title: [Study on genetic polymorphism of human mismatch repair gene hMLH1 and susceptibility of papillary thyroid carcinoma in Chinese Han people].
abstract: OBJECTIVE
  To explore the associations between the single nucleotide polymorphism of human mismatch repair gene hMLH1 and the papillary thyroid carcinoma (PTC) in Chinese Han people.
  
  
  METHODS
  A hospital based 1:1 matched case-control study was carried out. The single nucleotide polymorphism (-93G > A, 1151T > A and 655A > G) for 204 pairs of cases with PTC as well as healthy controls was identified by PCR-RFLP, PCR-ASO and DNA sequencing.
  
  
  RESULTS
  With univariate analysis, we found that compared to 1151TT genotype, the TA genotype could increase the PTC risk marginally, with odds ratio (OR) of 2.15 (95%CI: 0.99 - 4.85); While the mutant genotype TA + AA could increase the PTC risk statistically significant, with OR of 2.15(95%CI: 1.02 - 4.69). With 2 x 4 cross-over study, we found that compared to -93GG and 1151TT genotypes, individuals with both -93GA + AA and 1151TA + AA could increase the PTC risk marginally, with OR of 2.50 (95%CI: 0.96 - 6.67); While, compared to 655AA and 1151TT genotypes, individuals with both 655AA and 1151TA + AA could increase the PTC risk statistically significant, with OR of 2.50 (95%CI: 1.02 - 4.73). Multivariate and conditional logistic regression analysis showed the genotype of 1151TA, the history of receiving CT diagnosis, the history of tumor, the negative life events and eating seafood frequently could increase the risk of PTC, with OR of 6.79 (95%CI: 3.18 - 14.49), 3.35 (95%CI: 1.93 - 5.80), 39.03 (95%CI: 3.70 - 41.60) and 3.98 (95%CI: 1.81 - 8.73); While, eating fruit frequently could decrease the PTC risk.
  
  
  CONCLUSIONS
  The 1151TA + AA genotype, the history of receiving CT diagnosis, the history of tumor, the negative life events and eating seafood frequently were the risk factors of PTC, while eating fruit frequently was the protective factor.
authors.affiliation: Minhang Center for Disease Control and Prevention, Shanghai, Department of Epidemiology, School of Public Health, Fudan University, Shanghai 201100, China.
authors.forename: Wen-ping
authors.initials: WP
authors.lastname: Shi
authors.forename: Jian-chao
authors.initials: JC
authors.lastname: Bian
authors.forename: Feng
authors.initials: F
authors.lastname: Jiang
authors.forename: Hong-xia
authors.initials: HX
authors.lastname: Ni
authors.forename: Qian-xi
authors.initials: QX
authors.lastname: Zhu
authors.forename: Hong-wei
authors.initials: HW
authors.lastname: Tang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Shen
authors.forename: Yi
authors.initials: Y
authors.lastname: Wu
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics*; D000328:Adult; D044466:Asian People / Q000235:genetics; D002291:Carcinoma, Papillary / Q000453:epidemiology / Q000208:ethnology / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D016555:Matched-Pair Analysis; D008875:Middle Aged; D000070957:MutL Protein Homolog 1; D009687:Nuclear Proteins / Q000235:genetics*; D011110:Polymorphism, Genetic; D013964:Thyroid Neoplasms / Q000453:epidemiology / Q000208:ethnology / Q000235:genetics*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C501486:MLH1 protein, human; D009687:Nuclear Proteins; D000070957:MutL Protein Homolog 1