MTHFR基因A1298C多态性与肠癌遗传易感相关性研究

目的:探讨亚甲基四氢还原酶基因(MTHFR)第7外显子区单核苷酸多态(single nucleotide polymorphism,SNP)位点A1298C(rs1801131)与中国南方人群肠癌发生的相关性.方法:应用基质辅助激光解吸电离飞行时间(MALDI-TOF)质谱检测224例肠癌和224例对照MTHFR基因多态位点rs1801131的基因型.结果:MTHFR rs1801131多态位点AA、AC、CC三种基因型在肠癌的频率为63.4%、32.6%和4.0%,与对照组(68.8%,29.9%和3%)相比差异不显著(P=0.12);但男性人群中病例组和正常组的基因型差异接近显著(P=0.05),携带CC基因型男性个体的肠癌发病风险显著增加(OR=8.38,95%CI:1.01-69.64);相对于直肠癌,结肠癌与正常对照的基因型频率差别更大,P值分别为0.84和0.08;且男性结肠癌患者基因型分布和对照差异显著(P=0.01).结论:MTHFR基因第7外显子区rs1801131位点的单核苷酸多态性可能与中国南方人群结肠癌的遗传易感性相关,而与直肠癌无关,特别是在男性人群中rs1801131 CC和CA基因型可能增加个体患结肠癌的风险.     

亚甲基四氢叶酸还原酶基因多态性与结直肠癌易感性的关系

目的：研究亚甲基四氢叶酸还原酶（methylenetetrahydrofolate reductase,MTHFR）基因C677T、A1298C多态性与结直肠癌易感性的关系.方法：在江苏省进行了一个病例-对照研究（结直肠癌患者315例,人群对照371例）,调查研究对象的生活习惯,抽取静脉血,提取白细胞DNA,采用PCR-RFLP检测研究对象的MTHFR C677T、A1298C基因型.结果：1）男女合计的结直肠癌组、结肠癌组和直肠癌组与对照组之间的MTHFR C677T、A1298C基因型分布频度和等位基因频度差异无统计学意义,MTHFR C677T、A1298C基因多态与结直肠癌、结肠癌和直肠癌的易感性无显著相关.2）在男性中,结肠癌组MTHFR C677T T/T基因型的频度为24.6%,明显高于对照组的14.8%,但差异无统计学意义,X2=3.42,P=0.064.与C677T C等位基因携带者相比,T/T基因型者发生结肠癌的危险性显著升高,其性别、年龄、居住地区及吸烟、饮酒和饮茶习惯调整后的OR为2.15（95%CI：1.07～4.33）.与同时携带MTHFR C677T C等位基因和A1298C A/A基因型者相比,男性的MTHFR C677T T/T和A1298C A/A基因型携带者发生结肠癌的危险性显著升高,其调整OR为2.64（95%CI：1.20～5.81）,而他们发生直肠癌的危险性则明显降低,（调整OR=0.47,95%CI：0.22～1.03）.结论：MTHFR C677T基因多态可以影响男性结、直肠癌的易感性,MTHFR A1298C多态与C677T多态在对男性结、直肠癌易感性的影响中有协同作用.     

潮汕地区汉族人群MTHFR基因rs1801131多态性与非综合征型唇腭裂的相关性研究

目的：研究5,10-亚甲基四氢叶酸还原酶（MTHFR）基因rs1801131位点多态性与潮汕地区汉族人群非综合征型唇腭裂（NSCL/P）的相关性。方法：收集潮汕地区汉族人群NSCL/P患儿357名、患儿父亲199名、患儿母亲198名及健康对照者354名的外周血,提取基因组DNA,应用基质辅助激光解吸电离飞行时间质谱技术检测MTHFR基因rs1801131位点的基因多态性。采用卡方检验对病例组与正常对照组基因型、等位基因频率进行比较分析。在核心家庭中进行等位基因的传递不平衡检验。家系分析由FBAT2.0.2软件完成。结果：病例组及正常对照组MTHFR基因rs1801131位点基因型频率分布均符合Hardy-Weinberg平衡。病例-对照研究发现rs1801131位点基因型多态性和等位基因多态性与NSCL/P的发病风险无显著相关关系（P > 0.05）,核心家庭等位基因A或C均不存在传递不平衡（P > 0.05）,家系分析显示该人群NSCL/P的发病与rs1801131位点等位基因的分布频率无显著相关关系（P > 0.05）。结论：MTHFR基因rs1801131位点多态性与潮汕地区汉族人群NSCL/P发病无显著相关。     

