Epidemiology of adult medulloblastoma

Medulloblastoma is one of the most common primary tumors of the central ner vous system seen in children; in contrast, it is somewhat uncommon in adult age, Due to the infrequent occurrence, data on incidence rates are sparse. The present study was aimed at ascertaining the epidemiological characteri stics of medulloblastoma in adult age in Piedmont during the period 1976-19 95, Piedmont is a region in northwest Italy, which had a total population o f 4.30 millions/rear for the period mentioned. From the files of clinical r ecords of patients hospitalized in neurologic and neurosurgical departments , 45 cases (32 males, 13 females) of histologically verified medulloblastom a were recorded. The incidence rate (annual per million) in the whole perio d studied was 0.5 (95% confidence interval, 0.36-0.67), The incidence rate was high in the age group 15 to 19 years (2.33/million/year) and decreased up to age 40, consistent with the embryonal origin of the tumor. No time-tr end of incidence rate was found. Male excess was evident in all age groups and in each time period. Median survival time was 17.6 years; the 5-year su rvival rate was 69.9%, Survival rate in the present group of adult medullob lastoma is slightly better than that reported in clinical series. A compari son was made with incidence data concerning pediatric medulloblastoma repor ted in the Registry of Childhood Cancer of Piedmont: from 1980 to 1989, adu lt medulloblastomas represented 34% of medulloblastomas, The figure is high er than that generally assumed, and indicates that the occurrence of this e mbryonal tumor in adult age is relevant, Our epidemiological data are consi stent with an embryonal origin of medulloblastoma. Int. J, Cancer 80:689-69 2,1999. (C) 1999 Wiley-Liss, Inc.