@brianjarvis
Thanks Brian for this info. I tried to find studies done for salvage RT and could not find any. The closest that I found was this on UCLA site :

"Researchers observed a significant interaction between ADT sequencing and RT field size for all study endpoints except overall survival. For patients receiving prostate-only RT, ADT occurring during and after radiation was associated with improved metastasis-free survival compared with neoadjuvant/concurrent ADT.

However, with patients receiving whole-pelvis RT, no significant difference was observed with ADT sequencing, except greater distant metastasis occurrence among those who had concurrent/adjuvant ADT. "

This statement is also referring to initial whole prostate RT (primary RT) , but the last sentence refers to the "whole pelvis" RT which is actually more similar to salvage RT, I guess ?

I you happen to have any papers that refer specifically to salvage RT and initiation of ADT timing, please post them here (when you find time) - thanks so much in advance 🙏.