Glutathione S-transferase M1 Gene Polymorphism in Thai Nasopharyngeal Carcinoma

Nasopharyngeal carcinoma (NPC) is a serious health problem in Thailand. It is caused by the combined effects of ‍Epstein-Barr virus (EBV), carcinogens and genetic susceptibility. The glutathione S-transferase M1 gene (GSTM1) ‍encodes a phase II enzyme responsible for detoxifying carcinogenic electrophiles. Polymorphic null forms of the ‍gene GSTM1 lack enzyme activity and have been associated with susceptibility to several cancers including NPC. To ‍examine the association between GSTM1 polymorphism and NPC susceptibility in Thais, GSTM1 genotypes (normal ‍and null genotypes) in 78 NPC patients and 145 age-matched healthy controls were determined using PCR assays. ‍Overall, no statistically significant differences were observed in the frequency of GSTM1 genotypes between cases ‍and controls, nor among NPC patients compared on the basis of sex and clinical stage of disease. Carriers with the ‍GSTM1 null genotype had a 2.9-fold increased risk for NPC of WHO type III when compared to those with GSTM1 ‍normal genotype (P < 0.05 with OR =2.9, 95% CI = 1.2-6.8). When cases and controls were categorized into 3 age ‍groups (>40, >45 and >50 years), the frequencies of GSTM1 null genotype in cases the >45 and >50 age groups were ‍significantly different from controls (P < 0.05). In addition, carriers of the GSTM1 null genotype in age groups >45 ‍and >50 years had a 2-fold and 3-fold increased risk for NPC when compared to those with GSTM1 normal genotype ‍(OR = 2.2, 95% CI = 1.1-4.7 and OR = 3.0, 95% CI = 1.2-7.5). We suggest that GSTM1 polymorphism may be ‍associated with NPC susceptibility in Thais, especially for GSTM1 null genotype carriers of age higher than 45 years. ‍The GSTM1 null genotype may be a useful genetic marker for predicting Thai NPC and for screening of early stages ‍of Thai NPC.     

Association of matrix metalloproteinase-8 gene variation with breast cancer prognosis

Animal and cell studies indicate an inhibitory effect of matrix metalloproteinase-8 (MMP8) on tumorigenesis and metastasis. We investigated whether MMP8 gene variation was associated with breast cancer metastasis and prognosis in humans. We first studied nine tagging single nucleotide polymorphisms (SNP) in the MMP8 gene in 140 clinically and pathologically well-characterized breast cancer patients. Four of the SNPs were found to be associated with lymph node metastasis, the most pronounced being a promoter SNP (rs11225395) with its minor allele (T) associating with reduced susceptibility to lymph node metastasis (P = 0.02). This SNP was further evaluated for association with cancer relapse and survival among a cohort of approximately 1,100 breast cancer patients who had been followed for cancer recurrence and mortality for a median of 7.1 years. The T allele was associated with reduced cancer relapse and greater survival, particularly among patients with earlier stage cancer. Among patients of tumor-node-metastasis stage 0 to II, the adjusted hazard ratio of disease-free survival was 0.7 [95% confidence interval (95% CI), 0.5-0.9] for patients carrying T allele compared with those homozygous for the C allele (P = 0.02). In vitro experiments showed that the T allele had higher promoter activity than the C allele in breast cancer cells. Electrophoretic mobility shift assays showed binding of nuclear proteins to the DNA sequence at the SNP site of the T allele but not that of the C allele. The data suggest that MMP8 gene variation may influence breast cancer prognosis and support the notion that MMP8 has an inhibitory effect on cancer metastasis.     

Association of variants in the interleukin‐27 and interleukin‐12 gene with nasopharyngeal carcinoma

