Here's a summary of what's going on with my father's PSA while on Zytiga.
PSA - Date
3 - 24th May
2.75 - 20th June (-0.25)
3.3 - 19th July (+0.55)
1.92 - 31th August (-1.38)
2.25 - 28th September (+0.33)
2.02 - 28th October (-0.23)
2.10 - 30th November (+0.08)
0.90 - 18th January (-1.20)
0.70 - 8th March (-0.20)
0.46 - 12th April (-0.24)
0.52 - 10th May (+0.06)
Today marks a full year that he started using the drug, latest PSA was taken a few days ago and was 0.52, the drug is still effective fortunately and he is responding very well to it, side effects are there but always bearable (fatigue and hot flashes).
He was originally diagnosed with a G7 (4+3) Adenocarcinoma back in April 2017 and had both RP (failed but I think still helped him greatly) and a lighter version of Docetaxel chemo before starting Zytiga.
He never had bone mets, always lymph nodes.
Best wishes to all the other fighters!