Prostate Cancer: How to Interpret a Rising PSA Post-treatment

The following is a clinical perspective from Dr. Geo, whose recent book on prostate cancer (Thrive Don’t Only Survive) is available and recommended.
A 63-year-old patient who is one year after prostate cancer surgery recently came to see me at my clinic following his recent diagnosis of recurrence PSA. He looked at me strangely, so I asked him, “What’s wrong?” He responded with “I thought I didn’t have ever to worry about prostate cancer again since I had it taken out. I expected my PSA to be zero forever. I’m confused.”