I've been on Zytiga three months today. A month ago my testosterone was undetectable, but the result I got yesterday was 39. (I haven't received the PSA value yet.) My questions run along these lines:
1. Does this indicate that Zytiga is no longer working?
2. If the PSA has also increased (will find out Tuesday), would that indicate castrate resistant PCa?
Would like to hear others experience in similar situations.