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Fig. 4A. —Illustration of final Cox model using Kaplan-Meier curves for
length of recurrence-free survival (RFS). Resulting model from stepwise Cox
analysis showed initial MRI tumor volume (p = 0.0051) and final
change in MRI tumor volume (p = 0.0028) to be most significant
independent predictors. 
Vol = volume decrease. Patients divided based on
initial MRI volume of their tumors showed significant differences in RFS
(p = 0.042, Wilcoxon's test). The 2-year RFS rate was 93% for
patients with smaller tumor volumes of 33 cm3 or less (n =
30) compared with 70% for those with larger tumors (n = 28).
