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Seroreactivity to Helicobacter pylori Antigens as a Risk Indicator of Gastric Cancer

  • Karami, Najmeh (HPGC Group, Medical Biotechnology Department, Biotechnology Research Center) ;
  • Talebkhan, Yeganeh (HPGC Group, Medical Biotechnology Department, Biotechnology Research Center) ;
  • Saberi, Samaneh (HPGC Group, Medical Biotechnology Department, Biotechnology Research Center) ;
  • Esmaeili, Maryam (HPGC Group, Medical Biotechnology Department, Biotechnology Research Center) ;
  • Oghalaie, Akbar (HPGC Group, Medical Biotechnology Department, Biotechnology Research Center) ;
  • Abdirad, Afshin (Cancer Institute, Amiralam Hospital) ;
  • Mostafavi, Ehsan (Epidemiology Department, Pasteur Institute of Iran) ;
  • Hosseini, Mahmoud Eshagh (Gastroenterology Department, Amiralam Hospital) ;
  • Mohagheghi, Mohammad Ali (Cancer Research Center, Tehran University of Medical Sciences) ;
  • Mohammadi, Marjan (HPGC Group, Medical Biotechnology Department, Biotechnology Research Center)
  • Published : 2013.03.30

Abstract

Background: Multiple etiologic factors are suspected to cause gastric cancer, the most important of which is infection with virulent types of Helicobacter pylori. Materials and Methods: We have compared 102 gastric cancer patients with 122 non-ulcer, non-cancer dyspeptic patients. Gastric specimens were evaluated for H. pylori infection by tissue-based detection methods. Patient sera underwent antigen-specific ELISA and western blotting using a Helicoblot 2.1 kit and antibody responses to various H. pylori antigens were assessed. Results: The absolute majority (97-100%) of both groups were H. pylori seropositive. Multivariate regression analysis demonstrated serum antibodies to the low molecular weight 35kDa protein to be protective and reduce the risk of gastric cancer by 60% (OR:0.4; 95%CI:0.1-0.9). Conversely, seroreactivity to the 89kDa (VacA) protein was significantly higher in gastric cancer patients (OR:2.7; 95%CI:1.0-7.1). There was a highly significant association (p<0.001) between seroreactivity to the 116kDa (CagA) and 89kDa (VacA) proteins, and double positive subjects were found at nearly five fold (OR:4.9; 95%CI:1.0-24.4) enhanced risk of gastric cancer as compared to double negative subjects. Conclusions: Seroreactivity to H. pylori low (35kDa) and high (116kDa/89kDa) molecular weight antigens were respectively revealed as protective and risk indicators for gastric cancer.

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