Nasopharyngeal carcinoma (NPC) is multifactorial, and the genetic background may be a crucial etiologic factor. Interleukin‐12 (IL‐12) is a multifunctional cytokine that induces interferon (IFN)‐gamma secretion and plays an important role in antitumor immunity. Interleukin‐27 (IL‐27) is a novel IL‐12 family member, the present studies demonstrate that IL‐27 mediates potent antitumor activity. Variations in the DNA sequence in the IL‐12 and IL‐27 gene may lead to altered cytokines production and/or activity, and so this can modulate an individual's susceptibility to NPC. To test this hypothesis, we investigated the relationship of IL‐12 and IL‐27 gene polymorphisms and NPC in a Chinese population. We analyzed single nucleotide polymorphisms (SNPs) of IL‐12 gene 16974 A/C and IL‐27 gene ?964 A/G, 2905 T/G, 4730 T/C in 302 patients with NPC and 310 age‐ and sex‐matched controls, using polymerase chain reaction–restriction fragment length polymorphism (PCR–RFLP) and DNA sequencing methods. There were significant differences in the genotype and allele distribution of 16974 A/C polymorphism of the IL‐12 gene among cases and controls. The 16974 CC and AC genotypes were associated with a significantly increased risk of NPC as compared with the 16974 AA genotypes (OR = 2.225, 95% CI 1.395–3.549, P = 0.001 and OR = 1.834, 95% CI 1.239–2.716, P = 0.002, respectively). The 16974 C allele was associated with a significantly increased risk of NPC as compared with the 16974 A allele (OR = 1.334, 95% CI 1.065–1.670, P = 0.012). However, genotype and allele frequencies of the IL‐27 gene ?964 A/G, 2905 T/G, 4730 T/C polymorphisms in NPC patients were not significantly different than that in healthy controls (P > 0.05). Our data suggest that IL‐12 gene may play a role in the development of NPC. © 2009 Wiley‐Liss, Inc.     

血浆 EB病毒游离 DNA检测对监测鼻咽癌患者预后的意义

背景与目的:有报道 , 测定血浆中的 EB病毒游离 DNA( EBV-DNA)的拷贝数可作为诊断及监测鼻咽癌患者病情变化的手段之一.本研究旨在评价血浆 EBV-DNA检测在鼻咽癌患者预后监测上的价值, 并进一步与 VCA/IgA、 EA/IgA进行比较.方法:比较鼻咽癌放疗后 30例远处转移患者、 22例局部复发患者、 24例无 瘤生存者血浆中 EBV-DNA、 VCA/IgA、 EA/IgA水平.分别应用荧光定量 PCR方法检测血浆 EBV-DNA水平,免疫酶法检测 VCA/IgA、 EA/IgA;前瞻性观察 20例初诊鼻咽癌患者放疗前、放疗剂量达 40 Gy时及放疗结束时上述指标的变化. 结果:放疗后各组不同预后患者的血浆 EBV-DNA含量的中位数有显著性差异, 远处转移组为 135 100 copies/ml(四分线区域 5 525～ 1 003 750 copies/ml) >局部复发组的 20 500(四分线区域 0～ 58 500 copies/ml) > 无瘤生存组的 0 copy/ml(四分线区域 0～ 0 copy/ml), P均 < 0.05. 远处转移组的血浆 EBV-DNA水平高者较多, 当阳性标准为 1 000 000 copies/ml时,诊断远处转移组的敏感性为 27.3%,而诊断局部复发组的敏感性为 0.0%,特异性均为 100.0%.在初诊患者放疗前、放疗剂量达 40 Gy时及放疗结束时, EBV-DNA水平逐渐降低,平均含量分别为 32 050 copies/ml(四分线区域 3 880～ 317 750 copies/ml)、 0 copy/ml(四分线区域 0～ 14 375 copies/ml)、 0 copy/ml(四分线区域 0～ 2 940 copies/ml), P均 < 0.05, 而 VCA/IgA、 EA/IgA的水平未见明显变化. 结论: 血浆 EBV-DNA检测可用于监测鼻咽癌患者预后,其价值明显优于 VCA/IgA、 EA/IgA.     

