洛阳市GSTM1和GSTT1缺失基因型与肝癌的遗传易感性

目的探讨肝癌低发区谷胱甘肽转硫酶(GST)M1和T1的缺失基因型与肝癌的关系.方法应用多重PCR技术检测洛阳市95例肝癌患者和103例对照的GSTM1和GSTT1基因型.结果病例组GSTM1缺失基因型的频率为0.705,对照组为0.502,两者差异有显著性(x2=8.28,P=0.004),OR值为2.35(95%CI:1.25～4.41);病例组GSTT1缺失基因型的频率为0.611,对照组为0.437,两者差异有显著性(x2=5.97,P=0.015),OR值为2.02(95%CI:1.10～3.71).叉生分析表明该两因素在肝癌发生中有协同作用(x2=14.83,P=0.002),同时具有两个缺失基因型时,OR值为5.57(95%CI:2.03～15.66);GSTM1和GSTT1缺失基因型均与吸烟有协同作用,OR值分别为5.84(95%CI:2.26～15.47)和5.51(95%CI:2.13～14.54);GSTM1缺失基因型与饮酒有协同作用,OR值为3.31(95%CI:1.47～7.49),而GSTT1缺失基因型与饮酒无协同作用.结论在肝癌低发区GSTM1和GSTT1缺失基因型是肝癌的易感基因型.     

GSTM1基因多态性和膀胱癌遗传易感性关系

目的：探讨谷胱甘肽转移酶（GSTMl）基因多态性与膀胱癌遗传易感性的关系。方法：采用面访填写调查表，以PCR技术、病例一对照研究方法，对252例病理证实原发膀胱移行细胞癌患者和320例健康对照者的GSTM1基因型进行检测。结果：膀胱癌患者GSTM1缺失基因型频率为45．2％。对照组为30．9％，两组比较差别有显著性意义（P〈0．05），OR值为1．89（95％CI=1．28～4．40）。吸烟者中，患者组GSTM1缺失基因型频率为66．2％，对照组为27．3％，差别显著（P〈0．01），OR值为8．9（95％CI=5．36～14．82）。同时憋屎及有家族肿瘤史也能增加患膀胱癌的危险性，但多饮牛奶则能降低膀胱癌的危险性，而水果摄入多少与膀胱癌发生危险性无统计学意义。结论：GSTM1基因多态性与膀胱癌易感性有关，该基因多态性与吸烟在膀胱癌的发生发展中起协同作用。     

广西壮族人群GSTM1和GSTT1基因多态性与肺癌易感性关系的研究

[目的]探讨广西壮族人群谷胱甘肽硫转移酶（glutathione S-transferase,GST）中的GSTM1和GSTT1基因多态性与肺癌易感性的关系。[方法]以病例对照研究方法,采用聚合酶链式反应（PCR）分别检侧58例肺癌患者和60例健康对照的GSTM1、GSTT1基因多态性;χ2检验分析各种基因型频率在肺癌组和对照组之间的差异;用Logistic回归分析吸烟与GSTM1、GSTT1基因型多态性的联合作用。[结果]单独分析GSTM1、GSTT1基因多态性与肺癌相关性无统计学意义,而两者联合则与肺癌有相关性（χ2=4.085,P=0.043）。吸烟与GSTM1缺陷型基因对肺癌易感有协同作用,OR为3.778（95%CI：1.170～12.194,P=0.026）;吸烟与GSTT1缺陷型基因对肺癌易感无协同作用,OR为2.833（95%CI：0.982～8.173）。[结论]GSTM1、GSTT1的单一基因多态性不增加患肺癌的危险,而两者联合作用时可增加患肺癌的风险。GSTM1缺陷型有吸烟行为的人更易患肺癌。     

