Patients with local tumor response to SBRT have improved survival outcomes. Kaplan-Meier curves of PFS and OST by response. Panel A: Median PFST was 475 days (95% CI = 193–598) vs. 119 days (95% CI = 90–241) (P = 0.0547). Panel B: Median OST was 475 days (95% CI = 222–714) vs. 201 (95% CI = 143–244) for non-responders (P = 0.0093). Tick marks indicate time of censoring. Panel C: Stacked bar chart showing breakdown of best overall response by those classified as CR (6.5%), PR (23.9%), SD (41.3%), and PD (28.3%). Tick marks indicate time of censoring, faded regions indicate 95% confidence intervals.