Abstract
In meningiomas, prognostic impact of mutations in the human telomerase reverse transcriptase (hTERT) promoter region was recently shown, while studies of promoter methylation and analyses of hemangiopericytomas are lacking. hTERT promoter methylation was analyzed in 78 meningioma and 38 meningeal hemangiopericytoma samples by methylation-specific polymerase chain reaction (MS-PCR) and compared with histopathological and clinical variables and with immunohistochemical hTERT expression. Promoter methylation was found in 62 samples (53 %) and tended to be higher in meningiomas (N = 19/41, 46 %) than in hemangiopericytomas (N = 8/33, 24 %, p = .057). In meningiomas, methylation was 16, 60 and 77 % in grade I, II and III tumors (p < .001) and higher in recurrent (N = 33/37, 89 %) than in primary diagnosed (N = 19/41, 46 %) tumors (OR 5.14, 95 % CI 1.34–19.71, p = .017). Univariate analyses showed shorter mean progression free and overall survival in methylated than in unmethylated individuals (26 vs. 100 months; p = .045 and 110 vs. 113 months; p = .025, respectively). Moreover, hTERT expression was found in 70 % (N = 53) and was more frequent in methylated than in unmethylated samples (78 vs. 52 %, OR 3.36, 95 % CI 1.20–9.40, p = .021). In hemangiopericytomas, methylation was similar in grade II (24 %) and III (25 %, p > .05) and in primary (24 %) and recurrent tumors (40 %, p > .05). hTERT expression was similar as compared to meningiomas (74 %, N = 28, p > .05) but was independent of promoter methylation (OR 4.26, 95 % CI 0.47–39.0, p = .199). In meningeal tumors, hTERT promoter methylation is more common than mutations and in meningiomas but not in hemangiopericytomas positively correlated with WHO grade and hTERT expression.
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Acknowledgments
This work received funding by the German Society of Neurosurgery (Stiftung Neurochirurgische Forschung der Deutschen Gesellschaft für Neurochirurgie). The funder was not involved in design of the study, laboratory research and analysis of the results. We also cordially thank Björn Koos for the support of the laboratory research. There are no financial or intellectual conflicts of interest.
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This study (recipient BB) was funded by the German Society of Neurosurgery (Stiftung Neurochirurgische Forschung der Deutschen Gesellschaft für Neurochirurgie).
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This is a retrospective, non-interventional study. Data collection and scientific use was approved by the local ethics committee and permitted by the patients in each single case (Muenster 2007-420-f-S). This article does not contain any studies with human participants or animals performed by any of the authors.
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Fürtjes, G., Köchling, M., Peetz-Dienhart, S. et al. hTERT promoter methylation in meningiomas and central nervous hemangiopericytomas. J Neurooncol 130, 79–87 (2016). https://doi.org/10.1007/s11060-016-2226-6
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DOI: https://doi.org/10.1007/s11060-016-2226-6