The same regression analysis was conducted to predict EOR: WHO grade II IDH wt (R2 = 0.5; b = -24; ES = 5; ß = -0.4; p = 0.0001) and mut (R2 = 0.5; b = -14; ES = 3; ß = -0.3; p = 0.0001) gliomas and WHO grade III IDH mut (R2 = 0.5; b = -15; ES = 3.6; ß = -0.3; p = 0.0001), insular (R2 = 0.5; b = -11; ES = 3; ß = -0.3; p = 0.0001), and thalamic (R2 = 0.5; b = -10.5; ES = 6; ß = -0.1; p = 0.0001) gliomas were related to lower EOR. This evidence concerns the gene IDH1 and central nervous system cancer.