雌激素受体α基因单核苷酸多态性与中国陕西地区汉族人群子宫内膜癌的相关性研究

目的:探讨雌激素受体α（estrogen receptor α,ERα）基因exon 4 的A908G、C926T、G933A、C975G 4个单核苷酸多态性（single nucleotide polymorphisms,SNPs）与子宫内膜癌易感性的相关性。方法:基于人群的病例-对照研究,通过PCR产物直接测序法鉴定中国陕西地区汉族89例子宫内膜癌与115例良性病变组织的这4个SNPs的基因型,采用Logistic回归模型分析两组基因型与等位基因频率的分布,确定SNP位点基因型与子宫内膜癌临床病理特征的相关性。结果:所有组织的ERα基因3个位点SNPs 均呈A908A、C926C、G933G野生型;而exon 4 C975G 位点SNP呈三种基因型形式,其频率分布在两组均达到Hardy-Weinberg遗传平衡(P>0.05),说明具有群体代表性。两组975G等位基因的发生频率分别为48.9%和51.7%,均＞1%,说明均存在exon 4 位点C975G SNP。两组间基因型与等位基因频率均无显著性差异（P>0.05）,说明位点C975G SNP与子宫内膜癌的危险性无关。ERα基因C975G SNP基因型与临床病理特征无相关性（P>0.05）。结论:首先在中国人子宫内膜癌和对照组中发现ERα基因exon 4 突变975G等位基因,发生频率分别为48.9%和51.7%,均＞1%,但C975G SNP与子宫内膜癌的危险性无关;且提示ERα基因的多态性可能具有肿瘤类型和种族的特异性。首先在中国人子宫内膜癌和对照组中未发现ERα基因exon 4位点A908G、C926T、G933A 3个SNPs,表明这些位点多态性在子宫内膜癌病人中并不常见。     

The association of interleukin-16 gene polymorphisms with IL-16 serum levels and risk of nasopharyngeal carcinoma in a Chinese population

Interleukin (IL)-16 plays a fundamental role in inflammatory diseases, as well as in the development and progression of tumors. Genetic variation in DNA sequence of IL16 gene may lead to altered cytokine production and/or activity, and this variation may modulate an individual's susceptibility to nasopharyngeal carcinoma (NPC). To test this hypothesis, we investigated the association of IL16 gene polymorphisms and serum IL-16 levels with NPC risk in a Chinese population. We analyzed IL16 gene rs11556218 T/G, rs4778889 T/C, and rs4072111 C/T polymorphisms using PCR-RFLP and DNA sequencing, and serum IL-16 levels were measured by ELISA. The IL16 rs11556218 T/G polymorphism was significantly associated with the susceptibility to NPC patients. The TG genotype was associated with a significantly higher risk of NPC as compared with the TT genotype (OR?=?2.05, 95 % CI 1.04–4.01; p?=?0.037). Patients carrying the G allele had a significantly higher risk for developing NPC compared with individuals carrying the T allele (OR?=?1.79, 95 % CI 1.07–3.01; p?=?0.027). The serum IL-16 levels were increased in NPC patients compared with controls (p?<?0.01); the genotypes carrying the IL16 rs11556218 G variant allele were associated with increased serum IL-16 levels compared with the homozygous wild-type genotype in NPC patients (all p values <0.01). Our data suggested that IL16 rs11556218 T/G polymorphism was associated with increased susceptibility to NPC through increasing the production of serum IL-16 levels.     

HLA-B等位基因与新疆地区鼻咽癌相关性及其临床意义

目的 探讨HLA-B等位基因多态性与新疆地区鼻咽癌的关系及其临床意义。方法 纳入226例患者作为鼻咽癌组,207例健康志愿者作为健康对照组。采用PCR-SSP法对HLA-B等位基因进行检测。采用χ²检验两组之间、汉族和维吾尔族之间、鼻咽癌不同临床特征之间HLA-B等位基因频率差异。Kaplan-Meier法计算生存率并Logrank单因素分析与HLA-B等位基因频率关系。结果 鼻咽癌组HLA-B*46等位基因频率高于健康对照组(P=0.000),且HLA-B*46等位基因频率在汉族存在差异性(P=0.000),而维吾尔族未发现差异性(P>0.05)。<30岁组HLA-B*44等位基因频率高于≥30岁组(P=0.029);分化型非角化性癌和T₁+T₂期HLA-B*48等位基因频率分别高于未分化型非角化性癌和T₃+T₄期(P=0.029)。鼻咽癌5年OS、DFS、DMFS、LRFS率与HLA-B*46(P=0.118~0.502)、HLA-B*44(P=0.761~0.804)及HLA-B*48(P=0.308~0.727)表达状态无关。结论 HLA-B*46等位基因可能为新疆地区汉族鼻咽癌的易感基因,而HLA-B*44可能与较早发病年龄有关,HLA-B*48可能与病理类型及T分期有关。故HLA-B等位基因可能与鼻咽癌发生、发展有关。     