应用质谱技术检测结肠癌细胞DPYD和MTHFR基因单核苷酸多态性

目的:检测结肠癌细胞株中两种代谢相关基因DPYD和MTHFR的单核苷酸多态性(single nucleotide polymorphisms,SNPs)。方法:培养HT-29及Lovo两株结肠癌细胞,分别提取基因组DNA,PCR扩增DPYD和MTHFR基因相应目的片段,采用基于基质辅助激光解吸电离飞行时间质谱技术进行DPYD基因rs1801159(A/G)、rs1801160(G/A)、rs17376848(A/G),MTHFR基因rs1801131(A/C)、rs1801133(C/T)、rs2274976(G/A)的SNPs位点检测。结果:两种细胞的DPYD基因3个位点rs1801159、rs1801160及rs17376848基因型均为野生纯合型,即A/A、G/G及A/A型。HT-29细胞MTHFR基因rs1801131和rs1801133、rs2274976位点基因型分别为A/C、C/T杂合子和G/G纯合子,而Lovo细胞此3个位点依次为A/A、T/T纯合子和G/A杂合子。结论:本实验中HT-29及Lovo两种细胞株的DPYD基因所测3个SNP位点基因型均相同,而这两种结肠癌细胞株MTHFR基因所测的各SNP位点基因型均不相同。     

活性氧代谢通路相关基因多态性对放射性肺炎的预测价值分析?

目的探讨活性氧代谢通路相关基因亚甲基四氢叶酸还原酶(MTHFR)rs1801131、rs1801133位点和超氧化物歧化酶2(SOD2)rs4880位点多态性与放射性肺炎的关系。方法通过聚合酶链反应(PCR)-荧光探针方法检测317例接受胸部放射治疗的肺癌患者MTHFR基因rs1801131、rs1801133位点和SOD2基因rs4880位点单核苷酸多态性(SNP)的基因型,采用Logistic回归模型分析基因多态性与≥2级放射性肺炎的相关性。结果317例患者均完成放疗计划。中位随访时间为16.7个月(3.6~43.0个月),其中67例患者发生≥2级放射性肺炎。Logistic回归模型分析结果显示,MTHFR基因rs1801131位点SNP与放射性肺炎的发生密切相关(P<0.05)。结论MTHFR基因rs1801131位点多态性与肺癌患者放射性肺炎的发生风险密切相关。     

亚甲基四氢叶酸还原酶基因多态性与结直肠癌易感性的关系

目的:研究亚甲基四氢叶酸还原酶(methylenetetrahydrofolate reductase,MTHFR)基因C677T、A1298C多态性与结直肠癌易感性的关系。方法:在江苏省进行了一个病例-对照研究(结直肠癌患者315例,人群对照371例),调查研究对象的生活习惯,抽取静脉血,提取白细胞DNA,采用PCR-RFLP检测研究对象的MTHFR C677T、A1298C基因型。结果:1)男女合计的结直肠癌组、结肠癌组和直肠癌组与对照组之间的MTHFR C677T、A1298C基因型分布频度和等位基因频度差异无统计学意义,MTHFR C677T、A1298C基因多态与结直肠癌、结肠癌和直肠癌的易感性无显著相关。2)在男性中,结肠癌组MTHFR C677T T/T基因型的频度为24.6%,明显高于对照组的14.8%,但差异无统计学意义,χ2=3.42,P=0.064。与C677T C等位基因携带者相比,T/T基因型者发生结肠癌的危险性显著升高,其性别、年龄、居住地区及吸烟、饮酒和饮茶习惯调整后的OR为2.15(95%CI:1.07~4.33)。与同时携带MTHFR C677T C等位基因和A1298C A/A基因型者相比,男性的MTHFR C677T T/T和A1298C A/A基因型携带者发生结肠癌的危险性显著升高,其调整OR为2.64(95%CI:1.20~5.81),而他们发生直肠癌的危险性则明显降低,(调整OR=0.47,95%CI:0.22~1.03)。结论:MTHFR C677T基因多态可以影响男性结、直肠癌的易感性,MTHFR A1298C多态与C677T多态在对男性结、直肠癌易感性的影响中有协同作用。     