口腔颌面部恶性肿瘤GSTT1、GSTM1基因多态性改变初步研究

目的探讨谷胱甘态转硫酶M1（GSIM1）和T1（GSTT1）基因型与口腔颌面部恶性肿瘤发生的相关性。方法采用多重PCR技术，对87例口腔颌面部恶性肿瘤病例和与之匹配的对照组87例GSTM1、GsTT1基因型进行检测。结果口腔颌面部恶性肿瘤患者与对照组GSTM1基因缺失频率分别为62．1％和44．8％，差异有显著性（χ^2=5．197，P=0．023），GSTM1基因缺失与口腔颌面部恶性肿瘤易感性有关（OR=2．014，95％CI=1．100～3．688）。GSTM1基因缺失同时暴露于吸烟者患颌面部恶性肿瘤的危险性显著增加（OR=5．477，95％CI=2．257～14．619）。结论GSTM1基因缺失型可能是口腔颌面部恶性肿瘤的易感基因型，GSTM1基因缺失与吸烟在口腔颌面部恶性肿瘤的发生、发展中可能具有协同作用。     

GSTM1、GSTT1基因多态性与家族聚集性肝癌的遗传易感性研究

目的探讨GSTM1、GSTT1基因多态性与家族聚集性肝癌遗传易感性的关系。方法应用PCR技术检测GSTM1、GSTF1在家族聚集性肝癌和肝癌高发家系的基因表型。结果家族聚集性肝癌组GSTM1（-）、GSTT1（-）基因型频率分别为68．8％、47．5％,显著高于非家族聚集性肝癌组（54．6％、30．8％）和对照肝组织组（53．3％、25．3％）（P〈0．05）;随着家族中患肝癌病例数的增加,GSTM1（-）、GSTT1（-）基因型的频率逐渐升高,肝癌高发家系组GSTM1（-）、GSTT1（-）基因型频率分别为68．1％和44．9％,显著高于对照家系组（47．5％、25．0％）（P〈0．05）。若将GSTM1（-）T1（-）基因型视为危险暴露因素．．家族聚集性肝癌组GSTM1（＋）T1（＋）和GSTM1（＋）T1（-）／GSTM1（-）T1（＋）基因型频率均显著低于非家族聚集性肝癌组和对照肝组织组（P〈0．01）。结论GSTMI、GSTF1遗传多态性与家族聚集性肝癌的遗传易感性有关,GSTM1（-）、GSTT1（-）基因型可能是肝癌家族成员的危险暴露因素。     

广西扶绥人群GSTM1和GSTT1基因多态性与肝癌易感性关系的研究

目的:探讨GSTM1和GSTT1基因多态性与肝癌易感性关系,以及基因与基因间的相互作用.方法: 应用病例-对照分析研究,采用多重PCR技术,对广西扶绥100例肝细胞癌患者、60例正常人群的GSTM1和GSTT1基因型进行检测.将实验结果与临床资料结合进行统计学分析.结果: GSTM1基因空白型在HCC组和正常对照组中的频率分别为59.0%、68.3%(P>0.05);HCC组GSTT1基因缺失频率(33.0%)显著高于正常对照组(18.3%);GSTM1和GSTT1基因同时缺失在肝癌组和对照组中的频率分别为22.0%和3.3%,两者差异有统计学意义.结论:1)GSTM1和GSTT1基因的缺失是通过遗传获得.2)GSTT1基因缺失是HCC的易感因素.3)GSTM1和GSTT1基因联合缺失与HCC的发生呈显著正相关,且两基因具有协同作用,可作为HCC高危人群筛选的有用指标.     