CYP1A1和CYP1B1基因多态性与中国妇女Ⅰ型子宫内膜癌的相关性

目的 探讨细胞色素P450 1A1（CYP1A1）和细胞色素P450 1B1（CYP1B1）基因多态性与Ⅰ型子宫内膜癌遗传易感性与流行病学高危因素的关系。方法 采用SNPshot技术,检测103例Ⅰ型子宫内膜癌患者和100例对照人群CYP1B1、CYP1A1和NQO1基因共8个位点的多态性分布,分析其与Ⅰ型子宫内膜癌易感性及肥胖、高血压等流行病学高危因素的相关性。结果 CYP1A1基因SNP位点rs4646421基因型在两组间分布频率差异有统计学意义（P<0.05）,与携带CT基因型者相比,携带CC基因型的个体罹患子宫内膜癌的风险较小（OR=0.479, 95%CI: 0.255~0.899）,携带T等位基因的个体子宫内膜癌的发病风险高于C等位基因携带者（OR=1.796, 95%CI: 1.203~2.680）。与携带CC基因型相比,携带TC+TT基因型在年龄>60岁、BMI≥25、绝经延迟（超过52岁）、并发高血压的女性中Ⅰ型子宫内膜癌的发病风险增加。CYP1B1基因SNPrs1056836在两组间的分布频率差异无统计学意义（P>0.05）,但发生更多的碱基胞嘧啶变异为鸟嘌呤,可能会使罹患Ⅰ型子宫内膜癌的风险增加（OR=0.604, 95%CI: 0.369~0.990）。结论 CYP1A1基因SNP位点rs4646421多态性增加了Ⅰ型子宫内膜癌的发病风险,并且与流行病学高危因素有关,有望成为Ⅰ型子宫内膜癌筛查的潜在指标。     

Potential Impact of Vascular Endothelial Growth Factor Gene Variation (-2578C>A) on Breast Cancer Susceptibility in Saudi Arabia: a Case-Control Study

Aim: VEGF gene polymorphisms can induce either increase or inhibition of VEGF secretion, with altered promoteractivity. The VEGF rs699947 SNP is located in the promoter region and is associated with susceptibility to breastcarcinoma development. Here, we investigated the association of the -2578C>A polymorphism in the VEGF gene withbreast cancer risk in Saudi women. Methodology: Genotyping of the VEGF-gene variation (-2578A>C) was performedusing the amplification refractory mutation system PCR. We investigated the association of VEGF gene variants withdifferent clinicopathological features of breast cancer patients. Results: A significant difference was observed ingenotype distribution among the breast cancer cases and sex matched healthy controls (p=0.03). The frequencies of thethree genotypes CC, CA, AA found in the patient samples were 37%, 45% and 18% and in the healthy controls were54%,37% ,and 09% respectively. An increased risk of developing breast cancer in Saudi women was associated withthe VEGF −2578 AA genotype (OR = 2.91, 95 % CI, 1.18-7.20; p = 0.01; RR 1.78 (1.01-3.11 p=0.01), the VEGF −2578A allele (OR = 1.79, 95 % CI, 1.17-2.73; p = 0.004: RR 1.35 1.07-1.71) and the VEGFR-(CA+ AA) (OR 1.99 1.13-3.51;RR 1.401.0-1.85). Thus the A allele increased the risk of BC when compared with C allele. When we stratified groupsof patients according to the status of tumor markers, stage, age and metastasis, statistically significant associationswith −2578 C/A SNP were revealed. Conclusion: Our data showed a significant association of the VEGF -2578C>Apolymorphism with BC susceptibility in Saudi women. The VEGF -2578AA homozygote significantly increases therisk and can be useful as a predisposing genetic marker. Further studies with larger sample sizes are necessary toconfirm our findings.     

