Abstract
Purpose
C-11 methionine (MET) PET is commonly used for diagnosing high-grade glioma (HGG). Recently, volumetric analysis has been widely applied to oncologic PET imaging. In this study, we investigated the prognostic value of metabolic tumor volume (MTV) on MET PET in HGG.
Methods
A total of 30 patients with anaplastic astrocytoma (n = 12) and glioblastoma multiforme (n = 18) who underwent MET PET before treatment (surgery followed by chemo-radiotherapy) were retrospectively enrolled. Maximal tumor-to-normal brain ratio (TNRmax, maximum tumor activity divided by mean of normal tissue) and MTV (volume of tumor tissue that shows uptake >1.3-fold of mean uptake in normal tissue) were measured on MET PET. Adult patients were classified into two subgroups according to Radiation Therapy Oncology Group Recursive Partitioning Analysis (RTOG RPA) classification. Prognostic values of TNRmax, MTV and clinicopathologic factors were evaluated with regard to progression-free survival (PFS).
Results
Median PFS of all patients was 7.9 months (range 1.0–53.8 months). In univariate analysis, MTV (cutoff 35 cm3) was a significant prognostic factor for PFS (P = 0.01), whereas TNRmax (cutoff 3.3) and RTOG RPA class were not (P = 0.80 and 0.61, respectively). Treatment of surgical resection exhibited a borderline significance (P = 0.06). In multivariate analysis, MTV was the only independent prognostic factor for PFS (P = 0.03).
Conclusion
MTV on MET PET is a significant and independent prognostic factor for PFS in HGG patients, whereas TNRmax is not. Thus, performing volumetric analysis of MET PET is recommended in HGG for better prognostication.
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Conflict of Interest
Min Young Yoo, Jin Chul Paeng, Gi Jeong Cheon, Dong Soo Lee, June-Key Chung, E. Edmund Kim and Keon Wook Kang declare that they have no conflict of interest.
Ethical Statement
All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study design was approved by the Institutional Review Board of Seoul National University Hospital (1504-046-663). The manuscript has not been published before, is not under consideration for publication anywhere else and has been approved by all coauthors.
Informed Consent
Written informed consents were waived by the Institutional Review Board of Seoul National University Hospital.
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Yoo, M.Y., Paeng, J.C., Cheon, G.J. et al. Prognostic Value of Metabolic Tumor Volume on 11C-Methionine PET in Predicting Progression-Free Survival in High-Grade Glioma. Nucl Med Mol Imaging 49, 291–297 (2015). https://doi.org/10.1007/s13139-015-0362-0
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DOI: https://doi.org/10.1007/s13139-015-0362-0