VEGFA基因多态性与晚期非小细胞肺癌含铂方案近期疗效的相关性

摘 要：［目的］ 探讨VEGFA rs699947与rs833069位点的单核苷酸多态性与晚期非小细胞肺癌含铂方案近期疗效的关系。［方法］ 收集经病理确诊、驱动基因阴性且接受含铂方案化疗的晚期非小细胞肺癌患者95例及其临床资料,采集静脉血标本,提取血液基因组DNA,高通量测序鉴定rs699947和rs833069位点的基因型,分析各基因型与近期疗效之间的相关性。［结果］ 95例晚期非小细胞肺癌患者中25例（26.3%）评估为部分缓解,70例（73.7%）为稳定或进展。近期疗效与性别、年龄、吸烟状态、ECOG评分、病理类型、组织分化程度、临床分期、淋巴结转移、远处转移、化疗方案以及rs833069位点的单核苷酸多态性无关（P＞0.05）,与rs699947位点的单核苷酸多态性相关（P=0.044）。携带CC基因型患者的部分缓解率为37%（17/46）,显著性高于携带AA或AC基因型患者的16.3%（8/49）（OR=0.333,95%CI：0.127~0.874;P=0.022）。［结论］ VEGFA rs699947位点的单核苷酸多态性与驱动基因阴性的晚期非小细胞肺癌患者的近期疗效有关,rs699947 CC基因型可能是对含铂方案敏感的分子标志物。     

rs4779584 C/T、rs4444235 T/C单核苷酸多态性与江苏泰州地区结直肠癌的发病风险研究

目的 了解单核苷酸多态性（SNP）与泰州地区人群中结直肠癌发病的关系。方法 收集泰州人民医院的76例结肠癌、84例直肠癌患者外周血样本作为疾病组,另选170例健康体检正常人群外周血样本作为对照组,选取与结直肠癌高度相关的SNP位点（rs4779584和rs4444235）进行检测,分析不同基因型和等位基因分布情况及其与结直肠癌总体和不同部位的患病风险。结果 两组rs4779584 C/T和rs4444235 T/C基因型分布均符合Hardy-Weinberg平衡。疾病组rs4779584 C/T和rs4444235 T/C的基因型和等位基因分布与对照组相比,差异均有统计学意义（P<0.05）。rs4779584 C/T中,以CC基因型为参照,CT和TT基因型与结直肠癌的患病风险无关联;以CC+CT基因型为参照,TT基因型的结直肠癌患病风险升高,以C等位基因为参照,T等位基因的结直肠癌患病风险升高,差异均有统计学意义（P<0.05）。rs4444235 T/C中,以TT、TT+TC基因型为参照,CC基因型的结直肠癌患病风险均升高;以T等位基因为参照,C等位基因的结直肠癌的患病风险升高,差异均有统计学意义（P<0.05）。结论 在江苏泰州地区人群中,rs4779584和rs4444235 位点SNP与结直肠肿瘤发病风险高度相关。     

B7-H1基因rs4143815位点多态性与结直肠癌发病风险的关联研究

目的：B7-H1是肿瘤免疫治疗的一个靶点,位于其3'-非翻译区的rs4143815位点C/G多态性可影响其与miR-570的结合,进而影响B7-H1的表达。本研究旨在探讨B7-H1基因rs4143815位点多态性与结直肠癌发病风险的相关性。方法：采集215例结直肠癌患者和236例年龄性别匹配的健康对照人群外周静脉血,并收集手术切除结直肠癌和癌旁正常组织样本65例,直接测序法检测B7-H1基因rs4143815多态性,运用卡方检验分析B7-H1基因rs4143815多态性与结直肠癌发病风险的相关性;定量PCR检测B7-H1 mRNA表达。结果：结直肠癌和对照组中均检测到B7-H1基因rs4143815多态性的3种基因型,即CC、CG和GG基因型。结直肠癌和癌旁正常组织中均检测到B7-H1 mRNA的表达。与CC基因型相比,GG和CG/GG基因型显著增加了结直肠癌的发病风险[GG与CC相比：OR_调整=1.99,95% CI （1.19,3.34）,P=0.008;CG/GG与CC相比：OR_调整=1.58,95% CI （1.06,2.36） P=0.02]。与C等位基因相比,G等位基因显著增加了结直肠癌的发病风险[OR_调整=1.48,95% CI （1.14,1.93）,P=0.004]。B7-H1 mRNA在结直肠癌组织中的表达明显高于癌旁组织（P=0.02）,并且B7-H1基因rs4143815位点GG基因型携带者B7-H1 mRNA水平明显高于CC基因型携带者（P=0.03）。结论：B7-H1基因rs4143815位点GG基因型可能通过增加B7-H1 mRNA表达,进而增加了结直肠癌的发病风险。     

