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Progressing Bevacizumab-Induced Diffusion Restriction Is Associated with Coagulative Necrosis Surrounded by Viable Tumor and Decreased Overall Survival in Patients with Recurrent Glioblastoma. AJNR Am J Neuroradiol 2016 Dec;37(12):2201-2208 PMID: 27492073 PMCID: PMC5161572

Pubmed ID

27492073

Abstract

BACKGROUND AND PURPOSE: Patients with recurrent glioblastoma often exhibit regions of diffusion restriction following the initiation of bevacizumab therapy. Studies suggest that these regions represent either diffusion-restricted necrosis or hypercellular tumor. This study explored postmortem brain specimens and a population analysis of overall survival to determine the identity and implications of such lesions.

MATERIALS AND METHODS: Postmortem examinations were performed on 6 patients with recurrent glioblastoma on bevacizumab with progressively growing regions of diffusion restriction. ADC values were extracted from regions of both hypercellular tumor and necrosis. A receiver operating characteristic analysis was performed to define optimal ADC thresholds for differentiating tissue types. A retrospective population study was also performed comparing the overall survival of 64 patients with recurrent glioblastoma treated with bevacizumab. Patients were separated into 3 groups: no diffusion restriction, diffusion restriction that appeared and progressed within 5 months of bevacizumab initiation, and delayed or stable diffusion restriction. An additional analysis was performed assessing tumor O-methylguanine-DNA-methyltransferase methylation.

RESULTS: The optimal ADC threshold for differentiation of hypercellularity and necrosis was 0.736 × 10mm/s. Progressively expanding diffusion restriction was pathologically confirmed to be coagulative necrosis surrounded by viable tumor. Progressive lesions were associated with the worst overall survival, while stable lesions showed the greatest overall survival (P < .05). Of the 40% of patients with O-methylguanine-DNA-methyltransferase methylated tumors, none developed diffusion-restricted lesions.

CONCLUSIONS: Progressive diffusion-restricted lesions were pathologically confirmed to be coagulative necrosis surrounded by viable tumor and associated with decreased overall survival. Stable lesions were, however, associated with increased overall survival. All lesions were associated with O-methylguanine-DNA-methyltransferase unmethylated tumors.

Author List

Nguyen HS, Milbach N, Hurrell SL, Cochran E, Connelly J, Bovi JA, Schultz CJ, Mueller WM, Rand SD, Schmainda KM, LaViolette PS

Authors

Joseph A. Bovi MD Associate Professor in the Radiation Oncology department at Medical College of Wisconsin
Peter LaViolette PhD Associate Professor in the Radiology department at Medical College of Wisconsin
Wade M. Mueller MD Professor in the Neurosurgery department at Medical College of Wisconsin
Scott D. Rand MD, PhD Professor in the Radiology department at Medical College of Wisconsin
Kathleen M. Schmainda PhD Professor in the Radiology department at Medical College of Wisconsin
Christopher J. Schultz MD Chair, Professor in the Radiation Oncology department at Medical College of Wisconsin




Scopus

2-s2.0-85006469905   10 Citations

MESH terms used to index this publication - Major topics in bold

Adult
Aged
Antineoplastic Agents
Bevacizumab
Brain Neoplasms
Diffusion Magnetic Resonance Imaging
Female
Glioblastoma
Humans
Male
Middle Aged
Necrosis
Neoplasm Recurrence, Local
Retrospective Studies
jenkins-FCD Prod-256 97250b83e4554f37bec91ca291f44ff4aedcc508