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Six-hundred-one cases af leukemia and allied conditions of Koresns diagnosed by authors at the Seoul National lniversity Hospital during the last 15 years were analysed. The number of leukemia patients are markedly inereased from 51 cases in 1957 1959 to 176 cases in 1969~ 1971, and it wss mainly due to an increase of the acute form leukemia in childhood. The relative frequency of chronic leukemias are rather decrea- sing in recent years. Male to female sex ratio is 1.85: 1 in over-all leukemia cases, however it is 2.26: 1 in the age group of 0-14 years and 1. 40: 1 in the age group of 60 years and over. The sex ratio in ALL, AML and CML is 2.58: 1, 1.63: 1 and 1. 40: 1 respeetively. The age incidence of leukemia is highest at the age group of 0-14 years being 35. 8%(26. 2% in 0-8 year age group), and it decreases gradually with the inerease of age until only 4.0% at the age group of 60 years and over. The type frequencies of leukemia and allied conditions nre AML 88. 1%, ALL 30. 9%, CML 16.0% myelo-monocytic leukemia 5.8%, lymphoma with leukemie manifestation in peripheral blood 3.9%, multiple myeloma 1.7%, erythremic myelosis and erythroleukemia l. 2%, stem cell leukemia 1.0%, and monocytic leukemia 0.8% respectively. The incidence of chronic lymphoid leukemia is very low showing only 0. 5% of the total 601 cases.
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