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It is unusual to have no trend with PSA like that at this point in your treatment. I have heard of this happening 5 to 10 years after treatment. My guess is that the PSA is coming from the dying prostate cancer cells. I suspect that a trend will develop in the next few years (good or bad) but you are down to low PSA values now so that is good and it was a very good decision to get the adjuvant treatment. The other sites for PSA do not really produce any significant PSA even with the ultra-sensitive test.
Thank you for your response. My PSA history continues to be confusing, but I take comfort in the trends both prior to adjuvant therapy and now. I find myself wishing there were more extensive nationwide and worldwide data bases tracking more detailed analysis of PCa to address these issues.
One new trend that will help you in the future is the "liquid biopsy" which is a blood sample that is tested for stray DNA strands in your blood from cancer cells that have recently died. ( this is actually being done now in at least one cancer center I know of) They can test the PC DNA and determine how aggressive it is, any drugs that are effective against it and if the PC is likely to be lethal.