title: Incidences of gliomas and meningiomas in Denmark, 1943 to 1997.
abstract: OBJECTIVE
  The objective of this study was to determine the nationwide, population-based incidences of intracranial gliomas and meningiomas (of all grades) during 55 years of monitoring in Denmark.
  
  
  METHODS
  On the basis of reports in the Danish Cancer Registry, we calculated age-standardized, period-specific incidences and age- and birth cohort-specific incidences, in 5-year age and calendar intervals, for intracranial gliomas and meningiomas.
  
  
  RESULTS
  The incidence of gliomas increased 1.7-fold from 1943 to 1947 to 1993 to 1997, whereas the incidence for meningiomas increased 3.9-fold during the same period.
  
  
  CONCLUSIONS
  Based on complete notification to the Danish Cancer Registry, the overall incidences of intracranial gliomas and meningiomas increased during a 55-year period. These increases were observed for all age groups and both sexes. These increases could be explained on the basis of improved diagnoses of these tumors. For gliomas, a maximal annual incidence of approximately 4 cases/100,000 population (World Standard Population) was observed in Denmark at the end of the study period, suggesting that the effects of improved diagnostic tools have reached their maximum with respect to this tumor type. The same was not observed for the incidence of meningiomas, suggesting that perhaps underreporting is still present.
authors.affiliation: Institute of Cancer Epidemiology, The Danish Cancer Society, Strandboulevarden 49, DK-2100 Copenhagen, Denmark. Collatz@cancer.dk
authors.forename: Helle Collatz
authors.initials: HC
authors.lastname: Christensen
authors.forename: Michael
authors.initials: M
authors.lastname: Kosteljanetz
authors.forename: Christoffer
authors.initials: C
authors.lastname: Johansen
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D001932:Brain Neoplasms / Q000453:epidemiology*; D003718:Denmark / Q000453:epidemiology; D005260:Female; D005910:Glioma / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D008297:Male; D008577:Meningeal Neoplasms / Q000453:epidemiology*; D008579:Meningioma / Q000453:epidemiology*; D008875:Middle Aged; D012042:Registries / Q000706:statistics & numerical data*; D017678:Sex Distribution; D013997:Time Factors