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Kaplan-Meier plots of overall survival (OS) according to T/S (A), ring enhancement (B), pre-treatment MRI tumor volume (C), post-treatment MRI tumor volume at maximum response (D), degree of MRI tumor volume reduction (E), and pre-treatment 18F-DOPA PET tumor volume (F). 18F-DOPA PET and MRI (based on FLAIR images) tumor volume measurements were categorized considering tertiles of each distribution.