红细胞补体受体1单核苷酸多态性与肝细胞癌发病风险的研究

目的 探讨红细胞补体受体1（CR1）单核苷酸多态性（SNP）与肝细胞癌（HCC）发病的关系。方法 收集102例HCC患者（HCC组）和98例健康体检者（对照组）的外周血样本,选取CR1的5个标签SNP位点（rs4844600 G＞A、rs17048010 T＞C、rs3818361 C＞T、rs11118167 T＞C和rs9429945 C＞T）进行检测,分析两组的红细胞CR1基因各SNP位点基因型、等位基因及单体型的分布差异及其与HCC患病风险的关系。同时按照性别、年龄相匹配的原则分别从对照组和HCC组中选取52例和53例样本采用流式细胞术检测其红细胞CR1的几何平均荧光强度比值（GMFIR）。结果 两组rs4844600 G＞A基因型和等位基因分布的差异有统计学意义（P＜0.01）。CR1基因rs4844600 G＞A／GG基因型携带者患HCC的风险为非携带者的2.458倍（95％ CI：1.357～4.451）,GA基因型携带者患病风险是非携带者的0.404倍（95％CI：0.218～0.746）,其等位基因G携带者患病风险为非携带者的1.945倍（95％CI：1.183～3.199）。rs17048010 T＞C、rs3818361 C＞T、rs11118167 T＞C、rs9429945 C＞T这4个SNP位点和rs11118167-rs3818361-rs17048010／TCT、TTC、CCT、TTT这4种单体型与HCC的患病风险无关（P＞0.05）。HCC组CR1的GMFIR水平为3.257±1.191,高于HCC组的2.652±0.789,差异有统计学意义（t=2.644,P=0.008）。结论 HCC患者红细胞免疫功能降低,CR1基因SNP位点rs4844600 G＞A与HCC发病关联。     

XRCC1 and hOGG1 genes and risk of nasopharyngeal carcinoma in North African countries

Although genetic susceptibility to nasopharyngeal carcinoma (NPC) has been recognized for a long time, little is known about the responsible genes. X-Ray repair cross-complementing protein 1 (XRCC1) and human 8-oxo-guanine glycosylase 1 (hOGG1) genes are involved in deoxyribonucleic acid (DNA) repair and were found associated with NPC risk in three Asian case-control studies. The objective of the present study was to test these genes in a sample from North Africa, one of the major NPC endemic regions in the world. Three single nucleotide polymorphisms (SNPs) in the XRCC1 gene and one SNP in the hOGG1 gene were genotyped in 598 NPC cases from Morocco, Algeria, and Tunisia and 545 controls frequency matched by recruitment center, age, sex, and urban/rural household. The genotype and allelic distributions for the hOGG1 (326)Ser/Cys SNP and for the XRCC1 (399)Arg/Trp, (280)Arg/His, and (194)Arg/Trp SNPs did not differ significantly among NPC cases and controls. The XRCC1 (194)Trp allele frequency was significantly lower in the North African population than in Asian population (f = 0.04 vs. 0.31 in Cantonese Chinese and 0.21 Han Chinese). The hOGG1 (326)Ser allele frequency was significantly higher in the North African population (f = 0.73) than in Asian populations (f = 0.39 in Taiwanese). The results of the present study obtained from a large sample indicate that the XRCC1 and hOGG1 genes are unlikely to play a role in the susceptibility to NPC in North Africans. Our results do not corroborate those found in Asian population on smaller samples.     

MDM2 SNP309 T>G alone or in combination with the TP53 R72P polymorphism does not appear to influence disease expression and age of diagnosis of colorectal cancer in HNPCC patients

Disease expression in hereditary nonpolyposis colorectal cancer (HNPCC) cannot be readily explained by mutation site in the respective DNA mismatch repair genes associated with this disorder. One explanation is the role of modifying genes that can either promote or prevent disease development on a background of increased risk. Two single nucleotide polymorphisms in MDM2 and TP53 have been shown to be associated with younger ages of disease onset in HNPCC (TP53) and Li-Fraumeni syndrome (MDM2). In this study 220 HNPCC patients were examined, from Australia and Poland, all characterized at the molecular level to determine the frequency of the MDM2 SNP309 T>G and to assess its influence on disease expression. The results were then pooled with the results of a previous study to assess the combined influence of the MDM2 SNP309 T>G and TP53 SNP R72P. A significant difference was observed between CRC patients and unaffected MMR gene mutation carriers over the age of 45 years (p = 0.01). The unaffected MMR gene mutation carriers over the age of 45 years who carry the G allele have a reduced risk of developing CRC. The results indicate that the MDM2 SNP309, alone or in combination with TP53 R72P, does not influence age of diagnosis of CRC in individuals with HNPCC. In conclusion, the data indicates the G allele of MDM2 SNP309 might have a protective effect on disease development in HNPCC patients and that age of diagnosis of CRC is not associated with MDM2 SNP309 or TP53 R72P either as single SNPs or combined.     

