title: [Screening and analysis of associated genes in the carcinogenesis and progression of gastric cancer].
abstract: OBJECTIVE
  To screen and analyze the important associated genes in different stages of gastric cancer.
  
  
  METHODS
  Using suppression subtractive hybridization (SSH) to screen differentially expressed genes; detecting the expression of genes in different stages of gastric cancer with dot blot hybridization; and verifying the results with semi-quantitative reverse transcriptase-polymerase chain reaction(RT-PCR).
  
  
  RESULTS
  Twenty-six differentially expressed gene fragments were obtained by means of SSH. Among them,24 were known genes, 1 was a new expressed sequence tags(EST), and 1 was a hypothetical gene. The results of dot blot hybridization demonstrated that the expressions of Annexin A2, RPS29, RPS12 etc. in dysplasia were higher than those in normal mucosa; the expressions of RPS12 etc.in early cancer were higher than those in normal mucosa;the expressions of cytochromosome C oxidase II, ferritin light chain, RPS12 etc. in advanced gastric cancer and lymph node metastases were consistently higher than those in normal mucosa. The expression of proteasome 26S subunit gene in advanced gastric cancer was higher than that in normal mucosa. The expression of RPS12 was consistently higher in different stages of gastric cancer. It was demonstrated by RT-PCR that the expression of RPS12 in gastric cancer was higher than that in normal mucosa.
  
  
  CONCLUSIONS
  The authors have identified some important genes that might be involved in the carcinogenesis and progression of gastric cancer, and RPS12 may play more important roles in gastric cancer.
authors.affiliation: Department of Medical Genetics, China Medical University, Shenyang, Liaoning, 110001 PR China.
authors.forename: Xiu-ju
authors.initials: XJ
authors.lastname: Sun
authors.forename: Dong-mei
authors.initials: DM
authors.lastname: Hao
authors.forename: Zhi-hong
authors.initials: ZH
authors.lastname: Zheng
authors.forename: Hao
authors.initials: H
authors.lastname: Fu
authors.forename: Hui-mian
authors.initials: HM
authors.lastname: Xu
authors.forename: Mei-xian
authors.initials: MX
authors.lastname: Wang
authors.forename: Kai-lai
authors.initials: KL
authors.lastname: Sun
mesh_terms: D020869:Gene Expression Profiling / Q000379:methods; D015972:Gene Expression Regulation, Neoplastic; D005820:Genetic Testing / Q000379:methods*; D006801:Humans; D009693:Nucleic Acid Hybridization / Q000379:methods*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000175:diagnosis / Q000235:genetics*