谷胱甘肽转移酶M1基因多态与胃癌易感性关系的Meta分析

[目的]探讨谷胱甘肽转移酶M1(GSTM1)基因多态性与胃癌易感性关系。[方法]检索并筛检1996￣2007年间GSTM1基因多态性与胃癌易感性关系相关的文献,利用RevMan4.28和SAS9.1.3软件包对各研究结果进行异质性分析,选择适当的分析模型进行定量合并估计其效应,同时进行稳定性的分析和发表偏倚的估计。[结果]共纳入28篇文献3776例胃癌病例和7772例对照;Meta分析结果显示,携带GSTM1空白基因型者胃癌的发病风险是非携带者的1.26倍(95%CI:1.11￣1.43),按不同人群分层分析显示亚洲人群特别是中国人群GSTM1基因多态性与胃癌的发病风险显著相关(亚洲:OR=1.39,95%CI:1.20￣1.60;中国:OR=1.58,95%CI:1.35￣1.85),而在高加索人群中则无明显关联(OR=1.01,95%CI:0.83￣1.22)。敏感性分析显示该结果较为稳定,但存在显著性发表偏倚。[结论]GSTM1空白基因型是亚洲人群,特别是中国人群胃癌发病的危险因素。     

GSTA 4基因调控区T/A多态与肺癌易感性之间的关联分析

目的：研究中国汉族人群谷胱甘肽S转移酶A4基因调控区-1718位T／A多态（rs182623）与肺癌遗传易感性之间的关系。方法：采用病例-对照研究方法，应用Bead Lab Genotyping System技术对312例经病理学确诊的肺癌患者和307例正常人的GSTA4基因调控区-1718位多态进行检测。结果：GSTA4调控区-1718位点突变的A等位基因频率在病例组为12．5％、正常对照组为19．1％，组间的差异有统计学意义（x^2=10．08，P=0．002）。与携带GSTA4基因调控区-1718位TT基因型相比较，至少携带一个突变A等位基因（TA和AA）的个体患肺癌风险降低了50％（校正OR=0．50，95％CI=0．346～0．725），病理分型分析结果显示风险降低主要发生在肺鳞癌和小细胞肺癌[OR、95％CI分别为0．41（0．231～0．732）、0．36（0．135～0．976）]。分层分析后显示，此保护作用在累计吸烟量≤25包年人群中更强（P〈0．001，校正0R值-0．24，95％CI=0．110～0．533）。结论：首次发现GSTA4基因调控区-1718位T／A多态可能与中国汉族人群肺癌遗传易感性有关联。     

GSTM1、GSTT1基因多态性和饮酒习惯与原发性肝癌发生的危险性

目的　研究GSTM 1和GSTT 1基因的多态性和饮酒习惯与原发性肝癌发生的危险性。方法　在肝癌高发区江苏省泰兴市进行了以人群为基础的病例对照研究 ,并应用多重PCR法检测了 2 0 7例原发性肝癌及其 1∶1配对的正常对照的GSTM 1和GSTT 1基因型。结果　GSTM 1空白基因型的频率 ,病例组为 5 8.94% ,对照组为 5 7.0 0 % ;GSTT 1空白基因型的频率 ,病例组和对照组分别为 5 2 .17%和 46.86% ,2组间无显著性差异。但GSTT 1的空白基因型与非空白基因型相比 ,当其长期饮用高度白酒达2 3年以上或月饮酒量大于 3 0 0 0 g时 ,患肝癌的危险性显著增高 (OR =2 .5 6,95 %CI为 1.0 8～ 6.0 5或OR =3 .48,95 %CI为 3 1.47～ 8.2 2 ) ;此外分析饮酒总量 (kg·年 )也得到同样的结果 (OR =3 .71,95 %为 1.5 1～ 9.12 )。结论　携带GSTT 1空白基因型且有长期大量饮酒习惯者 ,其患肝癌的危险性显著增高     

