-765G > C COX-2 polymorphism may be a susceptibility marker for gastric adenocarcinoma in patients with atrophy or intestinal metaplasia

AIM： To investigate the relationship between the -765G 〉 C COX-2 polymorphism and the development of different gastric lesions： atrophy or intestinal metaplasia and gastric adenocarcinoma. METHODS： A cross-sectional study was performed involving 320 Portuguese individuals （210 without evidence of neoplastic disease, 73 patients with gastric adenocarcinomas and 37 with atrophy or intestinal metaplasia） using a PCR-RFLP method.RESULTS： -765C allele was overrepresented in the patients with gastric adenocarcinoma （51%） when compared either with the control group （38%） or patients with atrophy or intestinal metaplasia （27%）. Callele was found to be very common in our population （0.22）, and a multivariate logistic regression analysis revealed nearly 3-fold increased risk for the progression to gastric adenocarcinoma in patients with atrophy or intestinal metaplasia carrying the -765C allele （OR = 2.67, 95% CI = 1.03-6.93; P = 0.04）.CONCLUSION： -765C carrier status should be considered as another susceptibility marker for gastric adenocarcinoma development in patients with atrophy or intestinal metaplasia.

Interleukin-10 -1082 promoter polymorphism is not associated with susceptibility to esophageal squamous cell carcinoma and gastric cardiac adenocarcinoma in a population of high-incidence region of north China

AIM: To investigate the possible association of G→A single nucleotide polymorphism (SNP) at the -1082 position of interleukin (IL)-10 promoter with susceptibility to esophageal squamous cell carcinoma (ESCC) and gastric cardiac adenocarcinoma (GCA) in a population of a high incidence region of North China.METHODS: IL-10-G1082A promoter SNP was genotyped by polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP) in 355 cancer patients (203ESCC and 152 GCA) and 443 healthy controls.RESULTS: Smoking significantly increased the risk of ESCC and GCA development (the age and sex adjusted OR = 1.42and 2.64, 95%CI = 1.11-1.81 and 1.46-4.76, respectively).Similarly, family history of upper gastrointestinal cancer (UGIC) significantly increased the risk of developing ESCC and GCA (the age and sex adjusted OR = 1.44 and 3.10,95%CI = 1.18-1.75 and 1.94-4.97, respectively). The A/A, A/G and G/G genotype frequencies of IL-10-G1082A were 60.3%, 37.0% and 2.7% in healthy controls, 57.6%,39.9% and 2.5% in ESCC and 61.2%, 36.8% and 2.0% in GCA patients, respectively. The frequencies of A and G alleles were 78.8% and 21.2% in healthy controls, 77.6%and 22.4% in ESCC patients and 79.6%, 20.4% in GCA patients. The distribution of genotype and allelotype in ESCC and GCA patients was not significantly different from that in healthy controls (P＞0.05). Compared to the A/A genotype, the combination of A/G and G/G genotypes did not show a significant effect on the risk of developing ESCC and GCA; the adjusted odds ratio was 0.92 (95%CI = 0.76-1.11) in ESCC and 0.95 (95% CI = 0.61-1.46)in GCA, respectively. When stratified for smoking status and family history of UGIC, the combination of A/G and G/G genotypes also did not show any significant influence on the risk of ESCC and GCA development compared to A/A genotypes.CONCLUSION: IL-10-G1082A polymorphism might not be used as a stratification marker to predicate the risk of ESCC and GCA development in North China.

