Prognosis for Stage 4 Metastatic Prostate Cancer

Good afternoon, and thank you to any one in advance who is reading this and is able to offer any insight/similarities with their journey.

My dad (68 yrs) started experiencing crippling pain in his back this past May, that led to him being almost completely immobile. He was ultimately diagnosed with Stage 4 metastatic/advanced prostate cancer, with metastases to his pelvic and abdominal lymph nodes, as well as to his bones. His Gleason score was 9 at the time of his biopsy, and his PSA level was 800 ng/ml.

For treatment, he has received a total of three shots of Luteinizing hormone–releasing hormone (LHRH) which he will receive indefinitely, is presently taking Darolutamide (Nubeqa), and underwent 6 cycles of chemotherapy (Docetaxel) which he completed in December. They did a round of scans halfway through his chemo and told us that although the cancer seemed to be responding to the treatment (thank goodness!), it was incurable and will eventually find its way around the Darolutamide, hormone therapy and chemo. After chemo my dad's paralyzing pain was reduced to what he described as mild discomfort, which was a huge relief. His PSA settled at 5 ng/ml in the end.

About a week ago, my dad sat me down and said that he did not want to worry me, but admitted that pain seems to be coming back in a way that is progressive and more continuous. He is really worried he is going backwards, but this has not yet been confirmed and for now we are just trying to manage the pain. He has another round of scans (CT, bone scan and blood work) scheduled for next week, and now I am feeling concerned with what they may find.

I am not really sure what to ask, or how to ask, but I am just wondering if there is anyone who can give me some insight on whether they have had a similar experience with pain returning after chemotherapy, and how they managed it.

Finally, my dad's oncologist has been hesitant to offer my dad an honest prognosis, and just keeps saying "it depends". My dad is 68, and does have a history of congestive heart failure (2017), but is healthy otherwise (no diabetes, not overweight, gave up smoking 20 years ago). I know it may potentially be difficult news, but would anyone looking at the information I provided be able to let me know honestly what they think his chances are at living another 5 years or more?

Thank you again, Phil