XRCC1基因多态性与山东省籍人群胃癌易感性关系的研究

目的:研究XRCC1基因多态性与山东省人群胃癌易感性的关系.方法:采用1:1病例-对照研究方法,收集山东籍原发性胃癌病例107例,同时随机选取同性别、同民族、年龄相差±5岁、同期住院的非肿瘤、非消化道系统疾病患者作为对照,采用PCR-RFLP方法分析XRCC1基因Arg194Trp、Arg280-His和Arg399Gln 3个位点的多态性,比较不同基因型与胃癌易感性的关系.结果:在病例组和对照组194Trp的频率为53.27%和43.93%,280His的频率为12.15%和15.89%,399Gln的频率为54.21%和46.73%,差异均无统计学意义.在≥60岁年龄组携带194Trp等位基因的个体其胃癌风险增高(OR=2.303,95%CI=1.061～4.996,P=0.033),携带194Trp等位基因者可增加罹患胃底贲门癌的危险性(OR=2.766,95%CI=1.106～7.825,P=0.049)和发生远处转移的风险(OR=2.188,95%CI=1.022～4.688,P=0.042).结论:XRCC1 Arg194Trp基因多态性可增加老年人患胃癌的风险,与胃底贲门癌的发生有关,并促进胃癌的远处转移.Arg280His和Arg399Gln基因多态性与胃癌易感性无关联.     

GST (GSTM1, GSTT1, and GSTP1) polymorphisms in the genetic susceptibility of Turkish patients to cervical cancer

Objective

This work investigates the role of glutathione S-transferase M1 (GSTM1), glutathione S-transferase T1 (GSTT1), and glutathione S-transferase P1 (GSTP1) enzymes and polymorphisms, which are found in phase II detoxification reactions in the development of cervical cancer.

Methods

This study was conducted with 46 patients diagnosed with cervical cancer and 52 people with no cancer history. Multiplex PCR methods were used to evaluate the GSTM1 and GSTT1 gene polymorphism. However, the GSTP1 (Ile105Val) gene polymorphism was studied using a PCR-RFLP method. The patient and control groups were compared using a chi-square test with p<0.05.

Results

In the patient group, statistical significance was determined for gravidity (p=0.03), parity (p=0.01), and the number of living children (p=0.01) compared to the control group. The gene frequency of GSTM1, GSTT1, and GSTP1 polymorphisms was evaluated. We observed that GSTM1 and GSTT1 null genotype frequencies were 54.3% and 32.6% respectively, while GSTP1 (Ile/Val), (Ile/Ile), (Val/Val) genotype frequencies were 52%, 44%, and 4%, respectively, in the cervical cancer patients. No statistical variation was determined between the control and patient groups in terms of GSTM1, GSTT1, and GSTP1 polymorphisms (p>0.05).

Conclusion

Our results demonstrate that GSTT1, GSTM1, and GSTP1 polymorphisms are not associated with cervical cancer in Turkish patients.     

Proton pump inhibitors and stomach neoplasm

This study aimed to explore the relationship between proton pump inhibitors(PPIs)and gastric tumors and determine the reasons behind these connections.We reviewed studies on PPIs and stomach tumors.We explored the relationship between PPIs and different types of gastric neoplasms according to the classification of gastric neoplasms.Long-term use of PPIs is associated with stomach infection,high gastrin levels,and rebound acid hypersecretion,which are directly or indirectly related to the development of gastric neoplasms.PPIs can increase the risk of gastric fundal polyps.Further evidence is needed to prove that it can increase the risk of gastric cancer.     

