Hi Soli, it is very hard to know ahead of time how will one's body react to radiation. Same goes with ADT.
However, there is a new test available that is called PROSTOX
https://miradx.com/prostox/
It can predict if you are genetically more sensitive to radiation than average person and than your doctor can adjust the type or strength of radiation per session. It is new and not FDA approved but doctors do order it for their patients. Ask about it !!!!

BTW- salvage and adjuvant can cause short term and long term toxicity and % are in single numbers BUT, I am sure that those 5 % that DO have long term problems do not find that 2-5 % "a small" number any more. Your concerns are legitimate and it is good thing that you want to know all about side effects and so can weight your pros and cons accordingly. When person has rising PSA than there is no dilemma - one has to do what one has to do. In case of an adjuvant it is much harder decision.

Also, there is a difference in toxicity level between adjuvant and salvage especially if person did not heal completely before having a super early treatment ! The earlier you have adjuvant, the more side effects happen. If one still has small incontinence, it is likely to stay that way and same goes for ED.

You will have a chance to go over everything with your doctor and also you may want to have second opinion about your case. There is no rush if your first PSA comes back really undetectable so you are wise to take time to explore all options and than make informed decision.

Wishing you the best of luck and complete success with whatever you decide 🍀🌺🍀