title: Clinical significance of SOD2 and GSTP1 gene polymorphisms in Chinese patients with gastric cancer.
abstract: BACKGROUND
  Excessive reactive oxygen species (ROS) accumulation is a common phenomenon in carcinogenesis. However, the rationale behind ROS involvement in gastric cancer is unclear. In this study, the authors investigated the clinical significance of the single nucleotide polymorphisms (SNPs) of 2 ROS metabolic process-related genes: superoxide dismutase 2 (SOD2) and glutathione S-transferase π (GSTP1).
  
  
  METHODS
  In total of 929 patients with gastric cancer who had definitive clinicopathologic and follow-up data were collected. SOD2 reference SNP 4880 (rs4880) and GSTP1 rs1695 genotyping were examined in DNA samples extracted from paraffin-embedded tumor tissue. Association of the 2 SNPs with each clinicopathologic feature was analyzed using the Pearson chi-square test and the independent Student t test. Gastric cancer-specific overall survival was analyzed using Kaplan-Meier curves and log-rank tests. Multivariate Cox regression analyses of these SNPs also were performed.
  
  
  RESULTS
  The SOD2 rs4880 CT + CC genotypes were significantly associated with a high level of lymph node metastasis (P = .023), whereas the GSTP1 rs1695 GA + GG genotypes were significantly associated with larger tumor size (>5 cm long; P = .048). Kaplan-Meier and Cox regression data indicated that the SOD2 rs4880 CT + CC genotypes alone (hazard ratio, 1.299; 95% confidence interval, 1.053-1.603; P = .015) and the GSTP1 rs1695 GA + GG combined genotypes (hazard ratio, 1.496; 95% CI, 1.078-2.074; P = .016) were independent predictors for overall survival.
  
  
  CONCLUSIONS
  The current data, based on a large cohort (n = 929) of Chinese patients with gastric cancer, suggested that the presence of SOD2 rs4880 and GSTP1 rs1695 genotypes may contribute to cancer progression as well as tumor aggressiveness. The components of ROS metabolism pathways may be potential therapeutic targets for this aggressive malignancy.
authors.affiliation: Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Xu
authors.forename: Haixia
authors.initials: H
authors.lastname: Zhu
authors.forename: John M
authors.initials: JM
authors.lastname: Luk
authors.forename: Dongmei
authors.initials: D
authors.lastname: Wu
authors.forename: Dongying
authors.initials: D
authors.lastname: Gu
authors.forename: Weida
authors.initials: W
authors.lastname: Gong
authors.forename: Yongfei
authors.initials: Y
authors.lastname: Tan
authors.forename: Jianwei
authors.initials: J
authors.lastname: Zhou
authors.forename: Jinhai
authors.initials: J
authors.lastname: Tang
authors.forename: Zhengdong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Meilin
authors.initials: M
authors.lastname: Wang
authors.forename: Jinfei
authors.initials: J
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002681:China; D018450:Disease Progression; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D051549:Glutathione S-Transferase pi / Q000235:genetics*; D006801:Humans; D008207:Lymphatic Metastasis / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D017382:Reactive Oxygen Species / Q000378:metabolism; D013274:Stomach Neoplasms / Q000235:genetics* / Q000401:mortality / Q000473:pathology / Q000503:physiopathology; D013482:Superoxide Dismutase / Q000235:genetics*; D015996:Survival Rate; D016896:Treatment Outcome; D000099156:Superoxide Dismutase 2
chemical_list: D051549:Glutathione S-Transferase pi; D017382:Reactive Oxygen Species; D013482:Superoxide Dismutase; D000099156:Superoxide Dismutase 2; C496556:GSTP1 protein, human