GSTM1 and GSTT1 polymorphisms and postmenopausal breast cancer risk

Glutathione S-transferases (GSTs) are a family of important enzymes involved in the detoxification of a wide variety of known and suspected carcinogens, including potential mammary carcinogens identified in charred meats and tobacco smoke. A substantial proportion of the Caucasian population has a homozygous deletion (null) of the GSTM1 or GSTT1 gene, which results in lack of production of these isoenzymes. We conducted a case-control study in a cohort of postmenopausal Iowa women who in 1986 completed a mailed questionnaire on lifestyle factors including information on cigarette smoking and breast cancer risk factors. DNA samples and information related to charred meat intake were obtained, in the case-control study, from breast cancer cases diagnosed during 1992–1994, and a random sample of cancer-free cohort members. Included in this study were 202 cases and 481 controls who were genotyped for GSTM1 or GSTT1 gene polymorphisms. Compared to women who had both GSTM1 and GSTT1 genes, a 60% elevated risk (95% CI = 1.0–2.5) was observed among those whose GSTM1 or GSTT1 gene was deleted. When stratified by meat eating habits, the risk of breast cancer associated with null GSTM1 or GSTT1 genotype was observed primarily among women who ate meats consistently well- or very well-done. Women who carried either one of the null genotypes and consumed meat consistently well- or very well-done had a 3.4-fold elevated risk of developing breast cancer (95% CI = 1.6–7.1). Cigarette smoking was not a risk factor for breast cancer among women who had either the GSTM1 or GSTT1 genes. Among those with the null GSTT1 genotype, however, a significantly elevated risk of breast cancer was associated with cigarette smoking (OR = 2.5, 95% CI = 1.1–5.4) and the association was stronger among former (OR = 4.4, 95% CI = 1.5–12.8) than current smokers (OR = 1.3, 95% CI = 0.4–4.1). This study suggests that certain null GST genotypes may be associated with an elevated risk of breast cancer and the association may be modified by charred meat intake and cigarette smoking.     

GSTM1、GSTT1基因多态性对宫颈癌患者新辅助化疗疗效及预后的影响

目的:研究谷胱苷肽硫转移酶M1（GSTM1）、谷胱苷肽硫转移酶T1（GSTT1）基因多态性对新辅助化疗（NACT）宫颈癌患者疗效的影响及与患者预后的关系。方法:选取2011年5月至2013年5月本院诊治的宫颈癌患者78例为研究对象,NACT采用铂类和紫杉醇类药物,GSTM1、GSTT1基因多态性检测采用多重PCR技术。结果:GSTM1和GSTT1基因在宫颈癌患者中呈多态性分布,GSTM1、GSTT1非缺失组患者总有效率显著高于GSTM1、GSTT1缺失组（P＜0.05）。GSTM1、GSTT1缺失组患者5年生存率显著低于GSTM1、GSTT1非缺失组患者（P＜0.05）。GSTM1、GSTT1基因缺失是影响NACT宫颈癌患者不良预后发生的独立危险因素（P＜0.05）。结论:不同GSTM1、GSTT1基因分型下,NACT对宫颈癌患者的疗效有显著差异,GSTM1、GSTT1基因缺失是影响NACT宫颈癌患者不良预后发生的独立危险因素。     

GSTT1 and GSTM1 polymorphisms and myelodysplastic syndrome risk: a systematic review and meta‐analysis

Glutathione‐S‐transferace polymorphisms may make hematopoietic lineage cells susceptible to genotoxicity following exposure to heavy metals or benzene. We conducted a systematic review and meta‐analysis to define the effect of GSTM1 and GSTT1 null polymorphisms on MDS risk. We searched the PubMed and SCOPUS databases to identify peer‐reviewed published case‐control studies investigating the association between GSTT1 and/or GSTM1 null genotypes and development of MDS. Between‐study heterogeneity was assessed using Cochran's Q statistic and the I² statistic. Odds ratios from individual studies were pooled using fixed and random effects models. Thirteen studies were considered eligible for the GSTT1 meta‐analysis (1471 cases, 1907 controls) and 10 were considered eligible for the GSTM1 meta‐analysis (1161 cases, 1668 controls). For the GSTT1 polymorphism, there was moderate between study heterogeneity (p_Q = 0.01; I² = 52.3%) and the null genotype was significantly associated with increased risk of MDS development, random effects OR = 1.43 (95% CI, 1.09–1.89); p = 0.01. For the GSTM1 polymorphisms there was moderate between‐study heterogeneity (p = 0.07; I² = 43.1%) and the random effects OR = 1.02 (95% CI, 0.82–1.28) was non‐significant (p = 0.85). The GSTT1 null genotype is a significant risk factor for MDS development. Gene‐environment interactions need to be further explored.     

