I was diagnosed T4M1N1 Stage 4 back in 2018 with metastatic spread to my hip.
My Oncologist threw all treatments at it, lifetime HT, chemo and radiotherapy. It was a tough gig for a few months, 7 years on I'm still soldiering on, PSA has been undetectable for a few years now although I still get the yips for the few days between blood test and PSA results.
Good luck with your treatment choice, this forum particularly in the early stages when your head is all over the place is a terrific source of support.