Polymorphism of -765G > C COX-2 is a risk factor for gastric adenocarcinoma and peptic ulcer disease in addition to H pylori infection:A study from northern India

AIM: To investigate -765G > C COX-2 polymorphism and H pylori infection in patients with gastric adenocarcinoma, peptic ulcer disease (PUD) and non- ulcer dyspepsia (NUD). METHODS: We enrolled 348 adult patients (62 gastric adenocarcinoma, 45 PUD and 241 NUD) undergoing upper gastrointestinal endoscopy at two referral centers between September, 2002 and May, 2007. H pylori infection was diagnosed when any of the four tests (RUT, culture, histopathology and PCR) were positive. Genotyping for -765G > C polymorphism of COX-2 was performed by PCR-RFLP analysis. RESULTS: Frequency of C carrier had significantassociation with gastric adenocarcinoma as compared to NUD [77.4% vs 29%, P < 0.001, odds ratio (OR) 8.20; 95% confidence interval (95% CI), 4.08-16.47] and PUD (77.4% vs 31.1%, P < 0.001; OR 8.04; 95% CI, 3.25-19.90). Risk of gastric adenocarcinoma was significantly higher in patients having C carrier with (OR 7.83; 95% CI 3.09-19.85) and without H pylori infection (OR 7.06; 95% CI, 2.61-19.09). Patients with C carrier and H pylori infection had significant risk for the development of PUD (P < 0.001; OR 5.65; 95% CI, 2.07-15.34). CONCLUSION: -765G > C COX-2 polymorphism with or without H pylori could be a marker for genetic susceptibility to gastric adenocarcinoma. COX-2 polymorphism in presence of H pylori infection might be useful in predicting the risk of PUD.

Single nucleotide polymorphism in DNA methyltransferase 3B promoter and its association with gastric cardiac adenocarcinoma in North China

AIM:To investigate the association between single nucleotide polymorphism (SNP) in promoter of the DNA methyltrans-ferase 3B(DNMT3B) gene and risk for development and lymphatic metastasis of gastric cardiac adenocarcinoma (GCA). METHODS: The hospital based case-control study included 212 GCA patients and 294 control subjects without overt cancer. The DNMT3B SNP was genotyped by PCR and restriction fragment length polymorphism (RFLP) analysis. RESULTS: The C/C genotype was not detected in both GCA patients and controls. In control subjects, the frequency of T/T and C/T genotypes was 94.9% and 5.1% respectively, and that of T and C alleles was 97.4% and 2.6%, respectively. The genotype and allelotype distribution in the GCA patients was not significantly different from that in controls (P=0.34 and 0.33, respectively). When stratified by smoking status and family history of upper gastrointestinal cancer, significant difference in the genotype distribution was not observed between GCA patients and controls. The distribution of DNMT3B genotypes in GCA patents with or without lymphatic metastasis did not show significant difference (P= 0.42). CONCLUSION: The distribution of DNMT3B SNP in North China is distinct from that in Caucasians. Although this SNP has been associated with susceptibility to lung, head, neck and breast cancer, it may not be used as a stratification marker to predict susceptibility and lymphatic metastasis of GCA, at least in the population of North China.

Polymorphisms of MTHFR and susceptibility to oesophageal adenocarcinoma in a Caucasian United Kingdom population

AIM: To identify if methylene tetra-hydrofolatereductase (MTHFR) C677T polymorphisms are associated with oesophageal adenocarcnomas in a Caucasian population and to test whether folic acid and homocysteine levels are linked with cancer risk.

GSTM1,GSTT1,GSTP1 and CYP1A1 genetic polymorphisms and susceptibility to esophageal cancer in a French population:Different pattern of squamous cell carcinoma and adenocarcinoma

