When Zytiga fails, replacing prednisone with dexamethesone has given more months where Zytiga counters the PCa. I was told this by one of the brothers who did this action. I think Dan or Greg stated that fact. Was the dosage 0.75 milligrams twice a day?
PS: Zytiga is working for me; however, I like to look down the road; so that, I have options.