title: Dynamic expression of pepsinogen C in gastric cancer, precancerous lesions and Helicobacter pylori associated gastric diseases.
abstract: OBJECTIVE
  To investigate the relationship between the expression of pepsinogen C (PGC) and gastric cancer, precancerous diseases, and Helicobacter pylori (H pylori) infection.
  
  
  METHODS
  The expression of PGC was determined by immunohistochemistry method in 430 cases of gastric mucosa. H pylori infection was determined by HE staining, PCR and ELISA in 318 specimens.
  
  
  RESULTS
  The positive rate of PGC expression in 54 cases of normal gastric mucosa was 100%. The positive rates of PGC expression in superficial gastritis or gastric ulcer or erosion, atrophic gastritis or gastric dysplasia and gastric cancer decreased significantly in sequence (P<0.05; 100%/89.2% vs 14.3%/15.2% vs 2.4%). The over-expression rate of PGC in group of superficial gastritis with H pylori infection was higher than that in group without H pylori infection (P<0.05; chi2= 0.032 28/33 vs 15/25). The positive rate of PGC expression in group of atrophic gastritis with H pylori infection was lower than that in group without H pylori infection (P<0.01; chi2= 0.003 4/61 vs 9/30), and in dysplasia and gastric cancer.
  
  
  CONCLUSIONS
  The level of PGC expression has a close relationship with the degree of malignancy of gastric mucosa and development of gastric lesions. There is a relationship between H pylori infection and expression of antigen PGC in gastric mucosa, the positive rate of PGC expression increases in early stage of gastric lesions with H pylori infection such as gastric inflammation and decreases during the late stage such as precancerous diseases and gastric cancer. PGC-negative cases with H pylori-positive gastric lesions should be given special attention.
authors.affiliation: Cancer Institute of the First Affiliated Hospital of China Medical University, Shenyang 110001, Liaoning Province, China.
authors.forename: Pei-Fang
authors.initials: PF
authors.lastname: Ning
authors.forename: Hui-Jie
authors.initials: HJ
authors.lastname: Liu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yuan
mesh_terms: D014408:Biomarkers, Tumor / Q000378:metabolism; D005756:Gastritis / Q000378:metabolism / Q000473:pathology; D016481:Helicobacter Infections / Q000378:metabolism* / Q000473:pathology; D016480:Helicobacter pylori; D006801:Humans; D020115:Pepsinogen C / Q000378:metabolism*; D011230:Precancerous Conditions / Q000378:metabolism* / Q000473:pathology; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology
chemical_list: D014408:Biomarkers, Tumor; D020115:Pepsinogen C