VEGF基因-460T/C单核苷酸多态性与河北地区汉族人群肺癌发病风险相关性分析

目的:研究血管内皮生长因子(VEGF)基因启动子区-460T/C单核苷酸多态性(SNP)与河北地区汉族人群肺癌发病风险的关系。方法:采用基于医院的病例-对照研究方法,采集200例肺癌患者和204名健康对照的静脉血,同时记录其病史和个人相关资料。以蛋白酶K消化-饱和氯化钠盐析法提取外周血白细胞DNA,采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法和引物介导的限制性聚合酶链反应(PIRA-PCR)方法检测VEGF-460T/C多态性位点的基因型。结果:肺癌组VEGF-460C/T SNP C等位基因频率(27.5%)明显高于对照组(20.1%),两组比较差异有统计学意义,χ2=6.109,P=0.013。肺癌组与对照组的T/T、T/C+C/C基因型频率分别为52.2%、47.5%和63.2%、36.7%,差异有统计学意义,χ2=4.445,P=0.029。与T/T基因型相比,携带C等位基因(T/C+C/C)的基因型可显著增加肺癌的发病风险;与T/T基因型相比,携带C等位基因(T/C+C/C)的基因型可显著增加不吸烟人群的发病风险。与T/T基因型相比,携带C等位基因的基因型(T/C+C/C),明显增加肺鳞状细胞癌及小细胞癌发病风险。结论:VEGF-460T/C SNP可能与肺癌发病风险相关。     

锰超氧化物歧化酶基因的多态性与食管癌发生和发展的关系

目的 探讨锰超氧化物歧化酶(MnSOD)基因单核苷酸多态性与食管癌的发生及病变进展的关系.方法 采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法,分析103例食管癌患者(食管癌组)和195例正常对照人群(对照组)的MnSOD基因启动子区上游第9位点单核苷酸多态性,比较不同基因型与食管癌发病风险以及病变部位、病变长度、最大直径和临床分期之间的关系.结果 在食管癌组中,MnSOD基因启动子区上游第9位点变异基因型(TC+CC)分布的频率为28.2%,明显高于对照组(17.4%;X~2=4.645,P＜0.05);与携带TT基因型者相比,携带C等位基因(TC+CC)的个体患食管癌的风险增加了1.889倍(95%CI为1.052～3.391).食管癌组中,病变长度≤5 cm者,变异基因型分布的频率为16.3%;病变长度＞5 cm者,变异基因型分布的频率为36.7%,差异有统计学意义(X~2=5.147,P＜0.05).MnSOD 9 T→C变异与食管癌的病变长度呈正相关,但与食管癌的病变部位、最大直径以及临床分期之间无明显的相关性.结论 MnSOD 9 T→C变异增加了食管癌的发病风险,其可以作为食管癌遗传易感性的标志物,用于易感个体的预警,并且该基因的多态性可能与食管癌病变的纵向进展相关.     

TLR3和TLR4基因多态性与EBV相关胃癌易感性的关系

目的 探讨TLR3c.1377和TLR4Asp299Gly基因多态性与EBV感染在EBV相关胃癌（EBVassociated gastric carcinoma, EBVaGC）发生中的相关性。方法 选用41例EBVaGC组织、62例EBV阴性胃癌（EBV-negative gastric carcinoma, EBVnGC）组织以及64例健康人群血标本作为研究对象,采用PCR结合限制性长度多态性分析（reaction-restriction fragment length polymorphism, RFLP)技术检测TLR3c.1377 和TLR4 Asp299Gly基因多态性,并对实验结果进行统计分析。结果 （1）胃癌组与对照组比较TLR3c.1377基因型频率差异有统计学意义（P=0.025）,胃癌组T等位基因频率明显高于对照组（45.6% vs. 29.7%,P=0.004),T等位基因携带者的患病风险明显高于非携带者(OR=2.435,P=0.008）;（2）EBVaGC、EBVnGC以及对照组间TLR3c.1377基因型、等位基因频率差异无统计学意义（P>0.05）。（3）EBVaGC组,EBVnGC组以及正常对照组所有个体TLR4 Asp299Gly基因型均为Asp/Asp纯合子（P>0.05）。结论 TLR3c.1377基因多态性与胃癌易感性有关,T等位基因为胃癌的危险因子,而C等位基因为一保护基因;TLR3c.1377基因多态性与EBVaGC易感性无明显相关。     

