xahnegrey40, thanks.
As I understand the story he'd been watching his PSA in the danger zone for several years and then about a year ago it spiked up, he was further diagnosed and sent immediately for radiation, and afterwards started ADT, but I'll check back on that. Don't believe they found any bone involvement at that time.

He's had various aches and pains for many years but not diagnosed with anything, was still doing a fair amount of running up to a few years ago, last marathon (or half?) was, oh, must be a while now, maybe around age 70+? But very little to none in the last year. He's out and about every day just not as athletically as before.

He's not talking to a lot of people about this but I've talked nutrition and general health with him often enough for many years. I will also see if his PCP is referring him back to the oncologist as you suggest. Thanks for your suggestions.