title: Helicobacter pylori eradication as a preventive tool against gastric cancer.
abstract: Helicobacter pylori (H. pylori), which increases the risk of gastric diseases, including digestive ulcers and gastric cancer, is highly prevalent in Asian countries. There is no doubt that eradication of the bacterium is effective as a treatment of digestive ulcer, but eradication aiming to reduce the gastric cancer risk is still controversial. Observational studies in Japan demonstrated that the eradication decreased the gastric cancer risk among 132 stomach cancer patients undergoing endoscopical resection (65 treated with omeprazol and antibiotics and 67 untreated). In Columbia, 976 participants were randomized into eight groups in a three-treatment factorial design including H. pylori eradication, resulting in significant regression in the H. pylori eradication group. A recent randomized study in China also showed a significant reduction of gastric cancer risk among those without any gastric atrophy, intestinal metaplasia, and dysplasia. Efficacy of eradication may vary in extent among countries with different incidence rates of gastric cancer. Since the lifetime cumulative risk (0 to 84 years old) of gastric cancer in Japan is reported to be 12.7% for males and 4.8% for females (Inoue and Tominaga, 2003), the corresponding values for H. pylori infected Japanese can be estimated at 21.2% in males and 8.0% in females under the assumptions that the relative risk for infected relative to uninfected is 5 and the proportion of those infected is 0.5. Both the fact that not all individuals are infected among those exposed and the knowledge that only a small percentage of individuals infected with the bacterium develop gastric cancer, indicate the importance of gene-environment interactions. Studies on such interactions should provide useful information for anti-H. pylori preventive strategies.
authors.affiliation: Department of Preventive Medicine/Biostatistics and Medical Decision Making, Nagoya University Graduate School of Medicine, Nagoya, Japan. nhamajim@med.nagoya-u.ac.jp
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Hamajima
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Goto
authors.forename: Kazuko
authors.initials: K
authors.lastname: Nishio
authors.forename: Daisuke
authors.initials: D
authors.lastname: Tanaka
authors.forename: Sayo
authors.initials: S
authors.lastname: Kawai
authors.forename: Hisataka
authors.initials: H
authors.lastname: Sakakibara
authors.forename: Takaaki
authors.initials: T
authors.lastname: Kondo
mesh_terms: D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D000897:Anti-Ulcer Agents / Q000627:therapeutic use; D002681:China; D005753:Gastric Mucosa / Q000382:microbiology / Q000473:pathology; D016481:Helicobacter Infections / Q000150:complications* / Q000517:prevention & control*; D016480:Helicobacter pylori / Q000235:genetics / Q000472:pathogenicity*; D006801:Humans; D007564:Japan; D016032:Randomized Controlled Trials as Topic; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000209:etiology / Q000382:microbiology* / Q000517:prevention & control*; D014774:Virulence
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents