What dose and fractionation would you use for a non-operable solitary fibrous tumor in the lumbar vertebra with definitive intent?

I remain unconvinced that protons offer better high-dose dosimetry (unless you believe in the shower/bath theory). Max dose will be less with fancy IGRT/IMRT (like 2 Gy a day Cyberknife). There might be no spinal cord, so you might be able to push the dose. I have no experience in such SBRT, but it ...