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The predictive score consists of the sum of the following factors: male gender (1), CNS invasion detected by histopathology or intraoperative assessment (1), WHO grade II or III (2) and Simpson grade >3 (2). Scoring groups of 0–2, 3–4 and 5–6 were generated and showed a significant difference in tumor recurrence of 33.8, 64.7 and 88.5%, respectively (recurrence red, non-recurrence blue, 5-year follow-up or longer, asterisk (*): statistically significant result).
