EGFR基因突变情况,并用基因测序法进行验证。结果:在253例肺癌标本中,HRM法检测出EGFR基因突变率为42%,与基因测序法检测出的突变率40%无显著性差异,并检测出2例T790M突变,11例多点突变和2例E18新位点突变。将本实验中收集的东部地区和非东部地区肺癌患者的EGFR基因突变率相比较,无显著性差异。经实验验证,HRM法的灵敏度高于基因测序的灵敏度,且HRM法的特异性为100%。结论:HRM技术具有高灵敏度、高特异性和高准确率等特点,且比基因测序法更简单方便,成本更低,适合在临床开展。明确EGFR突变类型十分必要,可以为临床可否运用EGFR-TKI分子靶向治疗提供重要依据。本实验中收集的肺癌标本EGFR基因突变不存在地域差异。     

含有少量腺癌成分的肺鳞状细胞癌（SQCC-mGC）基因突变分析

目的:检测SQCC-mGC中的致癌基因突变,以期指导肺鳞癌靶向治疗患者的筛选。方法:用HRM技术检测100例病理确诊的肺鳞癌标本中肺癌驱动基因。结果:与单纯SQCC组相比,SQCC-mGC组带有已知致癌基因突变的比例更高（23.3% vs 4.3%）,差异具有统计学意义(P＜0.001)。结论:EGFR、ALK或KRAS基因突变在SQCC-mGC中出现频率较高,在治疗前对SQCC-mGC患者进行致癌基因突变检测,有助于筛选靶向治疗的潜在受益人群。     

血清循环DNA的EGFR基因突变与肺癌选择性靶向治疗研究

目的:通过血清循环DNA的基因突变检测,筛选EGFR突变型肺癌患者并评估靶向性药物吉非替尼对其的临床疗效。方法:从肺癌患者血清中提取DNA,采用PCR扩增和基因测序检测EGFR突变。结果:116例肺癌血样中检出EGFR突变46例,突变率为39.7%,其中外显子19和21突变分别占65.2%(30/46例)和34.8%(16/46例),EGFR基因突变多见于女性患者和肺腺癌(包括腺鳞癌)患者。对20例肺癌的进一步分析证明,血清EGFR基因突变类型与患者自身肿瘤的突变类型相同。另外通过血清循环DNA基因检测法筛选了19例化疗失败的突变型晚期肺癌进行吉非替尼靶向治疗,客观有效率为52.6%,病情控制率为89.5%,中位无进展生存时间为8个月,中位生存时间为12个月,2年生存率达到33.3%。结论:证实血清循环DNA与肿瘤组织DNA的EGFR基因突变一致;以血清循环EGFR突变检测结果为依据选择分子靶向性药物吉非替尼治疗,对晚期肺癌患者疗效明显。     

Targeted sequencing with enrichment PCR: a novel diagnostic method for the detection of EGFR mutations

Epidermal growth factor receptor (EGFR) is an important mediator of tumor cell survival and proliferation. The detection of EGFR mutations can predict prognoses and indicate when treatment with EGFR tyrosine kinase inhibitors should be used. As such, the development of highly sensitive methods for detecting EGFR mutations is important. Targeted next-generation sequencing is an effective method for diagnosing mutations. We compared the abilities of enrichment PCR followed by ultra-deep pyrosequencing (UDP), UDP alone, and PNA-mediated RT-PCR clamping to detect low-frequency EGFR mutations in tumor cell lines and tissue samples. Using enrichment PCR-UDP, we were able to detect the E19del and L858R mutations at minimum frequencies of 0.01% and 0.05%, respectively, in the PC-9 and H197 tumor cell lines. We also confirmed the sensitivity of detecting the E19del mutation by performing a titration analysis in FFPE tumor samples. The lowest mutation frequency detected was 0.0692% in tissue samples. EGFR mutations with frequencies as low as 0.01% were detected using enrichment PCR-UDP, suggesting that this method is a valuable tool for detecting rare mutations, especially in scarce tissue samples or those with small quantities of DNA.     

