IL-1B及IL-1RN基因多态性与幽门螺杆菌相关的胃十二指肠疾病

白细胞介素-1(Intedukin-1，IL-1)有两种类型：IL-1α和IL-1β，以IL-1β为主，主要由活化的单核巨噬细胞产生，与IL-1受体(IL-1R)结合后产生生物学作用。IL-1β是一个非常重要的前炎症细胞因子，在炎症免疫损伤机制中起着主要的调节作用。同时具有强大的抑制胃酸分泌作用，在幽门螺杆菌(Helicobacter pylori，Hp)感染的胃黏膜损伤和萎缩性胃炎发展及胃癌发生中起重要作用。IL-1受体拮抗剂(IL-1Rα)是IL-1家族的另一成员．     

宿主免疫基因多态性与幽门螺杆菌感染相关疾病的关系

幽门螺杆菌(Helicobacter pylori,H.pylori)感染与消化性溃疡、萎缩性胃炎、胃MALT(Mucosa-associated lymphoid tissue)淋巴瘤及胃癌等疾病的发生密切相关。H.pylori感染引起的不同临床结局主要与H.pylori致病因子、宿主因素和环境因素三方面有关。目前宿主基因易感性的差异在H.pylori感染致病的作用已成为研究热点,本文就宿主免疫基因的多态性与幽门螺杆菌感染所致疾病关系的研究进行总结,从宿主TOLL样受体、NOD受体、CD14及HLA等免疫因子基因多态性进行综述。     

IL-1B基因多态性与幽门螺旋杆菌感染后胃癌发病的关系

取35例胃癌(胃癌组)及37例慢性胃炎(对照组)患者全血标本,使用基因芯片检测技术,结合PCR 体外扩增方法,检测人IL1B-31和-511位点基因多态性,并用13C尿素呼气试验、免疫印迹试验检测Hp感染情况.结果胃癌组Hp感染率高于对照组(P＜0.05),胃癌组IL-1B-31位点T携带子的频率高于对照组(P＜0.05).与C/C型比较,T携带子基因型者发生胃癌的风险增加,OR=4.237(95%CI:1.563～10.000);IL-1B-511位点的各基因型频率在两组间差异无统计学意义(P＞0.05).认为IL-1B-31位点基因多态性可能增加Hp感染后中国人发生胃癌的危险性.     

TGF-β1-509C/T基因多态性与胃十二指肠疾病幽门螺杆菌感染的关系

目的研究TGF-β1基因-509位点C/T多态性与胃十二指肠疾病易感性的关系。方法采用聚合酶链反应-限制性片段长度多态性方法,检测40例慢性胃炎,38例消化性溃疡,62例非贲门胃癌患者和102例正常对照者TGF-β1基因-509位点C/T等位基因及基因型分布,并对该基因多态性与幽门螺杆菌感染的相关性进行分析。结果 TGF-β1等位基因频率及基因型频率在病例组和对照组的分布无显著性差异;将胃十二指肠疾病患者按幽门螺杆菌感染分层后,结果提示TGF-β1基因型及等位基因频率分布无显著性差异。结论 TGF-β1-509位点基因多态性与胃十二指肠疾病幽门螺杆菌感染无关。     

细胞因子基因多态性和幽门螺杆菌相关性疾病

大多数幽门螺杆菌 (Hp)感染者仅存在慢性胃炎 ,但少数感染者可发展为消化性溃疡、胃黏膜相关淋巴组织(MALT)淋巴瘤或胃癌。Hp和宿主是一个相互作用的整体。首先 ,Hp必须历经进化上的改变才能在宿主的免疫反应下存活 ,毒力菌株在疾病的发展中起作用 ,但Hp毒力的强弱不能完全解释溃疡和胃癌的发生。其次是宿主因素 ,如宿主感染Hp时的年龄在一定程度上就影响宿主和Hp相互作用的结局。随着年龄的增长 ,胃、十二指肠溃疡的发病率逐渐上升。基因易感性同样也很重要 ,有家族史患者的胃溃疡、十二指肠炎和十二指肠溃疡发生的危险性高于无家族史…     

