As an example, shown in Figure 2, the estimated survival curves of four prognostic groups represented by a fixed age (65 years) and all having undergone resection: For the best prognostic group (called Good) characterized by PS = 0, no use of corticosteroids, unifocal disease, and a MGMT-methylated tumor the estimated median overall survival is 22.3 months (95% CI: 19.4–25.7). Here, MGMT is linked to neoplasm.