Incidence of Gastric Cancer in Atomic Bomb Survivors Residing in the Hiroshima Area

Review of the prevalence rate of gastric cancer in A-bomb survivors who had undergone X-ray examination of the stomach during the period November 1972 to March 1982 was made based on estimated A-bomb exposure dose using the 7,188 cases on whom dose information was available. The results obtained are as follows.

1) The gastric cancer prevalence rate for the 0 rad group was 0.75% for males and 0.31% for females or 0.45% for both sexes combined, which increased with dose. The rate for the 100 rad and over group was significantly high being 3.15%, 1.22% and 1.89% respectively.

2) The relative risk of the prevalence rates for the 100 rad and over group were significantly, higher than those of the 0 rad group being 4.29 for males, 4.02 for females and 4.28 for both sexes combined.

3) The prevalence rate of males who were 20 to 34 years of age at time of exposure demonstrated a higher rate than those 35 and over in the 10 rad and over group, but the difference was largest in the≧100 rad group.

Thus, as pointed out in reports based on analyses of death certificates and autopsy studies it is obvious that the prevalence rate is significantly higher in the 100 rad and over exposure group.