幽门螺杆菌细胞毒相关基因A与白细胞介素-8

本文阐述幽门螺杆菌细胞毒相关基因A与白细胞介素-8的相关性及其诱导机制,为探讨幽门螺杆菌的致病机制以及在消化道疾病中的作用提供了有价值的依据。     

IL-1B基因多态性与糖尿病及牙周病的相关性研究

目的探讨IL-1B基因多态性在糖尿病及牙周病发病中的作用。方法将60只雄性SD大鼠随机分为4组各15只，N组及P组予普通饲料，DM组及DP组予高糖、高脂饲料并尾静脉注射链脲佐菌素建立2型糖尿病模型；P组及DP组采用正畸丝结扎建立牙周病模型。记录各组一般情况；8周后处死大鼠，观察牙周组织学改变，并取静脉血采用聚合酶链式反应-限制性片段长度多态（PCR—RFLP）方法对IL-1B＋3693／Taql多态性进行检测。结果DM组及DP组糖尿病症状明显，DP组牙槽骨丧失严重；大鼠IL-1B基因外显子V的第3693位核苷酸处存于TaqI限制性内切酶识别位点，其PCR产物酶切后出现163bp和102bp两个片段，各组均表现一种基因型TaqII／I。结论本研究成功制备出2型糖尿病伴牙周病大鼠模型，IL-1B基因多态性与2型糖尿病及牙周病无明显相关性。     

湖南籍汉族强直性脊柱炎患者IL-1RN IL-1β基因多态性分析

目的研究白细胞介素(IL)-1RN、IL-1β基因多态性与强直性脊柱炎(AS)的相关性。方法自100例AS患者及92名健康对照者外周血中提取DNA,采用PCR-SSP方法检测IL-IRN基因第二内含子VNTR复等位基因及IL-1β基因 3953单核苷酸多态性。结果AS患者中IL-IRN*2等位基因频率显著高于健康对照者。结论AS与IL-1RN*2等位基因相关联。     

白细胞介素-1β介导幽门螺杆菌相关胃癌发生的实验研究

目的 探讨白细胞介素(IL)-1β在幽门螺杆菌(Hp)相关胃癌发生中可能的作用机制.方法 以人胃永生化上皮细胞株(GES-1)和胃癌细胞株(AGS)为研究对象,采用四甲基偶氮唑盐比色法测定IL-1β对细胞增殖的影响,流式细胞术碘化丙啶单染法测定IL-1β对Hp(NCTC 11637)诱导细胞凋亡的影响.分别应用RT-PCR法和流式细胞术(荧光定量法)检测IL-1β对细胞环氧合酶-2(COX-2)mRNA和蛋白表达的影响.以兔离体壁细胞为研究对象,应用14C-氨基比林(14C-AP)摄取法检测IL-1β对组胺刺激壁细胞酸分泌的影响,应用RT-PCR法分析IL-1β对壁细胞H+-K+-ATP酶α亚基mRNA表达的影响.结果 IL-1β能刺激GES-1和AGS细胞增殖,抑制Hp诱导的GES-1和AGS细胞凋亡.IL-1β能诱导GES-1 COX-2表达,上调AGS细胞COX-2表达;诱导GES-1和AGS细胞COX-2蛋白表达上调(分别由1.016±0.020和1.070±0.034上调至1.485±0.220和1.501±0.182).IL-1β能抑制组胺刺激的离体壁细胞酸分泌,同时伴H+-K+-ATP酶α亚基mRNA表达下调.结论 IL-1β可能通过两条途径在Hp相关胃癌发生中起作用:上调COX-2表达,破坏胃上皮细胞增殖、凋亡平衡和下调H+-K+-ATP酶表达以抑制壁细胞分泌.     

