Abstract
Purpose
Relatively few studies have been performed on molecular properties of pediatric glioblastoma multiforme (GBM). Methylation of DNA repair gene O6-methylguanine-DNA methyltransferase (MGMT) promoter region has been associated with favorable prognosis and prolonged survival in adult GBM patients treated with temozolomide (TMZ). We explored the frequency of MGMT gene promoter methylation in pediatric glioblastomas and compared it with the known molecular alterations in p53.
Methods
Twenty pediatric GBM cases were selected. MGMT promoter methylation was assessed by methylation specific PCR. p53 expression was determined by immunohistochemistry.
Results
MGMT gene promoter methylation was observed in 50% of pediatric glioblastomas. p53 protein expression was detected in 60% of cases. Seventy percent of cases with methylated MGMT promoter were p53 immunopositive.
Conclusions
The frequency of MGMT gene promoter methylation in pediatric GBMs was similar to adult GBM patients. The pediatric GBMs should also be investigated for MGMT promoter methylation to identify a subset of patients likely to benefit from TMZ therapy. p53 protein overexpression was more common in pediatric primary GBMs. To the best of our knowledge this is only the second study on MGMT gene promoter methylation status in pediatric GBMs.
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Acknowledgement
We are thankful to Dr. Monika E. Hegi from the Laboratory of Tumor Biology and Genetics, Department of Neurosurgery, University Hospital, Lausanne, Switzerland, who trained PJ in her laboratory on this technique.
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Srivastava, A., Jain, A., Jha, P. et al. MGMT gene promoter methylation in pediatric glioblastomas. Childs Nerv Syst 26, 1613–1618 (2010). https://doi.org/10.1007/s00381-010-1214-y
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DOI: https://doi.org/10.1007/s00381-010-1214-y