Gleason Score 9, Small Prostate

Hi,
My Dad was recently diagnosed with prostate cancer.  He had a biopsy done, and his Gleason score is 9.  His PSA score is 4.  The urologist states that his prostate is small.  There is no family history of prostate cancer, and my Dad is 63 years old.  He goes for a CT scan on December 21st.  Why is the PSA level so low with such a high Gleason score?  The doctor is going to remove his prostate only if the cancer has not spread to the lymph nodes.  What is the life expectancy rates of patients with this type of condition?

Thank you,
Heidi


This discussion is related to Biopsy report for my Dad who is 67 years old.