Cited by 114Glioma Diagnosis and TreatmentDNA Repair MechanismsPARP inhibition in cancer therapy

MGMT in primary and recurrent human glioblastomas after radiation and chemotherapy and comparison with p53 status and clinical outcome

Wiewrodt, Dorothee, Nagel, Georg, Dreimüller, Nadine, Hundsberger, Thomas, Perneczky, Axel, Kaina, Bernd·2008·International Journal of Cancer

Abstract

The DNA repair protein O(6)-methylguanine-DNA methyltransferase (MGMT) plays a pivotal role in alkylating drug resistance. Here, we determined MGMT activity in primary and recurrent glioblastomas (GBM, WHO grade IV) of patients who received radiation therapy (RT) or RT plus chemotherapy with alkylating agents (temozolomide, chloroethylnitrosoureas). The mean MGMT activity of untreated GBM was 37 +/- 45 (range 0-205) fmol/mg proteins. In the 1st, 2nd and 3rd recurrences, MGMT activity increased from 66 +/- 50 (13-194) to 68 +/- 44 (14-143) and 182 +/- 163 (64-423) fmol/mg protein, respectively. Comparing patients who received RT only with RT plus chemotherapy, a significant increase of MGMT in 1st recurrences was only found after treatment with RT plus chemotherapy, indicating either selection of MGMT expressing cells or induction of the MGMT gene by alkylating agents. The p53 status was not significantly related to the MGMT expression level, although a trend for lower MGMT activity in p53 positively stained tumors was observed. Patients expressing MGMT activity of <or=30 fmol/mg protein in the pretreatment tumor had a significant better therapeutic response than patients expressing MGMT above this level, which was shown by Kaplan-Meyer curves and the recurrence free interval after primary tumor resection. In patients who received RT only, this correlation was not found. The data revealed a threshold of MGMT expression (30 fmol/mg protein) below which patients respond better to alkylating agents. Therefore, determination of MGMT activity in the primary tumor appears to be useful in predicting the outcome of GBM therapy.

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Crossref · 10.1002/ijc.23219

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  • TP53 expression in newly diagnosed versus recurrent glioblastoma tumors has shown inconsistent results as to whether expression is altered upon recurrence.

    “TP53 expression has been compared in newly diagnosed patients and recurrent tumors with inconsistent results as to whether expression is altered upon recurrence [16,17,18].”

    From The p53 Pathway in Glioblastoma (2018) · cites this paper as [18]

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Authors
Wiewrodt, D., Nagel, G., Dreimüller, N., Hundsberger, T., Perneczky, A., & Kaina, B.
Affiliations
  • Johannes Gutenberg University Mainz (DE)
  • Kantonsspital St. Gallen (CH)
Corresponding author
Kaina, Bernd
Venue
International Journal of Cancer
Publisher
Wiley
Published
2007-11-13
Volume
122
Issue
6
Pages
1391-1399
ISSN
  • 0020-7136 (ISSN-L)
  • 1097-0215
OpenAlex
W1982993379
Cited by
114
References
53
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 3 · 2022: 9 · 2021: 11 · 2020: 12 · 2019: 6 · 2018: 6 · 2017: 4 · 2016: 7 · 2015: 5 · 2014: 5 · 2013: 4 · 2012: 4
FWCI
3.11
Type
journal article
Language
en
Open access
closed
Locations
  • International Journal of Cancer (publishedVersion)
  • PubMed (publishedVersion)
Funders
DFG (KA 724/13-1, 13/2, SFB432/B7)
Topics
  • Health Sciences › Medicine › Genetics › Glioma Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Oncology › PARP inhibition in cancer therapy
Keywords
MGMT, O6-methylguanine-DNA methyltransferase, glioblastoma, recurrent glioblastoma, alkylating agent resistance, temozolomide, chloroethylnitrosoureas, radiotherapy, p53 status, prognostic factors, treatment response prediction, recurrence-free interval
MeSH terms
Brain Neoplasms, Combined Modality Therapy, Glioblastoma, Humans, Recurrence, DNA Modification Methylases, Survival Analysis, Tumor Suppressor Protein p53, Treatment Outcome, Tumor Suppressor Proteins, DNA Repair Enzymes

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