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. 2017 Dec 5;20(8):1113–1121. doi: 10.1093/neuonc/nox231

Table 2.

Histomolecular characteristics of anaplastic meningiomas

De Novo Anaplastic Meningiomas n = 28 Progressing Anaplastic Meningiomas n = 29
Number of relapses before switch to grade III
 1 12
 2 5
 3 7
 4 2
 5 5
Number of mitoses at diagnosis of grade III histology
 >20 21 29
 15–20 1 0
 5–10 2 0
 <5 4 0
Histological anaplasia
 with elevated number of mitoses 11 20
 without elevated number of mitoses 7 0
TERT promoter mutation 5/28 3/29
TERT promoter methylation 11/14 19/19