HRM方法检测肺腺癌患者癌性胸水上清液EGFR基因突变的临床意义

目的:探讨应用HRM方法检测肺腺癌患者癌性胸水上清液EGFR基因突变状况及EGFR酪氨酸激酶受体抑制剂治疗的可行性。方法:收集43例肺腺癌患者癌性胸水上清液标本,提取DNA,应用HRM方法检测EGFR基因第18、19、20、21外显子突变状况。统计分析HRM方法与基因测序法检测EGFR突变率的差异。结果:43例肺腺癌患者癌性胸水上清液中,HRM法检测EGFR基因突变共17例,总突变率为39.53%,其中第19外显子突变14例,第21外显子突变3例。基因测序结果显示:EGFR突变14例,总突变率为32.56%,均为第19外显子突变。HRM方法检测第21外显子突变阳性的患者其基因测序结果均为阴性。这可能与HRM方法检测的灵敏度优于测序方法有关。两者突变率差异无统计学意义（P>0.05）。结论:对难以获取组织标本的肺腺癌患者而言,应用HRM方法检测其癌性胸水上清液,是了解其EGFR基因突变状况的可靠途径,对临床筛查靶向治疗药物具有一定的参考价值。     

肺腺癌患者外周血中外泌体EGFR突变检测及其临床意义北大核心

目的:探讨肺腺癌患者外周血中外泌体检测EGFR的临床意义。方法:采用PCR方法检测肺腺癌患者外周血中外泌体、ctDNA和癌组织中EGFR突变情况,分析肺腺癌患者外周血外泌体中EGFR突变及其与临床病理特征的关系,比较外周血中外泌体、ctDNA和癌组织中检测EGFR突变的一致性。结果:肺腺癌患者外周血外泌体中检测EGFR突变型肺腺癌21例,EGFR野生型肺腺癌23例。肺腺癌外泌体中EGFR突变与性别、年龄、肿瘤大小、TNM分期、组织学类型及淋巴结转移情况比较差异无统计学意义(P>0.05)。肺腺癌组织检测25例EGFR突变中,外泌体中检测出EGFR突变19例,一致率为76%;19例肺腺癌组织EGFR野生型中,外泌体检测出EGFR突变2例。25例肺腺癌组织EGFR突变中,ctDNA中检测出EGFR突变16例,一致率为64%。kappa分析显示,外泌体、ctDNA与癌组织检测一致性较好,前者一致性优于后者。结论:外泌体可用于肺腺癌血浆中EGFR突变检测,对指导临床用药具有一定意义。     

变性高效液相色谱法分析中国人非小细胞肺癌、结直肠癌中表皮生长因子受体突变情况和临床意义

目的初步了解我国NSCLC和结直肠癌患者EGFR突变的发生率及与此相关的临床特征。方法利用含有野生型和突变型EGFR基因的质粒DNA,摸索条件,建立DHPLC最佳检测方法;收集北京协和医院近期NSCLC手术标本和结直肠癌的石蜡标本,通过PCR和DHPLC筛查突变,测序验证,并对结果进行统计学分析。结果在29例NSCLC标本中,8例发生突变,突变率为27·6%,其中6例为缺失突变、1例为点突变、1例为混合突变;8例女性中有7例发现突变,突变率为87·5%,而21例男性病人中只有1例发生突变,突变发生率为4·8%(P<0·001);8例无吸烟史的病人全部突变,突变发生率为100%,21例有吸烟史的病人无1例突变(P<0·001);20例腺癌病人中有8例突变,突变率为40·0%;9例鳞癌病人无一突变(P=0·026);肿瘤家族史和肿瘤分期则与突变无关。在37例结直肠癌标本中,未发现突变。结论中国人NSCLC的EGFR突变发生率明显高于欧美国家,且以19外显子上的缺失突变为主。突变发生与女性、无吸烟史和腺癌有相关性,与肿瘤家族史和肿瘤分期没有相关性。结直肠癌EGFR未发现突变。DHPLC可作为EGFR突变筛查方法。     

