Approximately 4 years ago, on routine physical exam, I had PSA value of 5 and was suggested to have biopsy which I did with a finding of cancer cells. However, I chose to use "intelligent watchful waiting". Since then my PSA has varied from as low as 4 to as high as 9, with changes of nearly that magnitude within a weeks time. I have no symptoms of infection or any other condition that would elevate PSA. My question, is there anyone else out there who has these fluctuation in their PSA values?