幽门螺杆菌jhp基因与胃十二指肠疾病的关系

幽门螺杆菌（H.pylori）是一类基因组结构变异较大的细菌。除具有一般共同特征、看家基因、插入序列、致病岛和质粒外，还具有特殊的毒力基因。H.pylori基因组结构的不断阐明。为其临床和流行病学研究以及感染的预防和控制打下了坚实的基础。新发现的H.pylori致病因子，如jhp0917-0918、jhp0947和jhp0949基因均与胃十二指肠疾病相关。提示其可能成为H.pylori新的流行病学标志。     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

目的 研究我同湖北汉族人群IL-10及TNF的基因多态性与胃十二指肠疾病及幽门螺杆菌(Hp)感染的关系.方法 采用病例财照研究和聚合酶链反应.限制性片段长度多态性(PCR-RFLP)方法检测605例胃十二指肠疾病患者(包括196例慢性胃炎、189例胃十二指肠溃疡及220例胃癌患者)和624例健康对照者中IL-10基因启动子区3个位点(IL-10-1082/-819/-592)的等位基因型和TNFα-308、LTα(淋巴毒素α,亦称TNFβ)Nco Ⅰ、AspH Ⅰ双等位基因型分布;用ELISA法检测血清中Hp-IgG及cagA-IgG抗体水平.结果 (1)IL-10-1082 AG+GG基因型在胃癌组、慢性胃炎组及胃十二指肠溃疡组(非胃癌组)、健康对照组分布频率分别为20.0%、7.5%、6.0%和5.0%,IL-10-1082 AG+GG基因型分布在非胃痛组及健康对照组之间差异无统计学意义(P>0.05),而胃癌组高于非胃癌组(P<0.05)及健康对照组(P<0.05),其差异均有统计学意义.胃癌组中IL-10-592及-819两个位点与非胃癌组及健康对照组比较,基因型分布差异无统计学意义(P>0.05).IL-10-819位点与IL-10-592位点基因型分布频率一致.(2)胃癌组与其余3组比较,IL-10-1082 AG+GG基因型且Hp阳性的分布频率的差异有统计学意义(P<0.05).(3)LTα Nco Ⅰ AG基因型在Hp阳性胃癌患者中(66.7%)高于Hp阳性的健康对照组(47.8%),差异有统计学意义(P<0.05),该基因型与其他胃十二指肠疾病尤相关性.TNFα-308、LTα AspH Ⅰ与Hp感染及胃十二指肠疾病亦无相关性.结论 (1)IL-10-1082 AG+GG基因型与湖北地区汉族人群胃癌发生有相关性.(2)IL-10-1082 AG+GG基因型和LTα Nco Ⅰ AG基因型与湖北汉族人群Hp阳性胃癌有相关性.     

幽门螺杆菌iceA、cagA相关性研究

目的研究幽门螺杆菌(Helicobecterpylori)cagA、iceA与胃十二指肠疾病的关系及二者的相关性。方法从138例胃黏膜活检组织中分离培养H·pylori,PCR扩增检测cagA、iceA,并测序。结果cagA /iceA1 /iceA2 在消化性溃疡中的阳性率明显高于慢性胃炎和胃癌。cagA、iceA1同时阳性为55·4%(62/112),cagA阴性iceA1阳性为11·5%(3/26),存在统计学差异。cagA、iceA2同时阳性为51·8%(58/112),cagA阴性iceA2阳性为30·8%(8/26),存在统计学差异。结论cagA /iceA1 /iceA2 菌株可能与消化性溃疡的发生、发展相关,cagA和iceA1可能存在协同作用,和iceA2关系不大。     

上海人幽门螺杆菌vac A基因表型与相关胃肠疾病

目的 探讨用ｖａｃＡ基因表型检测对幽门螺力（Ｈｐ）进行分型,并分析不同基因型与相关胃肠疾病之间的关系,方法 对临床胃黏膜标本中Ｈｐ菌株进行分离培养及其总ＲＮＡ抽提,逆转录聚合酶链反应检测ｖａｃＡ基因表型,结果 ５０株临床分离Ｈｐ菌株ｖａｃＡ基因表型ｓｌ／ｍ２型４６株（２％）ｓｌ／ｍｌ型４株（８％）,未发现ｓ２型,结论 上海人Ｈｐ菌株ｖａｃＡ基因绝大多数表达ｓ１／ｍ２型,ｓｌ／ｍ２基因表型分布于所有     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