组织样本保存状态及时间对EGFR基因突变检测结果的影响

目的 探讨不同组织保存状态（原始样本或基因组DNA）及保存时间对非小细胞肺癌（NSCLC）中表皮生长因子受体（EGFR）基因突变检测结果的影响。方法 收集EGFR基因突变阳性NSCLC患者的新鲜冰冻组织和石蜡包埋（FFPE）组织各10例,每保存1个月提取1次DNA（共12次）,设为冰冻新提取组和FFPE新提取组;同时分别选取初检后剩余基因组DNA作对照,设为冰冻预留组和FFPE预留组。分别采用检测试剂盒定性和定量检测上述4组EGFR基因的突变情况,同时采用荧光定量PCR技术检测内参基因的Ct值。比较4组不同保存时间的内参基因Ct值和EGFR基因突变频度情况。结果 20例原始组织样本均可以检出EGFR基因突变,与临床信息相符。新鲜冰冻组织、FFPE组织的DNA浓度均＞50ng／μl,且A260／A280为1.8±0.2。新鲜冰冻组织保存10个月后,冰冻预留组的内参基因Ct值高于冰冻新提取组,差异有统计学意义（P＜0.05）;FFPE保存12个月内,FFPE新提取组和FFPE预留组内参基因Ct值的差异均无统计学意义（P＞0.05）。冰冻新提取组保存6个月后和FFPE新提取组保存4个月后的EGFR基因突变频度高于对应预留组,差异均有统计学意义（P＜0.05）。结论 原始样本相对于预留基因组DNA更适合用于回顾性研究的材料。     

Rapid Detection of N-RAS Gene Common Mutations in Acute Myeloid Leukemia (AML) Using High Resolution Melting (HRM) Method

Objective: Acute myeloid leukemia is caused by the clonal proliferation of undifferentiated myeloid hematopoietic precursors. AML prognosis is highly involved in the treatment response and is determined by mutations in several genes such as N-RAS. This study aims to identify the distribution of common N-RAS mutations (codons 12, 13, and 61) in AML patients using the HRM method and confirm this method’s efficiency for mutation detection by comparing its results with the sequencing data as the Gold standard method. Methods: Peripheral blood samples were taken from 50 newly diagnosed AML patients. Mononuclear cells were isolated from samples, and DNA was extracted. Then, mutation detection was investigated using the HRM method. Efficacy of the HRM method in mutation detection was determined in comparison with direct sequencing. Results: N-RAS mutations were detected in 7 of the 50 samples (14%). Most of the mutations were found in codon 12 (57.14%), and 28.57% and 14.28% of mutations were in codons 61 and 13, respectively. There was no statistically significant association between patients’ demographic data and HRM results. Conclusion: According to mutation detection results and the HRM results confirmation with the sequencing method, this method can be introduced as an efficient, low-cost, and fast method for detecting common mutations.     

Comparison of High-Resolution Melting (HRM) Analysis with Direct Sequencing for the Detection of DNMT3A Mutations in AML Patients

Objective: Acute myeloid leukemia (AML) is caused by abnormal gene expression following mutations. Many of the mutations in AML lead to gene instability and poor response to treatment. Among these mutations, DNMT3A mutation is exceedingly important due to its major role in methylation and its effect on the expression of other genes. Aberrant methylation due to DNMT3A mutations that mostly occur in exon 23, affects the overall survival (OS) of patients with AML and myelodysplastic syndromes (MDS) showing the importance of identification of these mutations. According to the association of these mutations with short overall survival and disease progression in AML patients, we aimed to investigate DNMT3A gene exon 23 mutations using HRM. Methods: Fifty peripheral blood samples were taken from patients with AML. Mononuclear cells were isolated by ficoll method, and DNA was extracted. Then, mutation detection was detected using the HRM method. Efficacy of the HRM method in mutation detection was compared with direct sequencing method as gold standard. Results: Mutations in codon 23 of the DNMT3A gene were detected in 5 patients (10%). All of the detected mutations were missense type. A comparison between direct sequencing and HRM analysis demonstrated full concordance of mutation detection. Conclusion: According to the full consistency between the HRM and direct sequencing methods, HRM is suggested to be adopted as an alternative for the common time-consuming methods in detecting the gene mutations.     

