After hours amd hours of reading about the rise in PSA post a Radical Prostatectomy, not one article or person has explained why 0.1 or 0.2 is (or three consecutive rises within a within a specified period) is considered biological recurrence. Is it simply it's a nice round number or it was the threshold prior to the introduction of ultra sensitive PSA test ? How many who test 0.06 thru 0.09 don't progress to recurrence? Evidence?
Anyone care to tackle this one?