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Survival probability of tumor subgroups according to the 2016 World Health Organization classification. (A) Tumor grade-based Ki-67 labeling index and IDH status. (B) Classification of tumor grade based on the patient's overall survival. The mean survival time is reported with 95% CI. 95% CI, 95% confidence interval; DF, degrees of freedom; IDH, isocitrate dehydrogenase; wt, wild-type; mut, mutant.
