Incidence and relative survival of anaplastic astrocytomas.
BACKGROUND
The purpose of this study was to investigate the relationship between age and the incidence and relative survival of anaplastic astrocytoma (AA).


METHODS
Data from the Surveillance, Epidemiology and End Results database were used to identify 3202 patients with AA. These data were analyzed to assess incidence rates, relative survival, and the standardized mortality ratio across age groups. Time trends were modeled using delayed-entry modeling.


RESULTS
The overall incidence of AA was an age-adjusted rate of 3.5 per million person/years. The overall age-standardized 5- and 10-year relative survival rates of populations with AA were 23.6% and 15.1%, respectively. The overall standardized mortality ratio for the entire cohort was 46 (95% confidence interval: 45, 48).


CONCLUSIONS
Patients with a diagnosis of AA are 46 times more likely to die than persons matched for age/sex/year of the general population. The effect of age on survival is present for only the first 2 years postdiagnosis. Measuring the effect of age on survival for populations with an AA is not amenable to using models with proportional hazards as an assumption because of the presence of a reverse fork-type interaction.
Department of Medicine, Peninsula Health, Frankston, Victoria, Australia (N.R.S., B.H.).
Nicolas R
NR
Smoll
Department of Medicine, Peninsula Health, Frankston, Victoria, Australia (N.R.S., B.H.).
Brett
B
Hamilton
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001254:Astrocytoma / Q000453:epidemiology* / Q000401:mortality; D001932:Brain Neoplasms / Q000453:epidemiology* / Q000401:mortality; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D018426:SEER Program; D055815:Young Adult
anaplastic astrocytoma; brain tumor; nonproportional hazards; relative survival; standardized mortality ratio