Mitotic index is an independent predictor of recurrence-free survival in meningioma

Adriana Olar, Khalida M. Wani, Erik P. Sulman, Alireza Mansouri, Gelareh Zadeh, Charmaine D. Wilson, Franco Demonte, Gregory N. Fuller, Kenneth D. Aldape

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

While World Health Organization (WHO) grading of meningioma stratifies patients according to recurrence risk overall, there is substantial within-grade heterogeneity with respect to recurrence-free survival (RFS). Most meningiomas are graded according to mitotic counts per unit area on hematoxylin and eosin sections, a method potentially confounded by tumor cellularity, as well as potential limitations of accurate mitotic figure detection on routine histology. To refine mitotic figure assessment, we evaluated 363 meningiomas with phospho-histone H3 (Ser10) and determined the mitotic index (number of mitoses per 1000 tumor cells). The median mitotic indices among WHO grade I (n = 268), grade II (n = 84) and grade III (n = 11) tumors were 1, 4 and 12. Classification and regression tree analysis to categorize cut-offs identified three subgroups defined by mitotic indices of 0-2, 3-4 and ≥5, which on univariate analysis were associated with RFS (P < 0.01). In multivariate analysis, mitotic index subgrouped in this manner was significantly associated with RFS (P < 0.01) after adjustment for Simpson grade, WHO grade and MIB-1 index. Mitotic index was then examined within individual WHO grade, showing that for grade I and grade II meningiomas, mitotic index can add additional information to RFS risk. The results suggest that the use of a robust mitotic marker in meningioma could refine risk stratification.

Original languageEnglish (US)
Pages (from-to)266-275
Number of pages10
JournalBrain Pathology
Volume25
Issue number3
DOIs
StatePublished - May 1 2015

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine
  • Neuroscience(all)
  • Clinical Neurology

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