Did you know what his Gleason score is, That number can tell you how aggressive the cancer is. It could be the reason he only lasted one year on hormones. How high is his PSA right now?

Did they get a Decipher test For him? That also tells you the likelihood that it’s going to spread soon. See if you can get that test done

Did he get a PSMA PET scan? Is that how you know the location of his lesions?

You’re at a crossover where it comes to treatment. You really need to do the chemo soon because it may work better, sooner, when you have fewer and less aggressive tumors. If you hold off the chemo Tumors will grow. The higher the Gleeson score the more likely it will spread quicker. 9 or 10 Gleason scores means it is very aggressive. Does the diagnosis mention intraductal or cribriform, they are more aggressive things, if found.