@ecurb
You say the cancer went to his bones. Are you saying it wasn’t treated and he was just put on ADT and Erleada? If his PSA is .07 then at this point there doesn’t appear to be much in the way of cancer in his bones still causing a major problem, the ADT and Erleada may have shrunk it And stopped it from growing. That does happen for some people.

Not exactly a case for urgent attention, yet.

Is he under 65 or doesn’t have Medicare is that what’s causing him to Pay so much? If he’s truly paying that much every month, he could get an ACA insurance policy for a lot less and medication would be at least partially covered.