High PSA Low WBC

I'm 58 and have been dealing with PC for 6 years and now have a psa of 75 and wbc at 3.0. Last Feb. the psa was 12 and wbc was 6.5. I know about all the available treatments and only want to know why or if the two numbers are related and from someone who has personally been in this situation. I am all about quality of life and getting as much of it as possible without losing the ability to enjoy life every day. If you have good knowledge of this please let me know and thank you very much.