Objective To study the distribution of IL-10 and TNF gene polymorphisms in patients with gastroduodenal diseases in Hubei Han ethnic and their association with Helicobacter pylori (Hp) infection. Methods Six hundred and five patients with gastroduedenal diseases (196 chronic gastritis, 189 gastroduodenal ulcer and 220 gastric cancer) as well as 624 healthy controls were genotyped with PCR-RFLP method for IL-10-1082,-819,-592 and TNFα-308, lymphotoxin-α (LTα) Nco Ⅰ and AspH Ⅰ gene polymorphisms. Hp infection status was determined with ELLS& Results (1) There was significant difference of IL-10-1082 AG + GG genotype among the gastric cancer group with the non-malignant gastric diseases groups and healthy control group (P <0. 05). There was no significant difference of IL-10-592 and -819 gene polymorphisms among gastric cancer patients,non-malignant gastric disease patients and healthy controls (P>0. 05). The genotype frequencies of IL-10-819 were the same as those of IL-10-592. (2) Frequency of IL-10-1082 AG + GG genotype in gastric cancer patients with positive Hp was significantly higher than that in the other three groups (P < 0. 05). (3) Frequency of LTα Nco I AG genotype in gastric cancer patients with Hp infection was signiilcandy higher than that in Hp positive healthy controls (P < 0. 05). There were no other associations between TNFα-308, LTα Nco Ⅰ and AspH Ⅰ gene polymorphisms and Hp infection in gastroduodenal diseases. Conclusions (1) Allele AG + GG of IL-10-1082 was associated with gastric cancer in Han nationality of Hubei province. (2) IL-10-1082 AG + GG,LTct Nco ⅠAG heterozygous genotype may be associated with Hp infection in patients with gastric cancer in Han nationality of Hubei province.     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

Objective To study the distribution of IL-10 and TNF gene polymorphisms in patients with gastroduodenal diseases in Hubei Han ethnic and their association with Helicobacter pylori (Hp) infection. Methods Six hundred and five patients with gastroduedenal diseases (196 chronic gastritis, 189 gastroduodenal ulcer and 220 gastric cancer) as well as 624 healthy controls were genotyped with PCR-RFLP method for IL-10-1082,-819,-592 and TNFα-308, lymphotoxin-α (LTα) Nco Ⅰ and AspH Ⅰ gene polymorphisms. Hp infection status was determined with ELLS& Results (1) There was significant difference of IL-10-1082 AG + GG genotype among the gastric cancer group with the non-malignant gastric diseases groups and healthy control group (P <0. 05). There was no significant difference of IL-10-592 and -819 gene polymorphisms among gastric cancer patients,non-malignant gastric disease patients and healthy controls (P>0. 05). The genotype frequencies of IL-10-819 were the same as those of IL-10-592. (2) Frequency of IL-10-1082 AG + GG genotype in gastric cancer patients with positive Hp was significantly higher than that in the other three groups (P < 0. 05). (3) Frequency of LTα Nco I AG genotype in gastric cancer patients with Hp infection was signiilcandy higher than that in Hp positive healthy controls (P < 0. 05). There were no other associations between TNFα-308, LTα Nco Ⅰ and AspH Ⅰ gene polymorphisms and Hp infection in gastroduodenal diseases. Conclusions (1) Allele AG + GG of IL-10-1082 was associated with gastric cancer in Han nationality of Hubei province. (2) IL-10-1082 AG + GG,LTct Nco ⅠAG heterozygous genotype may be associated with Hp infection in patients with gastric cancer in Han nationality of Hubei province.     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