FGFR1基因单核苷酸多态性与中国北方汉族女性乳腺癌发病风险及临床病理特征的关系

目的:探究成纤维生长因子受体1（fibroblast growth factor receptor-1,FGFR1)基因单核苷酸多态性与中国北方汉族女性乳腺癌发病风险和临床病理特征的相关性。方法:采用多重单碱基延伸单核苷酸多态性分型技术检测747例乳腺癌患者和716例健康女性人群FGFR1基因rs13317和rs3213849多态位点基因型,并比较不同基因型与乳腺癌发病风险和临床病理特征的关系。结果:FGFR1基因rs13317和rs3213849多态位点基因型频率在乳腺癌组和对照组中的分布无统计学差异(P＞0.05)。与TT基因型携带者相比,rs13317位点的CT基因型、CC基因型和CT+CC基因型携带者与乳腺癌发病风险无关(P=0.464、P=0.136、P=0.103)。与GG基因型携带者相比,rs3213849位点的GA基因型、AA基因型和GA+AA基因型携带者与乳腺癌发病风险无关(P=0.642、P=0.222、P=0.416)。临床病理分析结果显示,rs13317位点多态性与乳腺癌患者的临床分期、肿瘤大小、组织学分级、淋巴结转移、ER、PR、HER2、Ki67及p53无关(P＞0.05)。在共显性模型下,rs3213849位点在Ki67分布上可能存在差异(P=0.055);在显性模型下,rs3213849位点与Ki67表达情况具有相关性(P=0.023),与其他临床病理因素之间均不相关(P＞0.05)。结论:在目前的样本条件下,FGFR1基因rs3213849位点与Ki67表达可能相关,而rs13317和rs3213849多态性与中国北方汉族女性乳腺癌易感性及其他临床病理特征之间无明显相关性。     

Quantitative assessment of the association between MTHFR rs1801131 polymorphism and risk of liver cancer

Methylenetetrahydrofolate reductase (MTHFR) is one of the most important enzymes for folate metabolism which plays a key role in cell metabolism. MTHFR rs1801131 (A1298C) polymorphism can decrease in vitro MTHFR enzyme activity and has been hypothesized to be associated with liver cancer risk. This study aimed to quantify the strength of the association between MTHFR rs1801131 polymorphism and liver cancer risk by performing a meta-analysis. We searched the PubMed and Wanfang databases for studies relating on the association between MTHFR rs1801131 polymorphism and risk of liver cancer. Seven studies with 2,030 cases of liver cancer and 3,096 controls were finally included into the meta-analysis. Meta-analysis of a total of seven studies showed that the homozygote genotype CC of MTHFR rs1801131 polymorphism was significantly associated with decreased risk of liver cancer (for CC versus AA: odds ratio (OR)?=?0.65, 95 % confidence interval (CI) 0.47–0.89, P?=?0.007; for CC versus AA?+?AC: OR?=?0.65, 95 % CI 0.48–0.89, P?=?0.006). Subgroup by race showed that the homozygote genotype CC of MTHFR rs1801131 polymorphism was significantly associated with decreased risk of liver cancer in Asians (CC versus AA: OR?=?0.64, 95 % CI 0.46–0.90, P?=?0.010; for CC versus AA?+ AC: OR?=?0.63, 95 % CI 0.45–0.88, P?=?0.007). However, the association in Caucasians was still unclear owing to the limited data available now. Thus, Asian individuals with the homozygote genotype CC of MTHFR rs1801131 polymorphism are significantly associated with decreased risk of liver cancer. The association in Caucasians needs further studies.     

Allele and Genotype Frequencies of the Polymorphic Methylenetetrahydrofolate Reductase and Colorectal Cancer among Jordanian Population

