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2015 ; 2015
(ä): 604719
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The Prognostic Value of Pyrosequencing-Detected MGMT Promoter Hypermethylation in
Newly Diagnosed Patients with Glioblastoma
#MMPMID26347581
Villani V
; Casini B
; Pace A
; Prosperini L
; Carapella CM
; Vidiri A
; Fabi A
; Carosi M
Dis Markers
2015[]; 2015
(ä): 604719
PMID26347581
show ga
O6-methylguanine-DNA-methyltransferase (MGMT) has emerged as a relevant predictor
of therapeutic response and good prognosis in patients with glioblastoma (GBM).
Transcriptionally active MGMT rapidly removes the alkyl adducts, preventing the
formation of cross-links and thereby causing resistance to alkylating drugs.
Studies with pyrosequencing (PSQ) showed that this technique has a higher
reproducibility and sensitivity than other techniques. However, the definition of
a prognostically relevant threshold for the percentage of MGMT methylation
remains one of the most critical issues in the use of PSQ analysis. The aim of
this study was to define the cut-off value correlated with good favourable
prognostic outcomes. We retrospectively analyzed 51 patients (33 males, 18
females) with GBM who underwent surgery or biopsy. The Receiver Operating
Characteristics analysis showed that the best possible criteria for PSQ-detected
percentage of MGMT methylation that predicted progression-free survival (PFS) and
overall survival (OS) were 19% and 13%, respectively. Patients with ? 19% of
PSQ-detected MGMT had a shorter PFS (HR: 0.24, p < 0.01); those ones with ? 13%
had a shorter OS (HR: 0.33, p < 0.05). Our study reinforces the importance of
MGMT in the management of GBM patients, but future studies with larger sample
sizes are warranted to confirm our findings.