Objective To study the distribution of IL-10 and TNF gene polymorphisms in patients with gastroduodenal diseases in Hubei Han ethnic and their association with Helicobacter pylori (Hp) infection. Methods Six hundred and five patients with gastroduedenal diseases (196 chronic gastritis, 189 gastroduodenal ulcer and 220 gastric cancer) as well as 624 healthy controls were genotyped with PCR-RFLP method for IL-10-1082,-819,-592 and TNFα-308, lymphotoxin-α (LTα) Nco Ⅰ and AspH Ⅰ gene polymorphisms. Hp infection status was determined with ELLS& Results (1) There was significant difference of IL-10-1082 AG + GG genotype among the gastric cancer group with the non-malignant gastric diseases groups and healthy control group (P <0. 05). There was no significant difference of IL-10-592 and -819 gene polymorphisms among gastric cancer patients,non-malignant gastric disease patients and healthy controls (P>0. 05). The genotype frequencies of IL-10-819 were the same as those of IL-10-592. (2) Frequency of IL-10-1082 AG + GG genotype in gastric cancer patients with positive Hp was significantly higher than that in the other three groups (P < 0. 05). (3) Frequency of LTα Nco I AG genotype in gastric cancer patients with Hp infection was signiilcandy higher than that in Hp positive healthy controls (P < 0. 05). There were no other associations between TNFα-308, LTα Nco Ⅰ and AspH Ⅰ gene polymorphisms and Hp infection in gastroduodenal diseases. Conclusions (1) Allele AG + GG of IL-10-1082 was associated with gastric cancer in Han nationality of Hubei province. (2) IL-10-1082 AG + GG,LTct Nco ⅠAG heterozygous genotype may be associated with Hp infection in patients with gastric cancer in Han nationality of Hubei province.     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

Objective To study the distribution of IL-10 and TNF gene polymorphisms in patients with gastroduodenal diseases in Hubei Han ethnic and their association with Helicobacter pylori (Hp) infection. Methods Six hundred and five patients with gastroduedenal diseases (196 chronic gastritis, 189 gastroduodenal ulcer and 220 gastric cancer) as well as 624 healthy controls were genotyped with PCR-RFLP method for IL-10-1082,-819,-592 and TNFα-308, lymphotoxin-α (LTα) Nco Ⅰ and AspH Ⅰ gene polymorphisms. Hp infection status was determined with ELLS& Results (1) There was significant difference of IL-10-1082 AG + GG genotype among the gastric cancer group with the non-malignant gastric diseases groups and healthy control group (P <0. 05). There was no significant difference of IL-10-592 and -819 gene polymorphisms among gastric cancer patients,non-malignant gastric disease patients and healthy controls (P>0. 05). The genotype frequencies of IL-10-819 were the same as those of IL-10-592. (2) Frequency of IL-10-1082 AG + GG genotype in gastric cancer patients with positive Hp was significantly higher than that in the other three groups (P < 0. 05). (3) Frequency of LTα Nco I AG genotype in gastric cancer patients with Hp infection was signiilcandy higher than that in Hp positive healthy controls (P < 0. 05). There were no other associations between TNFα-308, LTα Nco Ⅰ and AspH Ⅰ gene polymorphisms and Hp infection in gastroduodenal diseases. Conclusions (1) Allele AG + GG of IL-10-1082 was associated with gastric cancer in Han nationality of Hubei province. (2) IL-10-1082 AG + GG,LTct Nco ⅠAG heterozygous genotype may be associated with Hp infection in patients with gastric cancer in Han nationality of Hubei province.     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

Objective To study the distribution of IL-10 and TNF gene polymorphisms in patients with gastroduodenal diseases in Hubei Han ethnic and their association with Helicobacter pylori (Hp) infection. Methods Six hundred and five patients with gastroduedenal diseases (196 chronic gastritis, 189 gastroduodenal ulcer and 220 gastric cancer) as well as 624 healthy controls were genotyped with PCR-RFLP method for IL-10-1082,-819,-592 and TNFα-308, lymphotoxin-α (LTα) Nco Ⅰ and AspH Ⅰ gene polymorphisms. Hp infection status was determined with ELLS& Results (1) There was significant difference of IL-10-1082 AG + GG genotype among the gastric cancer group with the non-malignant gastric diseases groups and healthy control group (P <0. 05). There was no significant difference of IL-10-592 and -819 gene polymorphisms among gastric cancer patients,non-malignant gastric disease patients and healthy controls (P>0. 05). The genotype frequencies of IL-10-819 were the same as those of IL-10-592. (2) Frequency of IL-10-1082 AG + GG genotype in gastric cancer patients with positive Hp was significantly higher than that in the other three groups (P < 0. 05). (3) Frequency of LTα Nco I AG genotype in gastric cancer patients with Hp infection was signiilcandy higher than that in Hp positive healthy controls (P < 0. 05). There were no other associations between TNFα-308, LTα Nco Ⅰ and AspH Ⅰ gene polymorphisms and Hp infection in gastroduodenal diseases. Conclusions (1) Allele AG + GG of IL-10-1082 was associated with gastric cancer in Han nationality of Hubei province. (2) IL-10-1082 AG + GG,LTct Nco ⅠAG heterozygous genotype may be associated with Hp infection in patients with gastric cancer in Han nationality of Hubei province.     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

