Abstract
A statistical analysis of neuroblastoma in Hokkaido was performed in relation to Chi-ldhood Cancer Registry in this prefecture. The number of this tumor amounted to 113 cases from 1969 through 1980, the third common cancer among 1157 cases of total childhood ma-lignancies including brain tumor (9.8%).
17.7% of neuroblastoma developed at the age of under 1 year, and over 80% of the cases occurred before 6 years of age. Ratio of male to female was 1:1.13. The adrenal gland was the most common site for primary tumor (57.6%), land the left adrenal gland was affected more frequently than the right one (1.6:1).
There were almost no cases coming in or going out of Hokkaido, and judging from the records of the registered hospitals, most patients visited Sapporo at least once. This may possibly be due to the presence of the pediatric oncologist, besides the instrument for radi-ation therapy being available.
