Total dose was 45 Gy in 3 fractions, prescribed to the 80% isodose,
encompassing PTV. Treatment was performed twice a week,
for a total duration of 6–10 days. Dosimetric constraints to OAR
relied on QUANTEC recommendations for 3 fractions SBRT [10–
12]. Treatment was performed by Cyberknife (Accuray Inc,
Sunnyvale, USA), delivering 6 MV photons. Synchrony system
was used, allowing real time target tracking.