Statistical Table 9

 

Two- and Five-Year Observed and Relative Survival Ratesa for
Malignant Brain Tumors by Age Groups,
SEER 1973-1994

HISTOLOGY
No. of Cases Survival Time
(Years)

Age at Diagnosis
<21 21-44 45-64 65+

Glioblastoma
10,354 Two 29.3 30.7 7.6 2.1
Five 20.1 13.2 2.0 b

Astrocytoma, NOS
6,268 Two 80.6 74.8 27.4 7.7
Five 75.0 52.3 16.1 4.4

Pilocytic astrocytoma
518 Two 94.3 87.1 81.9 b
Five 89.5 86.3 68.7 b

Diffuse astrocytoma
522 Two 84.8 83.7 40.7 14.8
Five 79.2 56.3 26.2 b

Anaplastic astrocytoma
1,473 Two 63.8 71.8 30.5 6.8
Five 52.8 47.4 15.5 b

Oligodendroglioma
955 Two 83.8 88.0 69.1 45.0
Five 78.4 76.0 46.7 24.2

Ependymoma/
anaplastic ependymoma
755 Two 65.6 88.2 79.6 67.6
Five 47.0 82.0 64.1 69.7

Glioma, malignant, NOS
1,903 Two 47.8 65.4 29.7 8.8
Five 41.2 50.3 20.4 4.5

Mixed glioma
483 Two 77.4 84.8 59.5 42.8
Five 69.9 68.7 35.7 19.6

Embryonal/ primitive/medulloblastoma
921 Two 67.7 73.2 67.8 b
Five 50.7 53.8 48.4 b

Neuroepithelial
214 Two 76.6 66.9 30.0 b
Five 64.3 52.6 22.0 b

Malignant neuronal/glial, neuronal and mixed

127 Two 64.6 67.6 b b
Five 47.7 57.7 b b
a Rates are an estimate of the percentage of patients alive at two and five years, respectively.
b Too few cases to estimate.
Abbreviations used: SEER, Surveillance, Epidemiology, and End Results; NOS, not otherwise specified.

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