AIM:To evaluate the association between CYP1A1 and GSTs genetic polymorphisms and susceptibility to esophageal squamous cell carcinoma(SCC)and esophageal adenocarcinoma(ADC)in a high risk area of northwest of France. METHODS:A case-control study was conducted to investigate the genetic polymorphisms of these enzymes (CYPIAI*2C and GSTP1 exon 7 Val alleles,GSTMI*2/*2 and GSTTl *2/*2 null genotypes).A total of 79 esophageal cancer cases and 130 controls were recruited. RESULTS:GSTMI*2/*2 and CYPIAI*IA/*2C genotype frequencies were higher among squamous cell carcinomas at a level dose to statistical significance(OR =1.83,95% CI 0.88-3.83,P=0.11;OR=3.03,95% CI 0.93-9.90,P=0.07, respectively).For GSTP1 polymorphism,no difference was found between controls and cases,whatever their histological status.Lower frequency of GSTT1 deletion was observed in ADC group compared to controls with a statistically significant difference(OR=13.31,95% CI 1.66-106.92,P<0.01). CONCLUSION:In SCC,our results are consistent with the strong association of this kind of tumour with tobacco exposure.In ADC,our results suggest 3 distinct hypotheses: (1)activation of exogenous procarcinogens,such as small halogenated compounds by GSTT1;(2)contribution of GSTT1 to the inflammatory response of esophageal mucosa,which is known to be a strong risk factor for ADC, possibly through leukotriene synthesis;(3)higher sensitivity to the inflammatory process associated with intracellular depletion of glutathione.

Mucinous neoplasm of the appendix:A case report and review of literature

BACKGROUND Appendiceal mucinous neoplasms(AMNs),although not classified as rare,are relatively uncommon tumors most often discovered incidentally during colorectal surgery.Accurate identification of AMNs is difficult due to non-specific sym-ptoms,overlapping tumor markers with other conditions,and the potential for misdiagnosis.This underscores the urgent need for precision in diagnosis to pre-vent severe complications.CASE SUMMARY This case report describes the unexpected discovery and treatment of a low-grade AMN(LAMN)in a 74-year-old man undergoing laparoscopic hemicolectomy for transverse colon adenocarcinoma(AC).Preoperatively,non-specific gastroin-testinal symptoms and elevated tumor markers masked the presence of AMN.The tumor,presumed to be an AMN peritoneal cyst intraoperatively,was con-firmed as LAMN through histopathological examination.The neoplasm exhibited mucin accumulation and a distinct immunohistochemical profile:Positive for Ho-meobox protein CDX-2,Cytokeratin 20,special AT-rich sequence-binding protein 2,and Mucin 2 but negative for cytokeratin 7 and Paired box gene 8.This profile aids in distinguishing appendiceal and ovarian mucinous tumors.Postoperative recovery was uncomplicated,and the patient initiated adjuvant chemotherapy for the colon AC.CONCLUSION This case highlights the diagnostic complexity of AMNs,emphasizing the need for vigilant identification to avert potential complications,such as pseudomyxoma peritonei.

Cyclooxygenase-2 polymorphisms and the risk of esophageal adeno-or squamous cell carcinoma

AIM： TO determine whether -1195 A→G and/or -765 G→C polymorphisms in Cyclooxygenase-2 CCOX-2） may have a risk modifying effect on the development of esophageal carcinoma in a Dutch Caucasian population. METHODS： Two study groups were recruited, 252 patients with esophageal carcinoma and 240 healthy controls, matched for race, age, gender and recruiting area. DNA was isolated from whole blood and used for genotyping. PCR products were digested with restriction enzymes and products were analyzed by agarose gel electrophoresis. Odds ratios （OR） and 95% confidence intervals （CI） were estimated. RESULTS： The distribution of the -1195A→G polymorphism was significantly different in esophageal cancer patients compared to controls. The -1195 GG genotype resulted in a higher risk of developing esophageal adenocarcinoma （OR = 3.85, 95% CI： 1.45-10.3） compared with the -1195AA genotype as a reference. The -765 G→C genotype distribution was not different between the two groups. The GG/ GG haplotype was present more often in esophageal adenocarcinoma patients than in controls （OR = 3.45, 95% CI： 1.24-9.58; with AG/AG as a reference）. The same trends were observed in patients with squamous cell carcinomas, however, the results did not reach statistical significance. CONCLUSION： Presence of the COX-2 -1195 GG genotype and of the GG/GG haplotype may result in a higher risk of developing esophageal carcinoma.

Differential gene expression profiling of gastric intraepithelial neoplasia and early-stage adenocarcinoma

AIM: To investigate the differentiated whole genome expression profiling of gastric high- and low-grade intraepithelial neoplasia and early-stage adenocarcinoma.