ZO-1 SNPs与胃癌遗传易感性及预后*

目的:探讨中国福建地区汉族人群中ZO- 1 基因TJP1 4 个已知位点单核苷酸多态性（SNPs）与胃癌遗传易感性及进展和预后的相关性。方法:应用PCR-LDR法检测福建医科大学附属第一医院200 例健康体检个体及220 例原发性胃腺癌患者TJP1基因4 个SNP 位点的基因型。结果:福建地区汉族人群中,TJP-1 SNP rs 7179270 位点稀有等位基因C 的频率为0.2,而其他三个位点（rs 34771010,rs 28578444和rs 41280058）稀有等位基因频率为0.0。TJP1 基因SNP 位点rs 7179270 200 例对照组等位基因C、T 的频率分别为20% 和80% ,胃癌病例组等位基因C、T 的频率为32.6% 和67.4% ;CC、C/T和TT的基因型频率在对照组分别为4% 、32%和64% ,而在病例组为10.9% 、43.2% 和45.9% ,差异具有统计学意义（OR= 1.953,95%CI 1.425～2.677,P<0.001）。 TJP1 rs 7179270位点基因型与胃癌患者的性别、年龄、分化程度、浸润深度、淋巴结转移及手术后生存时间无显著相关（P>0.05）。 结论:TJP1rs 7179270 位点携带等位基因C 的CC和C/T基因型个体的胃癌患病风险提高,提示检测该位点基因型有助于评估胃癌的遗传易感性;TJP1 rs 7179270 位点的基因型频率与临床病理学参数及胃癌患者手术后生存时间无显著相关性,提示TJP1 rs 7179270 位点多态性可能不参与胃癌的进展和预后;TJP1 rs 34771010、rs 28578444和rs 41280058稀有等位基因频率为0.0,推测中国福建地区人群可能无这三个位点的多态性分布。      

PTEN基因第5,8外显子多态性与子宫内膜癌的相关性研究

目的:探讨PTEN基因第5,8外显子多态性与子宫内膜癌易感性的相关性。方法:用PCR-RFLP方法及Southern杂交技术检测PTEN基因第5,8外显子在内膜癌组及正常对照中的基因型与基因频率并进行统计学比较。结果:外显子5、8的病例组与对照组间各基因型及基因频率分布比较差异均有显著性(P<0.005)。结论:PTEN基因第5、8外显子多态性与内膜癌易感性有一定相关性。     

The association between circulating tumor cells and Epstein-Barr virus activation in patients with nasopharyngeal carcinoma

Background: Circulating tumor cells (CTCs) and microemboli (CTM) are attracting increasing attention in medical biology and clinical practice. However, the clinical relevance of CTCs in nasopharyngeal carcinoma (NPC) has not yet been ascertained, and no study has focused on the influence of Epstein-Barr virus (EBV) status on CTCs in NPC patients. These issues were therefore examined. Methods: Peripheral blood samples were prospectively obtained from 33 NPC patients before treatment. CTCs and CTM were captured using the Isolation by Size of Epithelial Tumor (ISET) method. Immunohistochemistry on CK5/6 (cytokeratin5/6) and P63, as well as in situ hybridization of EBERs (EBV-encoded RNAs) were used to validate the harvested tumor cells. Results: Out of 33 NPC patients, CTCs were detected in 22 cases (66.7%), and CTM were observed in 2 cases (6.1%). CTCs were presented in all stages of NPC patients but had no association with the TNM stages (all P > 0.05). The presence of CTCs appeared to correlate with EBV activation status. Among the total NPC patients, the EBV VCA-IgA levels in CTC-positive cases were higher than that in CTC-negative cases (negative vs. positive: 3.88 vs. 4.86, P = 0.016). A similar result was observed in the patients without distant metastasis (negative vs. positive: 3.76 vs. 4.95, P = 0.009). When the number of CTCs was considered, CTC counts were found to correlate with EBV VCA-IgA (R = 0.382, P = 0.041) and EBV DNA load (R = 0.396, P = 0.033) for all NPC patients as well as NPC patients without distant metastases. Conclusions: These findings strongly suggested detectable CTCs/CTM in all stages of NPC patients and support a positive correlation between CTCs and EBV activation in NPC patients.