Neoplasms Among A-Bomb Survivors in Hiroshima: First Report of the Research Committee on Tumor Statistics, Hiroshima City Medical Association, Hiroshima, Japan23

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Abstract
The 1957–58 incidence of neoplasms among the survivors of the Hiroshima A-bomb varies directly with radiation dose, insofar as it may be inferred from distance from the hypocenter at exposure. The incidence of all malignant neoplasms among the survivors who were within 1000 meters is more than 4 times that of the nonexposed population. The incidence of benign neoplasms among the survivors exposed within 1500 meters is also significantly higher than that among the nonexposed. For survivors under 1500 meters there are significant differences between the number of observed cancers of the lung, stomach, uterus, and ovary and the expected cases calculated from the age-specific rates of the nonexposed portion of the Hiroshima population. The increased incidence among survivors within 1500 meters is not related to sex or age.