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In order to compare the type distribution of myeloid leukemia worldwide, we abstracted the incidence in 2003–2007 from Cancer Incidence in Five Continents Vol. X (CI5-X). The International Agency for Research on Cancer provides the CI5 detailed databases on the incidence of cancer recorded by cancer registries (regional and national) worldwide. We used the number of incidences in Japan, the Republic of Korea, the USA, Brazil, the UK, Italy and Australia from the CI5 database which contains the incidence for selected cancer registries published in CI5-X for 2003–2007. The Republic of Korea and the USA (NPCR: National Program of Cancer Registries) reported the cancer incidence covered by all the country; however, the remaining countries reported the cancer incidence by registry. We aggregated eight registries in Japan, two registries in Brazil, four registries in the UK, 21 registries in Italy, and five registries in Australia. We compared the type distribution between countries for myeloid leukemia coded as C92–C94 (ICD10).
In the UK, Italy, Australia and the USA, the proportion of lymphoid leukemia was approximately 50% for males. The proportion of lymphoid leukemia was higher than that of myeloid leukemia in these countries. Conversely, in Japan and Korea, the proportion of myeloid leukemia was over 60% for males. The proportion of myeloid leukemia was higher than that of lymphoid leukemia in these two countries.
Age-standardized rates for males with myeloid leukemia, using World Standard Population, ranged from 3.1 to 5.1 per 100 000, and the rates for females ranged from 2.2 to 3.4 per 100 000 in the countries studied. The incidence of myeloid leukemia in males was slightly higher than that in females. There was not much difference in the incidence between the countries studied.
Figure 1 shows the type distribution for myeloid leukemia for males; Fig. 2 shows these data for females. There was not much difference in the type distribution for myeloid leukemia between the sexes and there is little difference in the distribution between the countries studied. There was a higher proportion of acute leukemia than chronic leukemia. The proportion of acute myeloid leukemia was approximately 70% in Japan and the UK, 60% in the Republic of Korea, the USA, Brazil and Italy, and 50% in Australia. Chronic myeloid leukemia is one of the major types of myeloid leukemia. However, the frequency of occurrence of acute myeloid leukemia was almost three times as high as that of chronic myeloid leukemia. The proportion of unspecified myeloid leukemia was under 5% in almost all of the studied countries except Brazil.
Note: Data were downloaded from IARC CANCER Mondial Statistical Information System (http://www-dep.iarc.fr/). Responsibility for this presentation and interpretation lies with the authors of this article.