Abstract
Helicobacter pylori infection is associated with histological gastritis, gastric atrophy, gastric cancer and mucosa-associated lymphoid tissue lymphoma in the stomach. However, gastric cancer only develops in a minority of infected individuals. Such clinical diversity is caused by variations in the interactions between H. pylori pathogenicity, host susceptibility, and environmental factors. Based on evidence from three prospective epidemiological studies, the International Agency for Research on Cancer and the World Health Organization (IARC/WHO) concluded in 1994 that H. pylori has a causal linkage to gastric carcinogenesis and is a definite carcinogen in humans. Two large-scale, prospective, epidemiological studies have recently been reported in Japan and have confirmed that H. pylori infection constitutes a high risk factor for the development of gastric cancer, at least in males. In order to obtain evidence that eradication of H. pylori leads to a reduction in the occurrence of gastric cancer, reversibility of precancerous lesions, gastric atrophy or intestinal metaplasia should be proven after eradication treatment. A biopsy specimen from the lesser curvature of the corpus is the most sensitive for evaluating the regression of gastric atrophy on histology, and the evaluation needs be conducted at least 13 months after treatment. In a Mongolian gerbil model with or without low-dose chemical carcinogens, it has been demonstrated that H. pylori can lead to the development of gastric cancer. Experimental studies have elucidated that virulence factors of H. pylori interact with gastric epithelial cell signaling related to carcinogenesis. The cag pathogenicity island (cagPAI) is a major virulence gene cluster; it encodes the type IV secretion machinery system forming a cylinder-like structure. The CagA protein is translocated into target cells via this secretion system and induces a hummingbird phenotype, a growth factor-like effect. The other gene products are probably translocated into target cells and accelerate cellular proliferation and apoptosis. The molecular mechanism of the interaction between H. pylori and gastric epithelial cells may provide a new strategy for effective prevention of the development of gastric cancer induced by H. pylori infection.
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This work was presented at the 19th Bristol-Myers Squibb Nagoya International Cancer Treatment Symposium, “State of the Arts for Digestive Organs”, 14–15 November 2003, Nagoya, Japan.
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Sugiyama, T. Development of gastric cancer associated with Helicobacter pylori infection. Cancer Chemother Pharmacol 54 (Suppl 1), S12–S20 (2004). https://doi.org/10.1007/s00280-004-0881-3
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DOI: https://doi.org/10.1007/s00280-004-0881-3