Thanks to a comment by Tall_Allen I've been doing some research on Cabergoline (trade name: dostinex). Here is a one-off case:
I can find no clinical trails in the USA involving this drug. And it's not considered well-established therapy for PCa. Yet for this one guy Cabergoline helped when Lu-177 failed him. Is anyone using this drug in combination with first or second-line ADT? BTW I don't pay attention to the life expectancy numbers in articles like this. It's nonsense, IMHO.