Extent of resection, MGMT promoter methylation status and tumor location independently predict progression-free survival in adult sporadic pilocytic astrocytoma
In adults, pilocytic astrocytomas (PA) account for less than 2% of gliomas, resulting in uncertainty regarding the clinical course and optimal treatment, particularly in cases where gross total resection (GTR) could not be achieved. Moreover, information on molecular markers and their prognostic imp...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
29 July 2019
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| In: |
Cancers
Year: 2019, Volume: 11, Issue: 8 |
| ISSN: | 2072-6694 |
| DOI: | 10.3390/cancers11081072 |
| Online Access: | Verlag, Volltext: https://doi.org/10.3390/cancers11081072 Verlag: https://www.mdpi.com/2072-6694/11/8/1072 
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| Author Notes: | Christine Jungk, Annekathrin Reinhardt, Rolf Warta, David Capper, Andreas von Deimling, Christel Herold-Mende and Andreas Unterberg |
MARC
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| 245 | 1 | 0 | |a Extent of resection, MGMT promoter methylation status and tumor location independently predict progression-free survival in adult sporadic pilocytic astrocytoma |c Christine Jungk, Annekathrin Reinhardt, Rolf Warta, David Capper, Andreas von Deimling, Christel Herold-Mende and Andreas Unterberg |
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| 520 | |a In adults, pilocytic astrocytomas (PA) account for less than 2% of gliomas, resulting in uncertainty regarding the clinical course and optimal treatment, particularly in cases where gross total resection (GTR) could not be achieved. Moreover, information on molecular markers and their prognostic impact is sparse. In order to improve risk stratification, we analyzed our institutional series of 58 patients aged 17 years and older with histology-proven intracranial PA World Health Organization grade I for clinical and molecular prognosticators. Anaplastic and NF1-associated tumors were excluded. O-6-methylguanine-DNA methyltransferase (MGMT) promoter methylation status was determined by pyrosequencing or 450k/850k DNA methylation array. A univariate log-rank test and multivariate StepAIC were applied to identify prognostic factors. The median age was 30 years (range 17–66). Tumors were located in the cerebral/cerebellar hemispheres, midline structures and cerebello-pontine angle in 53%, 38% and 9%. MGMT promoter methylation was present in eight patients (14%). GTR (39/58 patients) significantly reduced the likelihood of tumor recurrence (p = 0.0001). Tumor relapse occurred in 16 patients (28%) after a median progression-free survival (PFS) of 135 months (range 6–153 months); there was one tumor-related death. PFS at 5 and 10 years was 67% and 53%. In multivariate analysis, PFS was significantly prolonged in patients with GTR (HR 0.1; CI 0.03–0.37; p < 0.001), unmethylated MGMT promoter (HR 0.18; CI 0.05–0.64; p = 0.009) and midline tumors (HR 0.21; CI 0.06–0.78; p = 0.02). In conclusion, MGMT promoter methylation status and tumor location were identified as novel prognostic factors in adult PAs, pointing at distinct molecular subtypes and detecting patients in need of close observance and intensified treatment. | ||
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