Associations of GSTM1 and GSTT1 polymorphisms with pancreatic cancer risk

Glutathione S-transferases (GSTs), including glutathione S-transferase M1 (GSTM1) and glutathione S-transferase T1 (GSTT1), are multifunctional enzymes which play vital roles in the detoxification of a variety of carcinogens. The genetic polymorphisms of GSTM1 and GSTT1 have been implicated in pancreatic cancer risk, but the results of published studies remain conflicting. Thus, a meta-analysis was conducted to estimate the effect of GSTM1 and GSTT1 polymorphisms on the risk of developing pancreatic cancer. A comprehensive search was performed in the PubMed, Embase, Web of Science, and Wanfang databases to identify the available studies on the associations of GSTM1 and GSTT1 polymorphisms with pancreatic cancer risk. The pooled odds ratio (OR) with its corresponding 95 % confidence interval (95 % CI) was used to estimate the associations. Stratified analyses by ethnicity and sensitivity analyses were performed to further identify the relationships. Overall, the null genotype of GSTT1 was associated with an increased risk of pancreatic cancer (OR?=?1.61, 95 % CI 1.06–2.44, P _OR?=?0.025), but similar association was not found between the null genotype of GSTM1 and pancreatic cancer risk. Besides, a significant association of GSTT1 polymorphism with pancreatic cancer risk was identified in Asians (OR?=?2.58, 95 % CI 1.67–3.98, P _OR?<?0.001), but not in Caucasians (OR?=?1.16, 95 % CI 0.94–1.43, P _OR?=?0.170). Sensitivity analyses by sequential omission of individual study confirmed the stability of our results. Meta-analysis of available data thus far shows that the null genotype of GSTT1 is a risk factor for pancreatic cancer, particularly in the Asian population. The currently available data are not sufficient enough to identify the association between the GSTM1 polymorphism and pancreatic cancer risk.     

Modification effects of GSTM1, GSTT1 and CYP2E1 polymorphisms on associations between raw salted food and incomplete intestinal metaplasia in a high-risk area of stomach cancer

Incomplete intestinal metaplasia (IM) is a precursor of stomach cancer. To identify risk factors of incomplete IM, a 2-stage survey was carried out in 1995 among 1,485 residents in Matzu, an area with highest mortality from stomach cancer in Taiwan. There were 312 study subjects including 174 men and 138 women sampled for the gastroendoscopic examination of IM. Information on personal and familial history of stomach cancer, cigarette smoking, alcohol consumption and intake frequency of various salted food items were obtained by personal interview based on a structured questionnaire. Blood samples were collected from each participant. Four biopsies per subject were taken from all subjects at gastroendoscopic examination to diagnose the status of IM pathologically. The Helicobacter pylori in biopsies was detected by the histomorphological or immunochemistry method, and antibodies against H. pylori in serum by the enzyme-linked immunosorbent assay. Plasma level of selenium was determined by atomic absorption spectrometry, plasma level of retinol, alpha-tocopherol, alpha-carotene, and beta-carotene by high performance liquid chromatography, genotypes of glutathione S-transferase (GST) M1 and T1 and cytochrome P450 (CYP) 2E1 by polymerase chain reaction. The significant association between history of stomach cancer among first-degree relatives and incomplete IM was found (odds ratio [OR] = 2.50; 95% confidence interval [CI] = 1.15-5.43). There was no association between H. pylori infection and incomplete IM. Alcohol drinkers for >20 years had an elevated risk compared to non-drinkers (OR = 3.34; 95% CI = 1.19-9.39). No associations between incomplete IM and plasma levels of selenium, retinol, alpha-tocopherol, alpha-carotene and beta-carotene were found. Salted food including salted meat, dehydrated salted vegetables and raw salted seafood consumed at ages of 相似文献