title: Limited role for extended maintenance temozolomide for newly diagnosed glioblastoma.
abstract: OBJECTIVE
  To explore an association with survival of modifying the current standard of care for patients with newly diagnosed glioblastoma of surgery followed by radiotherapy plus concurrent and 6 cycles of maintenance temozolomide chemotherapy (TMZ/RT → TMZ) by extending TMZ beyond 6 cycles.
  
  
  METHODS
  The German Glioma Network cohort was screened for patients with newly diagnosed glioblastoma who received TMZ/RT → TMZ and completed ≥6 cycles of maintenance chemotherapy without progression. Associations of clinical patient characteristics, molecular markers, and residual tumor determined by magnetic resonance imaging after 6 cycles of TMZ with progression-free survival (PFS) and overall survival (OS) were analyzed with the log-rank test. Multivariate analyses using the Cox proportional hazards model were performed to assess associations of prolonged TMZ use with outcome.
  
  
  RESULTS
  Sixty-one of 142 identified patients received at least 7 maintenance TMZ cycles (median 11, range 7-20). Patients with extended maintenance TMZ treatment had better PFS (20.5 months, 95% confidence interval [CI] 17.7-23.3, vs 17.2 months, 95% CI 10.2-24.2,p= 0.035) but not OS (32.6 months, 95% CI 28.9-36.4, vs 33.2 months, 95% CI 25.3-41.0,p= 0.126). However, there was no significant association of prolonged TMZ chemotherapy with PFS (hazard ratio [HR] = 0.8, 95% CI 0.4-1.6,p= 0.559) or OS (HR = 1.6, 95% CI 0.8-3.3,p= 0.218) adjusted for age, extent of resection, Karnofsky performance score, presence of residual tumor, O6-methylguanine DNA methyltransferase(MGMT)promoter methylation status, or isocitrate dehydrogenase (IDH) mutation status.
  
  
  CONCLUSIONS
  These data may not support the practice of prolonging maintenance TMZ chemotherapy beyond 6 cycles.
  
  
  METHODS
  This study provides Class III evidence that in patients with newly diagnosed glioblastoma, prolonged TMZ chemotherapy does not significantly increase PFS or OS.
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany. dorothee.gramatzki@usz.ch.
authors.forename: Dorothee
authors.initials: D
authors.lastname: Gramatzki
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Kickingereder
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Bettina
authors.initials: B
authors.lastname: Hentschel
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Felsberg
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Herrlinger
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Schackert
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Jörg-Christian
authors.initials: JC
authors.lastname: Tonn
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Westphal
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Sabel
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Uwe
authors.initials: U
authors.lastname: Schlegel
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wick
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Torsten
authors.initials: T
authors.lastname: Pietsch
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Guido
authors.initials: G
authors.lastname: Reifenberger
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Loeffler
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Bendszus
authors.affiliation: From the Department of Neurology and Brain Tumor Center (D.G., M.W.), University Hospital Zurich and University of Zurich, Switzerland; Department of Neuroradiology (P.K., M.B.), University Hospital of Heidelberg; Institute for Medical Informatics, Statistics and Epidemiology (B.H., M.L.), University of Leipzig; Departments of Neuropathology (J.F., G.R.) and Neurosurgery (M.S.), Heinrich-Heine University Düsseldorf; Division of Neurooncology (U.H.), Department of Neurology, University Medical Center Bonn; Department of Neurosurgery (G.S.), University of Dresden; Department of Neurosurgery (J.-C.T.), Ludwig Maximilians University Munich; Department of Neurosurgery (M.W.), University Medical Center Hamburg-Eppendorf, Hamburg; Department of Neurology (U.S.), Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum; Clinical Cooperation Unit Neurooncology (W.W.), German Cancer Consortium, German Cancer Research Center, and Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg; Department of Neuropathology (T.P.), DGNN Brain Tumor Reference Center, University of Bonn Medical School; and German Cancer Consortium (G.R.), German Cancer Research Center Heidelberg, Partner Site Essen/Düsseldorf, Düsseldorf, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Weller
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D018906:Antineoplastic Agents, Alkylating / Q000627:therapeutic use*; D001932:Brain Neoplasms / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000235:genetics; D015331:Cohort Studies; D019175:DNA Methylation / Q000187:drug effects / Q000235:genetics; D015254:DNA Modification Methylases / Q000235:genetics; D045643:DNA Repair Enzymes / Q000235:genetics; D003606:Dacarbazine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D018572:Disease-Free Survival; D005260:Female; D005909:Glioblastoma / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000235:genetics; D006801:Humans; D007521:Isocitrate Dehydrogenase / Q000235:genetics; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics; D012737:Sex Factors; D018709:Statistics, Nonparametric; D000077204:Temozolomide; D016896:Treatment Outcome; D025521:Tumor Suppressor Proteins / Q000235:genetics; D055815:Young Adult
chemical_list: D018906:Antineoplastic Agents, Alkylating; D025521:Tumor Suppressor Proteins; D003606:Dacarbazine; D007521:Isocitrate Dehydrogenase; D015254:DNA Modification Methylases; C515491:MGMT protein, human; D045643:DNA Repair Enzymes; D000077204:Temozolomide