Fig. 1

Actuarial overall survival (Kaplan–Meier curves), p < 0.001 (pooled over all strata). 8-Gy single-fraction was associated with significantly shorter survival than all 3 other regimens (p = 0.025, < 0.001, and < 0.001, respectively). Fractionated stereotactic radiotherapy was associated with longer survival than fractionated non-stereotactic, p = 0.004. The difference between the 2 stereotactic groups was not significant, p = 0.13