Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter Methylation
Introduction: O6-methylguanine-methyltransferase (MGMT) promoter methylation and isocitrate dehydrogenase (IDH) mutation status are important prognostic factors for patients with glioblastoma. There are conflicting reports about a differential topographical distribution of glioblastoma with vs. with...
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doaj-098352aa8b004aad8000017761ad82732020-11-25T02:05:11ZengFrontiers Media S.A.Frontiers in Oncology2234-943X2020-05-011010.3389/fonc.2020.00596529909Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter MethylationFatih Incekara0Fatih Incekara1Sebastian R. van der Voort2Hendrikus J. Dubbink3Peggy N. Atmodimedjo4Rishi Nandoe Tewarie5Geert Lycklama6Arnaud J. P. E. Vincent7Johan M. Kros8Stefan Klein9Martin van den Bent10Marion Smits11Department of Neurosurgery, Brain Tumor Center, Erasmus MC - University Medical Center Rotterdam, Rotterdam, NetherlandsDepartment of Radiology and Nuclear Medicine, Erasmus MC - University Medical Center Rotterdam, Rotterdam, NetherlandsDepartment of Radiology and Nuclear Medicine, Erasmus MC - University Medical Center Rotterdam, Rotterdam, NetherlandsDepartment of Pathology, Brain Tumor Center at Erasmus MC Cancer Institute, Rotterdam, NetherlandsDepartment of Pathology, Brain Tumor Center at Erasmus MC Cancer Institute, Rotterdam, NetherlandsDepartment of Neurosurgery, Haaglanden MC, The Hague, NetherlandsDepartment of Radiology, Haaglanden MC, The Hague, NetherlandsDepartment of Neurosurgery, Brain Tumor Center, Erasmus MC - University Medical Center Rotterdam, Rotterdam, NetherlandsDepartment of Pathology, Brain Tumor Center at Erasmus MC Cancer Institute, Rotterdam, NetherlandsDepartment of Radiology and Nuclear Medicine, Erasmus MC - University Medical Center Rotterdam, Rotterdam, NetherlandsDepartment of Neurology, Brain Tumor Center, Erasmus MC Cancer Institute, Rotterdam, NetherlandsDepartment of Radiology and Nuclear Medicine, Erasmus MC - University Medical Center Rotterdam, Rotterdam, NetherlandsIntroduction: O6-methylguanine-methyltransferase (MGMT) promoter methylation and isocitrate dehydrogenase (IDH) mutation status are important prognostic factors for patients with glioblastoma. There are conflicting reports about a differential topographical distribution of glioblastoma with vs. without MGMT promoter methylation, possibly caused by molecular heterogeneity in glioblastoma populations. We initiated this study to re-evaluate the topographical distribution of glioblastoma with vs. without MGMT promoter methylation in light of the updated WHO 2016 classification.Methods: Preoperative T2-weighted/FLAIR and postcontrast T1-weighted MRI scans of patients aged 18 year or older with IDH wildtype glioblastoma were collected. Tumors were semi-automatically segmented, and the topographical distribution between glioblastoma with vs. without MGMT promoter methylation was visualized using frequency heatmaps. Then, voxel-wise differences were analyzed using permutation testing with Threshold Free Cluster Enhancement.Results: Four hundred thirty-six IDH wildtype glioblastoma patients were included; 211 with and 225 without MGMT promoter methylation. Visual examination suggested that when compared with MGMT unmethylated glioblastoma, MGMT methylated glioblastoma were more frequently located near bifrontal and left occipital periventricular area and less frequently near the right occipital periventricular area. Statistical analyses, however, showed no significant difference in topographical distribution between MGMT methylated vs. MGMT unmethylated glioblastoma.Conclusions: This study re-evaluated the topographical distribution of MGMT promoter methylation in 436 newly diagnosed IDH wildtype glioblastoma, which is the largest homogenous IDH wildtype glioblastoma population to date. There was no statistically significant difference in anatomical localization between MGMT methylated vs. unmethylated IDH wildtype glioblastoma.https://www.frontiersin.org/article/10.3389/fonc.2020.00596/fullglioblastomaMGMTheatmapatlaslocalization |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fatih Incekara Fatih Incekara Sebastian R. van der Voort Hendrikus J. Dubbink Peggy N. Atmodimedjo Rishi Nandoe Tewarie Geert Lycklama Arnaud J. P. E. Vincent Johan M. Kros Stefan Klein Martin van den Bent Marion Smits |
spellingShingle |
Fatih Incekara Fatih Incekara Sebastian R. van der Voort Hendrikus J. Dubbink Peggy N. Atmodimedjo Rishi Nandoe Tewarie Geert Lycklama Arnaud J. P. E. Vincent Johan M. Kros Stefan Klein Martin van den Bent Marion Smits Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter Methylation Frontiers in Oncology glioblastoma MGMT heatmap atlas localization |
author_facet |
Fatih Incekara Fatih Incekara Sebastian R. van der Voort Hendrikus J. Dubbink Peggy N. Atmodimedjo Rishi Nandoe Tewarie Geert Lycklama Arnaud J. P. E. Vincent Johan M. Kros Stefan Klein Martin van den Bent Marion Smits |
author_sort |
Fatih Incekara |
title |
Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter Methylation |
title_short |
Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter Methylation |
title_full |
Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter Methylation |
title_fullStr |
Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter Methylation |
title_full_unstemmed |
Topographical Mapping of 436 Newly Diagnosed IDH Wildtype Glioblastoma With vs. Without MGMT Promoter Methylation |
title_sort |
topographical mapping of 436 newly diagnosed idh wildtype glioblastoma with vs. without mgmt promoter methylation |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Oncology |
issn |
2234-943X |
publishDate |
2020-05-01 |
description |
Introduction: O6-methylguanine-methyltransferase (MGMT) promoter methylation and isocitrate dehydrogenase (IDH) mutation status are important prognostic factors for patients with glioblastoma. There are conflicting reports about a differential topographical distribution of glioblastoma with vs. without MGMT promoter methylation, possibly caused by molecular heterogeneity in glioblastoma populations. We initiated this study to re-evaluate the topographical distribution of glioblastoma with vs. without MGMT promoter methylation in light of the updated WHO 2016 classification.Methods: Preoperative T2-weighted/FLAIR and postcontrast T1-weighted MRI scans of patients aged 18 year or older with IDH wildtype glioblastoma were collected. Tumors were semi-automatically segmented, and the topographical distribution between glioblastoma with vs. without MGMT promoter methylation was visualized using frequency heatmaps. Then, voxel-wise differences were analyzed using permutation testing with Threshold Free Cluster Enhancement.Results: Four hundred thirty-six IDH wildtype glioblastoma patients were included; 211 with and 225 without MGMT promoter methylation. Visual examination suggested that when compared with MGMT unmethylated glioblastoma, MGMT methylated glioblastoma were more frequently located near bifrontal and left occipital periventricular area and less frequently near the right occipital periventricular area. Statistical analyses, however, showed no significant difference in topographical distribution between MGMT methylated vs. MGMT unmethylated glioblastoma.Conclusions: This study re-evaluated the topographical distribution of MGMT promoter methylation in 436 newly diagnosed IDH wildtype glioblastoma, which is the largest homogenous IDH wildtype glioblastoma population to date. There was no statistically significant difference in anatomical localization between MGMT methylated vs. unmethylated IDH wildtype glioblastoma. |
topic |
glioblastoma MGMT heatmap atlas localization |
url |
https://www.frontiersin.org/article/10.3389/fonc.2020.00596/full |
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