Frequency of Lymphoreticular Tumors and Leukemias in Japan2

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Abstract
To determine the frequency of Iymphoreticular tumors and leukemias in Japan, 5 different sources of material were reviewed. The standardized death rates of malignant lymphomas by prefectures showed a northto- south gradient of increasing rates for all 3 types of tumors—lymphosarcoma, reticulosarcoma, and Hodgkin's disease. The relative frequency studies revealed an ex", tremely high frequency of reticulosarcoma compared with lymphosarcoma and Hodgkin's disease, male predominance in the sex ratio, and bimodality in the age distribution for lymphosarcoma. Reticulosarcoma and Hodgkin's disease showed the highest frequency in the seventh decade. The rarity of Burkitt's tumor in Japan was confirmed. Histologic classification of Hodgkin's disease showed that the nodular sclerosis type was less frequent in Japan than in the United States. Comparison of the periods 1958–60 and 1967–69 showed a distinct increase in Hodgkin's disease. Lymphocytic leukemia had a much lower frequency than myelocytic leukemia, and the rarity of chronic lymphocytic leukemia was particularly evident. All types of leukemia were rare after age 45.

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