In Hiroshima and Nagasaki chronic lymphocytic leukemia is rare in comparison to the United States. No patient with this disorder was identified among the residents of Hiroshima City during a 20 year period of study. The incidence of chronic lymphocytic leukemia in Nagasaki City, however, was similar to that for all Japan. There is no evidence that the development of chronic lymphocytic leukemia in these cities was related to exposure to the atomic detonations of 1945.

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