A case-control study of lung cancer screening in Okayama Prefecture, Japan

Kenji Nishii, Hiroshi Ueoka, Katsuyuki Kiura, Tsuyoshi Kodani, Masahiro Tabata, Takuo Shibayama, Kenichi Gemba, Takushi Kitajima, Akio Hiraki, Masashi Kawaraya, Tomio Nakayama, Mine Harada

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


The effectiveness of lung cancer screening in reducing mortality still remains uncertain. In order to evaluate the efficacy of lung cancer screening, a case-control study was conducted in Okayama Prefecture, Japan. The study area consisted of 34 municipalities where a population-based lung cancer screening had been conducted. Chest X-ray examinations for all participants and sputum cytology for high-risk participants were offered annually. The cases analyzed in this study consisted of 412 individuals aged between 40 and 79 who died of lung cancer. A total of 3490 controls, two to ten for each case matched by gender, year of birth, and living district were randomly collected. Screening histories of cases were compared with those of and matched controls for the identical calendar period prio to diagnosis of the case. Smoking adjusted odds ratio (OR) of death from lung cancer for screened individuals versus unscreened, within 12 months before diagnosis, was calculated as 0.59 (95% confidence interval: 0.46-0.74; P=0.0001). The OR for women (0.39, 95% confidence interval: 0.24-0.64) was lower than that for men (0.67, 95% confidence interval: 0.51-0.87), although both were statistically significant. These results suggest that lung cancer screening contributes to reducing lung cancer mortality by 41%.

Original languageEnglish
Pages (from-to)325-332
Number of pages8
JournalLung Cancer
Issue number3
Publication statusPublished - 2001


  • Case-control study
  • Chest X-ray examination
  • Lung cancer mortality
  • Lung cancer screening
  • Odds ratio
  • Sputum cytology

ASJC Scopus subject areas

  • Oncology
  • Pulmonary and Respiratory Medicine
  • Cancer Research


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