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In 1975, childhood cancer caused in approximately 2,500 children. After 1980,
patients diagnosed as childhood cancer has been deceased and it was
approximately 2000 children in 2005. However, the population-based morbidity of
childhood cancer remains to approximately 10 per 100,000 children and it has not
been changed since 1975. In Japan, childhood population has been decreased after
1950. The percentage population of children was decreased to 20% in 2005, while
the pupulation rate was approximately 40% in 1950. Thus, the cause of childhood
cancer has been decreased with decreasing the population of children, but the
morbidity is not changed from 1970s.
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