Variant TP53BP1 rs560191 G>C is associated with risk of gastric cardia adenocarcinoma in a Chinese Han population

Objective： To investigate the association between gastric cardia adenocarcinoma （GCA） and ten functional single nueleotide polymorphisms （SNPs）, including TPY3BPI rs560191 G〉C, CASP8 rs1035142 G〉T, CASP7 rs3127075 G〉C, CASP7 rs7907519 C〉A, and six C1 orf 10/CRNN variants. We performed a hospital- based case-control study to evaluate the genetic effects of these SNPs. Methods： Two hundred and forty-three GCA cases and 476 controls were enrolled in this study. A custom- by-design 48-Plex SNPscanTM Kit was used to determine their genotypes. Results： When the TP^3BP1 rs560191 GG homozygote genotype was used as the reference group, the GC genotype was associated with a significantly increased risk of GCA. The CC genotype was not associated with the risk of GCA compared with the GG genotype. None of the CASP8 rs1035142 G〉T, CASP7 rs3127075 G〉C, CASP7 rs7907519 C〉A or the six ClorflO/CRNN polymorphisms showed a significant difference in genotype distributions between the cases and the controls. Conciusions： The results demonstrated that the functional polymorphism TP53BPI rs560191 G〉C might contribute to GCA susceptibility. However, the statistical power of our study was limited. Large, well- designed studies and further functional investigations are needed to confirm our findings.

Association between esophageal cancer risk and EPHX1 polymorphisms:A meta-analysis

AIM: To summarize the relationship between p.Tyr113His and p.His139Arg polymorphisms in microsomal epoxide hydrolase (EPHX1) and risk for esophageal cancer (EC).

长链非编码RNA人肺腺癌转移相关转录本1在结直肠癌中的研究进展

长链非编码RNA(lncRNA)是一种长度大于200个核苷酸,且不具备蛋白质编码能力的RNA,其在癌症的发生发展中起重要作用。lncRNAs涉及转录、转录后修饰、染色质修饰以及表观遗传学修饰等多种基因调控过程,其是细胞周期、细胞分化发育、细胞多能性等生物过程中最重要的参与者。肺腺癌转移相关转录本1(MALAT1)作为被广泛研究的lncRNAs之一,在结直肠癌中呈高表达。研究已表明,MALAT1及其单核苷酸多态性(SNPs)在结直肠癌的发生发展中起重要作用,可成为结直肠癌临床诊断、治疗与预后的靶标。本文就lncRNA MALAT1在结直肠癌中的相关研究现状进行综述。

E-钙粘蛋白基因多态性与食管癌、贲门癌的关系

背景与目的:E-钙粘蛋白(E-cadherin,CDH1)是钙粘蛋白家族中的一个成员,与肿瘤侵袭转移密切相关。该基因启动子区存在的多态性位点可通过改变转录活性而影响该蛋白的表达。本研究旨在探讨该基因启动子区C-160A和G-347GA单核苷多态性(single nucleotide polym orphism,SNP)与中国北方人食管鳞状细胞癌(esophagealsquam ous cellcarcinom a,ESCC)、贲门腺癌(gastric cardiacadenocarcinom a,GCA)易感性和淋巴结转移的关系。方法:采用聚合酶链反应-限制性片段长度多态性(polym erase chain reaction-restrictionfragm entlength polym orphism,PCR-RFLP)分析方法检测333名ESCC患者、239名GCA患者和343名健康对照的CDH1C-160A及G-347GA SNP的基因型。结果:CDH1C-160A及G-347GA SNP的基因型及等位基因型分布在总体ESCC患者、GCA患者和健康对照中无显著性差异(P=0.08)。根据吸烟状况及上消化道肿瘤家族史分层分析及淋巴结转移状况的分析也未发现CDH1SNPs对ESCC和GCA发病及淋巴结转移的影响。然而,与G-347GA G/G基因型相比,携带GA等位基因(G/GA+GA/GA基因型)可显著增加GCA患病风险,经性别、年龄校正后的OR值为1.45(95%CI=1.03～2.04)。应用EH软件分析显示。