Background: Methylenetetrahydrofolate reductase (MTHFR) is involved in DNA synthesis and repair. We hereaimed to investigate two common polymorphisms, C677T and A1298C, with genotype and haplotype frequenciesin colorectal cancer (CRC) cases among Jordanian. Materials and Methods: 131 CRC cases were studied forMTHFR C677T and A1298C polymorphisms, compared to 117 controls taken from the general population,employing the PCR-RFLP technique. Results: We found the frequency of the three different genotypes of MTHFRC677T among Jordanians to be CC: 61.7%, CT: 35.2%, and TT 3.1% among CRC cases and 50.9%, 38.8% and10.3% among controls. Carriers of the TT genotype were less likely to have CRC (OR=0.25; 95%CI: 0.076-0.811;p=0.021) as compared to those with the CC genotype. Genotype analysis of MTHFR A12987C revealed AA:38.9%, AC: 45%, and CC 16% among CRC cases and 37.4%, 50.4% and 12.2% among controls. There wasno significant association between genetic polymorphism at this site and CRC. Haplotype analysis of MTHFRpolymorphism at the two loci showed differential distribution of the TA haplotype (677T-1298A) between casesand controls. The TA haplotype was associated with a decreased risk for colorectal cancer (OR=0.6; 95% CI:0.4-0.9, p=0.03). Conclusions: The genetic polymorphism of MTHFR at 677 and the TA haplotype may modulatethe risk for CRC development among the Jordanian population. Our findings may reflect an importance of genesinvolved in folate metabolism in cancer risk.     

晚期大肠癌ERCC5基因启动子-763A〉G多态性与铂类药物疗效相关性的研究

目的：探讨ERCC5基因启动子区单核苷酸多态性与中国汉族晚期大肠癌奥沙利铂疗效的相关性。方法：收集以奥沙利铂为主化疗的105例晚期大肠癌患者化疗开始前静脉血,提取基因组DNA,应用PCR-LDR方法检测ERCC5基因3个SNP位点-1415C〉T（rs2094258）-7、63A〉G（rs2016073）及-413C〉T（rs943245）多态性,分析不同基因型与疾病控制率、无进展生存期（PFS）的相关性。结果：携带ERCC5-763GG-、763AG和-763AA基因型的患者化疗疾病控制率分别为86.7%、69.2%和52.6%,其中携带-763GG基因型的患者疾病控制率显著高于携带-763AA基因型的患者,P=0.028。携带-763AA基因型的患者中位PFS（36/95例,6个月）低于携带-763AG基因型（48/95例,8个月）及携带-763GG基因型（11/95例,10个月）的患者,差异有统计学意义,χ^2=9.205,P=0.002。-1415C〉T多态性与化疗疾病控制率和PFS之间均无显著相关性。-413C〉T位点未发现遗传多态。结论：ERCC5启动子区-763A〉G单核苷酸多态性与晚期大肠癌奥沙利铂临床疗效相关。     

DICER基因多态性与食管癌遗传易感性研究

目的：研究中国汉族人DICER基因rs3742330A〉G多态性与食管癌易感性的关系。方法：本研究以病例一对照研究为基础,收集2008—10—01—20091130镇江第一人民医院和江苏大学附属人民医院380例食管癌患者和380例非肿瘤患者,采用质谱（MALDI—TOFMS）技术对DICER基因多态性位点rs3742330A〉G进行分型,计算不同基因型与食管癌的发生风险及95％CI。结果：DICER多态性位点rs3742330A〉G基因型AA、AG和GG在食管癌组频率分别为33．9％、51．6％和14．5％,在非肿瘤对照组的频率分别为38．1％、48．4％和13．5％。Logistic回归分析结果表明,相对于AA基因型的个体,AG基因型与食管癌的发病风险无明显相关,OR=1．19,95％CI=0．87～1．62;与AA＋AG基因型相比较,GG基因型与食管癌的发病风险无明显相关,OR=1．09,95％CI=0．72～1．65。结论：DICER基因rs3742330A〉G多态性可能不是食管癌发生的危险因素。     

