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Overall survival (OS) rate of patients operated on for primary glioblastoma, according to: (a) age group (<65 vs. ≥65 years old); (b) type of surgery (gross total resection vs. subtotal resection vs. partial resection); (c) tumor unifocality vs. multifocality; (d) O6-Methylguanine-DNA methyltransferase promoter methylation status (methylated vs. unmethylated).
