Prostate Cancer Diagnosis and Risk Stratification

Introduction to PSA Values

The American College of Physicians and the National Comprehensive Cancer Network recommend that a PSA value greater than 10 ng/mL confers a greater than 67% likelihood of prostate cancer, while a PSA value of 0-2 ng/mL carries only a 1% probability of cancer 1

The probability of prostate cancer increases progressively with PSA elevation, with a PSA value of 0-2 ng/mL associated with a 1% probability of prostate cancer, as recommended by the European Association of Urology 2, 3
A PSA value of 4-10 ng/mL is associated with a 30-35% likelihood of cancer, according to the National Comprehensive Cancer Network 5, 1, 6
A PSA value greater than 10 ng/mL is associated with a greater than 67% likelihood of prostate cancer, as stated by the American Urological Association 1

The National Comprehensive Cancer Network recommends that a free PSA percentage less than 10% is associated with a high risk for prostate cancer, and biopsy is strongly recommended 5, 1
A free PSA percentage of 10-25% is associated with an intermediate risk, with a negative linear relationship to cancer probability, as suggested by the European Association of Urology 7

The National Comprehensive Cancer Network recommends that a Phi (Prostate Health Index) value greater than 35 may be informative for high-grade cancer probability 5, 1
A 4Kscore provides an estimate of high-grade prostate cancer probability, as stated by the American Urological Association 5, 1

The American College of Physicians recommends that 5α-reductase inhibitors reduce PSA by approximately 50% after 6-12 months of therapy, and measured PSA should be multiplied by 2 in men taking these medications to determine true PSA value 8

The National Comprehensive Cancer Network suggests that a PSA velocity greater than 0.75 ng/mL per year is suspicious for cancer, especially when baseline PSA is less than 4 ng/mL 7
A PSA velocity greater than 2.0 ng/mL per year in the year before diagnosis is associated with approximately a 10-fold greater risk of death from prostate cancer after radical prostatectomy, as reported by the European Association of Urology 4

For a PSA value of 0-2 ng/mL, the European Association of Urology recommends repeat testing at 2-4 year intervals, with a cancer probability of 1% 2, 3, 1
For a PSA value of 4-10 ng/mL, the National Comprehensive Cancer Network recommends measuring free PSA percentage, and if free PSA is less than 10%, proceeding to biopsy 5, 1
For a PSA value greater than 10 ng/mL, the American Urological Association recommends proceeding directly to prostate biopsy, with a cancer probability greater than 50-67% 2, 3, 1