Super-ARMS法检测肺腺癌患者血浆循环肿瘤DNA表皮生长因子受体T790M基因突变的临床研究

  目的  探讨真实世界中Super-ARMS法检测肺腺癌患者外周血标本循环肿瘤脱氧核糖核酸（circulating tumor DNA,ctDNA）中表皮生长因子受体（epidermal growth factor receptor,EGFR）T790M基因突变的临床应用价值。  方法  收集2019年1月至2020年6月在首都医科大学附属北京胸科医院确诊的肺腺癌患者307例,突变扩增系统（amplification refractory mutation system, ARMS）检测组织中EGFR基因突变情况,Super-ARMS法检测血浆中EGFR的基因突变情况。通过生存分析比较不同标本检测EGFR T790M基因突变患者的无进展生存时间（progression-free survival,PFS）。  结果  153例患者疾病进展接受再活检。74例进行组织再活检,其中34例（45.9%）检测到EGFR T790M基因突变。141例患者进行液体再活检,其中51例（36.2%）EGFR T790M基因突变。Kaplan-Meier生存分析显示,组织和外周血EGFR T790M突变阳性患者接受第三代EGFR酪氨酸激酶抑制剂（EGFR-tyrosine kinase inhibitors,EGFR-TKIs）的中位PFS比较差异无统计学差异（16.3个月 vs. 11.4个月,x2=1.138,P>0.05）。组织和外周血EGFR T790M突变阴性患者未接受第三代EGFR-TKIs治疗的中位PFS比较差异无统计学意义（7.0个月 vs. 7.0个月,x2=0.470,P>0.05）。  结论  真实世界中Super-ARMS法检测外周血标本有望应用于检测EGFR T790M 基因突变情况,外周血标本可一定程度上补充组织标本检测EGFR T790M基因突变结果,预测患者对第三代EGFR-TKIs治疗的疗效。      

Analysis of ctDNA to predict prognosis and monitor treatment responses in metastatic pancreatic cancer patients

Cell‐free circulating tumor DNA (ctDNA) in plasma has been used as a potential noninvasive biomarker for various tumors. Our study was performed to evaluate the clinical implications of ctDNA detection in patients with metastatic pancreatic cancer. First, we attempted to prospectively screen a panel of 60 genes in cell‐free DNA (cfDNA) from ten metastatic pancreatic cancer patients via exome sequencing. Second, droplet digital PCR (ddPCR) was used to identify potential mutations in a cohort of 188 patients with metastatic pancreatic cancer. Finally, to preliminary evaluate the potential role of ctDNA in monitoring tumor responses following chemotherapy, we detected the presence of ctDNA in serial plasma samples from 13 metastatic pancreatic cancer patients (Clinical trial: NCT02017015). The analysis revealed five somatic mutations at BRCA2, EGFR, KDR and ERBB2 gene loci. The frequencies of ctDNA mutation at BRCA2, KDR, EGFR, ERBB2 exon17 and ERBB2 exon27 were 11.7%, 13.8%, 13.3%, 13.3% and 6.4% respectively. Univariate and multivariate analyses identified the ERBB2 exon17 mutation (p = 0.035, HR = 1.61) as an independent factor associated with overall survival among metastatic pancreatic cancer patients. Furthermore, the rate of coincident detection of ctDNA and response to treatment as assessed by CT imaging was 76.9% (10 of 13 cases), and the presence of ctDNA provided the earliest measure of treatment in 6 of 10 patients (60%). ctDNA sequencing may have clinical value for determining metastatic pancreatic cancer treatment and monitoring the tumor response.     

NSCLC EGFR突变与吸烟的交互作用及其与miR-221表达的相关性

目的:分析NSCLC EGFR突变与吸烟等因素的交互作用,及其与miR-221表达的相关性,为肺癌分子机制研究提供线索和依据。方法:采用高分辨熔解曲线法（high resolution melting,HRM）进行EGFR突变检测,以EGFR突变阳性为病例组,野生型为对照组,logistic回归分析EGFR突变与吸烟等因素在肺癌中的交互作用,Spearman分析EGFR突变与miR-221表达的相关性。结果:吸烟者相对于不吸烟者,EGFR突变差异具有统计学意义（P=0.034）,不吸烟者EGFR突变率较高。性别、年龄、饮酒、组织学类型、肿瘤直径、TNM分期、分化程度、肿瘤家族史以及心脑血管疾病史与EGFR突变无统计学关系（P＞0.05）;NSCLC EGFR突变与吸烟、饮酒、肿瘤家族史以及心脑血管疾病史对肺癌的发生不存在相乘交互作用;miR-221表达在NSCLC组织明显高于非癌肺组织,差异有统计学意义（P=0.017）;EGFR突变与miR-221表达无相关性（r=-0.034,P=0.858）。结论:NSCLC EGFR突变与吸烟、饮酒、肿瘤家族史及心脑血管疾病史均不存在相乘交互作用,miR-221表达在NSCLC组织中高于非癌病人肺组织,与EGFR突变无相关性。