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Tobacco smoking increases the risk for gastric adenocarcinoma among Helicobacter pylori-infected individuals

Simán, Henrik LU ; Forsgren, Arne LU ; Berglund, Göran LU and Florén, Claes-Henrik LU (2001) In Scandinavian Journal of Gastroenterology 36(2). p.208-213
Abstract
BACKGROUND: The importance of tobacco smoking and Helicobacter pylori infection as risk factors in the development of gastric carcinoma was investigated through multivariate conditional logistic regression analysis in a nested case-control study. METHODS: Blood samples and a questionnaire on smoking habits were collected from a cohort of 32,906 city residents during a health screening programme from 1974 to 1992. Fifty-six cases of gastric cancer and 224 matched controls were selected. The mean interval between screening and cancer diagnosis was 5.7 years. H. pylori infection was determined by IgG-serology. Occupation categorized into blue-collar workers, white-collar workers, self-employed and unknown occupation was included in the... (More)
BACKGROUND: The importance of tobacco smoking and Helicobacter pylori infection as risk factors in the development of gastric carcinoma was investigated through multivariate conditional logistic regression analysis in a nested case-control study. METHODS: Blood samples and a questionnaire on smoking habits were collected from a cohort of 32,906 city residents during a health screening programme from 1974 to 1992. Fifty-six cases of gastric cancer and 224 matched controls were selected. The mean interval between screening and cancer diagnosis was 5.7 years. H. pylori infection was determined by IgG-serology. Occupation categorized into blue-collar workers, white-collar workers, self-employed and unknown occupation was included in the statistical analysis as an indicator of socio-economic status. RESULTS: The proportion of current smokers was 61% among gastric cancer cases, versus 41% among controls. H. pylori seropositivity was present in 82% of the cases and 49% of the controls. In a multivariate model current smokers had an odds ratio (OR) of 2.2 (95% confidence interval (CI): 1.2-4.2). With different levels of tobacco consumption, smoking less than 20 g tobacco each day gave the OR of 2.1 (95% CI: 0.98-4.4), and the OR when smoking more than 20 g tobacco per day was 2.5 (95% CI: 1.1-5.6). The OR of H. pylori infection was 5.0 (95% CI: 2.2-11.2). Among H. pylori-seropositive citizens, current smoking was associated with an increased risk of 2.3 (95% CI: 1.1-4.7) compared with non-smoking H. pylori-positive persons. CONCLUSIONS: Tobacco smoking and H. pylori are both risk factors in the development of gastric cancer, and tobacco smoking is still a risk factor among H. pylori-infected individuals. The risk of gastric cancer among H. pylori-infected current smokers is 11 times that of non-infected individuals not currently smoking. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
nested case-control study, Helicobacter pylori, Gastric cancer, tobacco smoking
in
Scandinavian Journal of Gastroenterology
volume
36
issue
2
pages
208 - 213
publisher
Taylor & Francis
external identifiers
  • pmid:11252415
  • scopus:0035129895
ISSN
1502-7708
language
English
LU publication?
yes
id
b214e8d0-0d79-49ab-a51c-443342afb74a (old id 1123076)
date added to LUP
2008-08-28 09:30:00
date last changed
2018-01-07 08:54:19
@article{b214e8d0-0d79-49ab-a51c-443342afb74a,
  abstract     = {BACKGROUND: The importance of tobacco smoking and Helicobacter pylori infection as risk factors in the development of gastric carcinoma was investigated through multivariate conditional logistic regression analysis in a nested case-control study. METHODS: Blood samples and a questionnaire on smoking habits were collected from a cohort of 32,906 city residents during a health screening programme from 1974 to 1992. Fifty-six cases of gastric cancer and 224 matched controls were selected. The mean interval between screening and cancer diagnosis was 5.7 years. H. pylori infection was determined by IgG-serology. Occupation categorized into blue-collar workers, white-collar workers, self-employed and unknown occupation was included in the statistical analysis as an indicator of socio-economic status. RESULTS: The proportion of current smokers was 61% among gastric cancer cases, versus 41% among controls. H. pylori seropositivity was present in 82% of the cases and 49% of the controls. In a multivariate model current smokers had an odds ratio (OR) of 2.2 (95% confidence interval (CI): 1.2-4.2). With different levels of tobacco consumption, smoking less than 20 g tobacco each day gave the OR of 2.1 (95% CI: 0.98-4.4), and the OR when smoking more than 20 g tobacco per day was 2.5 (95% CI: 1.1-5.6). The OR of H. pylori infection was 5.0 (95% CI: 2.2-11.2). Among H. pylori-seropositive citizens, current smoking was associated with an increased risk of 2.3 (95% CI: 1.1-4.7) compared with non-smoking H. pylori-positive persons. CONCLUSIONS: Tobacco smoking and H. pylori are both risk factors in the development of gastric cancer, and tobacco smoking is still a risk factor among H. pylori-infected individuals. The risk of gastric cancer among H. pylori-infected current smokers is 11 times that of non-infected individuals not currently smoking.},
  author       = {Simán, Henrik and Forsgren, Arne and Berglund, Göran and Florén, Claes-Henrik},
  issn         = {1502-7708},
  keyword      = {nested case-control study,Helicobacter pylori,Gastric cancer,tobacco smoking},
  language     = {eng},
  number       = {2},
  pages        = {208--213},
  publisher    = {Taylor & Francis},
  series       = {Scandinavian Journal of Gastroenterology},
  title        = {Tobacco smoking increases the risk for gastric adenocarcinoma among Helicobacter pylori-infected individuals},
  volume       = {36},
  year         = {2001},
}