XPC基因Ala499Val、Lys939Gln多态与食管癌、贲门癌发病风险的关联

背景与目的:XPC基因参与核苷酸切除修复,该基因存在单核苷酸多态性(SNP)位点,并可能通过SNP位点碱基的改变影响其修复能力及疾病易感性。本研究旨在探讨XPC基因第8外显子Ala499Val及第15外显子Lys939GlnSNP与河北省食管癌、贲门癌高发区—磁县和涉县人群食管鳞状细胞癌(esophagealsguamouscellcarcinoma,ESCC)和贲门腺癌(gastriccardiacadenocorcinoma,GCA)遗传易感性的关系。方法:采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)分析方法检测327例ESCC患者、253例GCA患者和612名健康对照的XPC基因第8外显子Ala499Val及第15外显子Lys939GlnSNP的基因型。结果:ESCC患者组、GCA患者组上消化道肿瘤家族史阳性个体比例明显高于对照组,上消化道肿瘤家族史可增加ESCC、GCA的发病风险(经性别和年龄校正后的OR=1.76和1.77,95%CI=1.34～2.32和1.31～2.39)。ESCC患者组和对照组的XPC基因第8外显子C、T等位基因频率及C/C、C/T、T/T基因型分布差异均无显著性(P>0.05)。GCA患者组T等位基因频率(26.5%)显著低于对照组(32.5%),两组相比差异有显著性(χ2=6.12,P=0.01);与C/C基因型相比,携带C/T基因型可显著降低GCA的发病风险(OR=0.62,95%CI=0.45～0.84)。根据吸烟状况和上消化道肿瘤家族史进行分层分析发现,与C/C基因型相比,携带C/T基因型可显著降低吸烟个体和家族史阴性个体GCA的发病风险(OR均等于0.57,95%CI=0.36～0.91和0.37～0.88)。在ESCC、GCA患者组和对照组之间,XPC第15外显子A、C等位基因频率及A/A、A/C、C/C基因型分布差异均无显著性(P>0.05)。根据吸烟状况和上消化道肿瘤家族史进行分层分析发现,与A/A基因型相比,携带C/C基因型可显著增加非吸烟个体ESCC的发病风险(OR=2.05,95%CI=1.15～3.66)。单体型分析显示,A/T、A/C、C/T、C/C四种单体型,在ESCC患者组与对照组之间分布差异无显著性(P>0.05);在GCA患者组与对照组之间分布差异有显著性(P=0.02)。与A/T单体型相比,携带A/C、C/C单体型可显著增加GCA的发病风险(OR=1.35和1.46,95%CI=1.01～1.81和1.06～2.00)。结论:在河北省食管癌、贲门癌高发区—磁县和涉县人群中,携带XPC基因第8外显子C/T基因型可能明显降低GCA的发病风险;第15外显子Lys939GlnSNP可能与ESCC、GCA的发病风险无关,但分层分析发现携带第15外显子C/C基因型可能增加非吸烟个体ESCC的发病风险;携带A/C、C/C单体型可能增加GCA的发病风险。

53BP1和p53基因多态性与食管鳞癌、贲门腺癌遗传易感性的关系

背景与目的:p53结合蛋白1(53BP1)可通过增强p53的转录活性,而在肿瘤抑制方面发挥重要作用。在53BP1的启动子区-885bp处存在着T到G的单核苷酸多态性(single nucleotide polymorphism,SNP)。本实验探讨53BP1 T885G基因多态性以及p53 Arg72Pro的多态性与中国河北高发区人群食管鳞癌(esophageal squamous cell carcinoma,ESCC)和贲门腺癌(gastric cardiac adenocarcinoma,GCA)遗传易感性的关系。方法:应用引物引入限制性内切酶分析-聚合酶链反应(primer-introduced restriction analysis-polymerase chain reaction,PIRA-PCR)方法,分析624例患者(其中ESCC349例,GCA275例)和635例健康对照者的53BP1 T885G和p53 Arg72Pro的基因型。结果:53BP1 T885G基因型分布在总体ESCC、GCA病例组与健康对照组间差异无统计学意义(P>0.05)。根据吸烟状况和上消化道肿瘤(upper gastrointestinal cancer,UGIC)家族史分层分析显示,T885G基因型分布在病例组与健康对照组差异亦无统计学意义(P>0.05)。与Arg/Arg基因型相比,携带p53Arg72Pro Pro/Pro基因型可降低总体GCA的发病风险,经性别、年龄、吸烟状况和UGIC家族史多因素校正后的OR值为0.79(95%CI=0.64～0.98);分层分析显示Pro/Pro基因型主要降低非吸烟组GCA的发病风险,校正后的OR值为0.72(95%CI=0.54～0.97)。未发现p53Arg72Pro对ESCC发病风险的影响。53BP1T885G和p53Arg72Pro联合分析显示,在携带Pro等位基因(Arg/Pro+Pro/Pro基因型)者中,同时携带T885G的G/G基因型可降低GCA的发病风险,校正后的OR值为0.74(95%CI=0.57～0.95)。结论:53BP1T885G位点可能与中国河北高发区ESCC、GCA的遗传易感性无关,p53Arg72Pro的Pro/Pro基因型可降低高发区GCA的发病风险,同时携带Pro等位基因(Arg/Pro+Pro/Pro基因型)和53BP1 T885G的G/G基因型可降低高发区GCA的发病风险。

XRCC1多态性与非吸烟女性肺腺癌易感性的关系

背景与目的XRCC1是一种DNA损伤修复基因,其单核苷酸多态性异常是导致DNA修复能力个体差异的重要原因,可能导致个体患肺癌的危险升高。本研究的目的是探讨XRCC1单核苷酸多态性与非吸烟女性肺腺癌易感性的关系。方法采用以医院患者为基础的病例—对照研究方法,研究对象包括非吸烟女性肺腺癌患者126例和同期其它肺部疾病对照126例。以聚合酶链反应限制性片段长度多态性方法分析XRCC1基因Arg399Gln多态性,比较不同基因型与非吸烟女性肺腺癌的关系,并探讨油烟暴露与基因多态交互作用对患癌风险的影响。结果与携带399Arg/Arg基因型者比较,携带399Gln/Gln基因型者患肺腺癌的风险是其8.695倍(95%CI为3.343～22.614)。携带等位基因399Gln又有油烟暴露的个体患肺腺癌的风险明显增高,校正的比值比为5.21(95%CI为1.85～14.70,P<0.001)。结论XRCC1基因Arg399Gln多态性可能是非吸烟女性肺腺癌的遗传易感因素。

腮腺多形性低度恶性腺癌1例报道并文献复习

目的 探讨多形性低度恶性腺癌 (小叶性或终末导管癌 )的临床病理特点、诊断及鉴别诊断。方法 通过光镜和免疫组化 ,对 1例腮腺多形性低度恶性腺癌进行病理组织学观察。结果 多形性低度恶性腺癌细胞形态较单一 ,但组织结构具有多样性。上皮膜抗原 (EMA)呈阳性。结论 这是一种不常见的肿瘤 ,多发于小涎腺 ,尤其是腭部 ,腮腺少见。尽管其具有浸润性生物学行为 ,但仍属于低度恶性肿瘤。彻底切除病变 ,可防止肿瘤复发。