Objective To study the distribution of IL-10 and TNF gene polymorphisms in patients with gastroduodenal diseases in Hubei Han ethnic and their association with Helicobacter pylori (Hp) infection. Methods Six hundred and five patients with gastroduedenal diseases (196 chronic gastritis, 189 gastroduodenal ulcer and 220 gastric cancer) as well as 624 healthy controls were genotyped with PCR-RFLP method for IL-10-1082,-819,-592 and TNFα-308, lymphotoxin-α (LTα) Nco Ⅰ and AspH Ⅰ gene polymorphisms. Hp infection status was determined with ELLS& Results (1) There was significant difference of IL-10-1082 AG + GG genotype among the gastric cancer group with the non-malignant gastric diseases groups and healthy control group (P <0. 05). There was no significant difference of IL-10-592 and -819 gene polymorphisms among gastric cancer patients,non-malignant gastric disease patients and healthy controls (P>0. 05). The genotype frequencies of IL-10-819 were the same as those of IL-10-592. (2) Frequency of IL-10-1082 AG + GG genotype in gastric cancer patients with positive Hp was significantly higher than that in the other three groups (P < 0. 05). (3) Frequency of LTα Nco I AG genotype in gastric cancer patients with Hp infection was signiilcandy higher than that in Hp positive healthy controls (P < 0. 05). There were no other associations between TNFα-308, LTα Nco Ⅰ and AspH Ⅰ gene polymorphisms and Hp infection in gastroduodenal diseases. Conclusions (1) Allele AG + GG of IL-10-1082 was associated with gastric cancer in Han nationality of Hubei province. (2) IL-10-1082 AG + GG,LTct Nco ⅠAG heterozygous genotype may be associated with Hp infection in patients with gastric cancer in Han nationality of Hubei province.     

白细胞介素-10和肿瘤坏死因子基因多态性与湖北汉族人群胃十二指肠疾病及幽门螺杆菌感染的相关性

Objective To study the distribution of IL-10 and TNF gene polymorphisms in patients with gastroduodenal diseases in Hubei Han ethnic and their association with Helicobacter pylori (Hp) infection. Methods Six hundred and five patients with gastroduedenal diseases (196 chronic gastritis, 189 gastroduodenal ulcer and 220 gastric cancer) as well as 624 healthy controls were genotyped with PCR-RFLP method for IL-10-1082,-819,-592 and TNFα-308, lymphotoxin-α (LTα) Nco Ⅰ and AspH Ⅰ gene polymorphisms. Hp infection status was determined with ELLS& Results (1) There was significant difference of IL-10-1082 AG + GG genotype among the gastric cancer group with the non-malignant gastric diseases groups and healthy control group (P <0. 05). There was no significant difference of IL-10-592 and -819 gene polymorphisms among gastric cancer patients,non-malignant gastric disease patients and healthy controls (P>0. 05). The genotype frequencies of IL-10-819 were the same as those of IL-10-592. (2) Frequency of IL-10-1082 AG + GG genotype in gastric cancer patients with positive Hp was significantly higher than that in the other three groups (P < 0. 05). (3) Frequency of LTα Nco I AG genotype in gastric cancer patients with Hp infection was signiilcandy higher than that in Hp positive healthy controls (P < 0. 05). There were no other associations between TNFα-308, LTα Nco Ⅰ and AspH Ⅰ gene polymorphisms and Hp infection in gastroduodenal diseases. Conclusions (1) Allele AG + GG of IL-10-1082 was associated with gastric cancer in Han nationality of Hubei province. (2) IL-10-1082 AG + GG,LTct Nco ⅠAG heterozygous genotype may be associated with Hp infection in patients with gastric cancer in Han nationality of Hubei province.