However, the PSA rate of rise may have value in prostate cancer prognosis. Men with prostate cancer whose PSA level increased by more than 2.0ng per milliliter during the year before the diagnosis of prostate cancer have a higher risk of death from prostate cancer despite undergoing radical prostatectomy. PSA velocity (PSAV) was found in a 2008 study to be more useful than the PSA doubling time (PSA DT) to help identify those men with life-threatening disease before start of treatment.