shRNA靶向沉默ST8SIA4基因表达对乳腺癌细胞侵袭和迁移的影响

目的 探讨短发夹RNA（shRNA）靶向沉默α2, 8-唾液酸转移酶4（ST8SIA4）表达对乳腺癌BT549细胞侵袭、迁移的影响。方法 采用实时荧光定量PCR（QPCR）和Western blotting检测乳腺癌BT549细胞和乳腺正常上皮MCF-10A细胞中ST8SIA4 mRNA和蛋白水平。采用LipofectamineTM2000向BT549细胞随机转染成功构建的靶向沉默ST8SIA4表达的shRNA载体片段（沉默组）或无义shRNA片段（对照组）,转染48 h后采用QPCR检测ST8SIA4 mRNA水平,Western blotting检测ST8SIA4、磷酸化丝／苏氨酸蛋白激酶（p-Akt）、神经纤毛蛋白2（NRP2）和肿瘤坏死因子-α（TNF-α）的表达情况,Transwell实验和划痕实验分别检测细胞的侵袭和迁移能力。结果 与MCF-10A细胞相比,BT549细胞的ST8SIA4 mRNA和蛋白水平均升高（P＜0.05）。转染48 h后,沉默组的ST8SIA4 mRNA和蛋白水平分别为0.19±0.02和0.13±0.02,均低于对照组的0.98±0.11和0.52±0.05（P＜0.05）;沉默组的侵袭细胞数、迁移率及p-Akt、NRP2和TNF-α蛋白相对表达量分别为（39.5±4.2）个、（16.9±1.3）％、0.22±0.03、0.31±0.04和0.27±0.06,均低于对照组的（91.3±8.5）个、（38.4±3.9）％、0.58±0.07、0.55±0.05和0.46±0.05,差异有统计学意义（P＜0.05）。结论 ST8SIA4基因在乳腺癌BT549细胞中高表达,沉默其表达可抑制侵袭和迁移过程,可能与上调p-Akt、NRP2和TNF-α蛋白表达有关。     

DNA修复基因RAD52 miRNA靶序列单核苷酸多态性与肝细胞癌遗传易感性研究

目的 探讨DNA修复基因RAD52 3'非翻译区（3'- untranslated region,3'-UTR）miRNA靶序列单核苷酸多态性（single nucleotide polymorphism,SNP）与广西地区人群肝细胞癌（hepatocellular carcinoma,HCC）遗传易感性的关系。方法 采用病例- 对照研究,对1 002例确诊的HCC新发病例和1 013例非肿瘤患者RAD52基因3'-UTR区域miRNA靶序列SNPs （rs1051669、rs1051672、rs7301931和rs7310449）进行基因分型,并分析其基因型频率分布及其与HCC遗传易感性的关系。结果 RAD52基因各SNP基因型在病例组和对照组中的分布频率差异均无统计学意义（P>0.05）。调整年龄、性别、吸烟、饮酒和HBV感染等因素后,未发现各SNP与HCC易感性有关联;分层分析发现,在女性人群中,与携带rs1051669 C等位基因相比,TT基因型可显著降低个体罹患HCC的风险（TT vs CT/CC：OR=0.03,95%CI：0.00~0.62,P=0.03）;与携带rs1051672 G等位基因相比,AA基因型可显著降低个体罹患HCC的风险（AA vs GA/GG：OR=0.03,95%CI：0.01~0.88,P=0.04）。结论 RAD52基因3'- UTR区域miRNA靶序列SNPs rs1051669、rs1051672位点可能与广西地区女性人群HCC易感性有关。     

Genetic polymorphisms of methylenetetrahydrofolate reductase and susceptibility to colorectal cancer

Objectives: To study the relation between genetic polymorphisms of methylenetetrahydrofolate reductase (MTHFR) C677T or A1298C and the susceptibility of colorectal cancer. Methods: We conducted a case-control study with 315 cases of colorectal cancer and 371 population-based controls in Jiangsu province, China. The epidemiological data were collected, and DNA of peripheral blood leukocytes was obtained from all of the subjects. MTHFR C677T and A1298C genotypes were detected by the PCR-RFLP method. Results: (1) When men and women were assessed together, the frequencies of the MTHFR C677T and A1298 genotypes or their alleles were not significantly different between controls and colon cancer or rectal cancer cases. No significant relation was observed between MTHFR C677T or A1298C polymorphisms and colon or rectal cancer susceptibility. (2) Among males, individuals who had MTHFR C677T T/T genotype were at a significantly higher risk of developing colon cancer (age-, residence-, smoking-, alcohol drinking-, tea consumption-adjusted OR=2.15, 95%CI: 1.07-4.33) compared with those who had C677T C allele. Individuals who had C677T T/T and A1298C A/A genotypes were at an increased risk of developing colon cancer (adjusted OR=2.64, 95%CI: 1.20-5.81) compared with those with C677T C allele and A1298C A/A genotypes among males. On the contrary, individuals who had C677T T/T and A1298C A/A genotypes were at an decreased risk of developing rectal cancer (adjusted OR=0.47, 95%CI: 0.22-1.03). Conclusions: These results in the present study suggested that polymorphisms of the MTHFR C677T could influence susceptibility to colon or rectal cancer and that there was a coordinated effect between MTHFR A1298C A/A and C677T T/T genotypes among males.