title: No association between AICDA 7888 C/T polymorphism, Helicobacter pylori seropositivity, and the risk of atrophic gastritis and gastric cancer in Japanese.
abstract: BACKGROUND
  The aberrant expression of activation-induced cytidine deaminase (AICDA) was reportedly induced in gastric epithelial cells infected with cytotoxin-associated gene A (cagA)-positive Helicobacter pylori, resulting in the accumulation of alterations in the TP53 tumor suppressor gene in gastric cells. We investigated the association of the AICDA 7888 C/T polymorphism with H. pylori infection and the risk of gastric cancer and atrophic gastritis in Japanese subjects.
  
  
  METHODS
  The study subjects were 583 histologically diagnosed gastric cancer patients (cases) and 1637 age- and sex-frequency-matched control outpatients, who visited Aichi Cancer Center Hospital from the years 2001 to 2005. In the controls, serum anti-H. pylori IgG antibody and pepsinogens were measured to evaluate H. pylori infection and atrophic gastritis, respectively. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated by a logistic model.
  
  
  RESULTS
  H. pylori seropositivity in the controls was not significantly associated with the AICDA 7888 C/T genotypes. Among the H. pylori seropositive control subjects, the age and sex-adjusted ORs of atrophic gastritis were not statistically significant: 0.84 (95% CI, 0.62-1.13) for C/T, 0.82 (95% CI, 0.56-1.21) for T/T, and 0.83 (95% CI, 0.63-1.11) for C/T+T/T, relative to the C/C genotype. The age- and sex-adjusted ORs of gastric cancer relative to atrophic gastritis were also not statistically significant, at 1.17 (95% CI 0.89-1.54), 1.21 (95% CI, 0.85-1.71), and 1.18 (95% CI, 0.91-1.53), respectively. The OR of gastric cancer cases compared with the whole cohort of control subjects was also not significant.
  
  
  CONCLUSIONS
  The hypothetical association of the AICDA 7888 C/T polymorphism with the risk of gastric cancer or gastric atrophy was not shown in this study.
authors.affiliation: Department of Preventive Medicine/Biostatistics and Medical Decision Making, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Japan.
authors.forename: Asahi
authors.initials: A
authors.lastname: Hishida
authors.forename: Keitaro
authors.initials: K
authors.lastname: Matsuo
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Goto
authors.forename: Yoko
authors.initials: Y
authors.lastname: Mitsuda
authors.forename: Akio
authors.initials: A
authors.lastname: Hiraki
authors.forename: Mariko
authors.initials: M
authors.lastname: Naito
authors.forename: Kenji
authors.initials: K
authors.lastname: Wakai
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tajima
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Hamajima
mesh_terms: D000328:Adult; D000368:Aged; D000907:Antibodies, Bacterial / Q000097:blood; D000942:Antigens, Bacterial / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics; D016001:Confidence Intervals; D003564:Cytidine Deaminase / Q000235:genetics*; D005260:Female; D005757:Gastritis, Atrophic / Q000453:epidemiology / Q000235:genetics*; D005787:Gene Frequency; D016147:Genes, Tumor Suppressor; D005838:Genotype; D016481:Helicobacter Infections / Q000150:complications* / Q000453:epidemiology; D016480:Helicobacter pylori / Q000235:genetics / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007564:Japan / Q000453:epidemiology; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D018570:Risk Assessment; D016036:Seroepidemiologic Studies; D013274:Stomach Neoplasms / Q000453:epidemiology / Q000235:genetics*; D000098830:AICDA (Activation-Induced Cytidine Deaminase)
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D007074:Immunoglobulin G; C080866:cagA protein, Helicobacter pylori; D000098830:AICDA (Activation-Induced Cytidine Deaminase); D003564:Cytidine Deaminase