Gastric cancer screening and subsequent risk of gastric cancer: a large-scale population-based cohort study, with a 13-year follow-up in Japan.
We prospectively investigated the association between gastric cancer screening and subsequent risk of gastric cancer in a large-scale population-based prospective cohort study, with a 13-year follow-up in Japan. Data were analyzed from a population-based cohort of 42,150 (20,326 men and 21,824 women) subjects. Approximately 36% of subjects reported that they had undergone screening photofluorography during the preceding 12 months, and were regarded as the screened group. A total of 179 gastric cancer deaths and 636 incident gastric cancers were identified during the follow-up period. We observed a 2-fold decrease in gastric cancer mortality in screened versus unscreened subjects (RR = 0.52; 95% CI = 0.36-0.74). The extent of the reduction in mortality for gastric cancer was greater than in death from all causes excluding gastric cancer (RR = 0.71; 95% CI = 0.65-0.78). A significant decrease in the incidence of advanced gastric cancer was observed in screened subjects (RR = 0.75; 95% CI = 0.58-0.96), although the overall incidence rate did not differ significantly between the screened and unscreened subjects (RR = 1.06; 95% CI = 0.90-1.25). In age-stratified analyses, a significant reduction in gastric cancer mortality was seen in screened subjects aged 40-49 years at baseline, compared with a lesser reduction in screened subjects aged 50-59 (RR = 0.30, 95% CI = 0.13-0.72; and RR = 0.60, 95% CI = 0.40-0.88, respectively). These findings suggest that gastric cancer screening may be associated with a reduced risk of mortality from gastric cancer.
Lee
Kyung-Jae
KJ
Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan.
Inoue
Manami
M
Otani
Tetsuya
T
Iwasaki
Motoki
M
Sasazuki
Shizuka
S
Tsugane
Shoichiro
S
D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D010779:Photofluorography; D011446:Prospective Studies; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000401:mortality* / Q000473:pathology