细胞因子基因多态性与胃腺癌发生及其临床病理特点的关系

目的探讨肿瘤坏死因子α(TNF-α)和白细胞介素6(IL-6)基因单核苷酸多态性(SNP)与胃腺癌合并或未合并幽门螺杆菌(Hp)感染的关系。方法采用基因芯片技术检测130例胃腺癌患者(胃癌组)和142例健康对照人群(对照组)中TNF-α-238G/A,-308G/A和IL-6-597G/A,-174G/C,-572G/C位点多态性。同时应用酶联免疫吸附试验(ELISA)测定两组血清中Hp-IgG/IgM/IgA型抗体浓度。结果胃癌组Hp的感染阳性率明显高于对照组(P<0.01,相对危险度[OR]=2.59)。TNF-α-238GA基因型和A等位基因频率,胃癌组明显高于对照组(P<0.01,OR=2.44;P<0.01,OR=2.13);Hp阳性胃癌组明显高于Hp阴性胃癌(P<0.05,OR=4.53;P<0.01,OR=3.52);低分化胃癌组显著高于高分化胃癌组(P<0.05,OR=4.16)。胃癌组IL-6-572CC基因型频率明显低于对照组(P<0.01,OR=0.17)。未见TNF-α和IL-6其他位点的SNP与胃癌组或Hp阳性胃癌组有任何相关性。结论TNF-238GA基因型及其等位基因A与胃腺癌或感染Hp的胃腺癌易感性相关,而IL-6-572CC基因型则能降低胃腺癌易感性。

MDM2基因多态性与食管鳞癌、贲门腺癌易感性的关系

目的：研究MDM2启动子区SNP309和Dell 518基因多态性与中国河北省高发区人群食管鳞状细胞癌（esophageal squamous cell carcinoma，ESCC）和贲门腺癌（gastric cardiac adenocarcinoma，GCA）易感性的关系。方法：应用引物引入限制性内切酶分析-聚合酶链反应（primer-introduced restriction analysis-polymerase chain reaction，PIRA-PCR）方法，分别检测了351例ESCC患者、212例GCA患者和642例健康对照组人群的MDM2启动子区SNP309和Dell518的基因型。应用EH和2LD软件分析两个多态性位点的相互关系。结果：MDM2基因型分布在总体ESCC患者组和健康对照组间无显著性差异（P〉0．05），而在总体GCA患者组与健康对照组间存在的差异有统计学意义（P〈0．05）。单体型分析显示，MDM2单体型分布在ESCC患者组与健康对照组间差异无统计学意义（P=0．198），而在GCA患者组与健康对照组间有显著性差异（P=0．000）。与SNP309G／Dell518＋单体型相比，检出SNP309T／Dell518-单体型组可显著降低GCA的发病风险（OR=0．51，95％CI=0．38～0．70）。结论：MDM2的SNP309和Dell518多态性与ESCC的发病风险可能无关；携带MDM2SNP309T等位基因的基因型（G／T与T／T）和携带Dell518-等位基因的基因型（＋／-与-／-）可分别降低GCA的发病风险：MDM2SNP309T／Dell518-单体型组可以降低GCA的发病风险。

贲门癌组织CYP1A1和CYP2E1基因多态变化

目的 :对河南贲门癌高发区林州市贲门癌组织代谢酶基因CYP1A1与CYP2E1的多态性进行检测 ,更深入了解该地区贲门癌变易感性分子机制。方法 :利用“病例 对照”设计 ,采用PCR RFLP和PCR SSCP方法对 19例贲门腺癌和 72例正常对照组织中代谢酶基因CYP1A1、CYP2E1的多态型进行检测。结果 :贲门腺癌与正常对照组织中 ,CYP2E1在 5’侧翼区域的RsaI基因多态 (c2 )分别占 2 6 %和 36 % ,c2基因变体能够降低个体对贲门癌的易感性(OR =0 .5 1) ;CYP2E1的DC和CC基因型合并在一起分别为 32 %和 4 8% ,C基因变体也能够降低个体对贲门癌的易感性 (OR =0 .5 0 ) ;CYP1A1的TC和CC合并在一起分别占 5 3%和 6 7% ,C等位基因并未影响个体对贲门癌的易感性 (OR =0 .80 ) ;2种组织中均未在CYP1A1基因第 7内含子内检测出Ile/Val基因多态。结论 :CYP1A1基因多态对贲门癌易感性无明显影响 。