Editorial comment: The value of percentage free prostate specific antigen (PSA) in the detection of prostate cancer among patients with intermediate levels of total PSA (4.0–10.0 ng/mL) in Nigeria

The value of percentage free prostate specific antigen (PSA) in the detection of prostate cancer among patients with intermediate levels of total PSA (4.0–10.0 ng/mL) in Nigeria (4.0–10 ng/mL) for detecting prostate cancer. The pros- tate biopsy was taken using a digitally directed six-core technique and correlated with the % fPSA level. Pros tate cancer was detected in 14 patients (13%) and all of them had a % fPSA of 40%. However, six of the patients with a % fPSA level of 40% had no cancer. The authors concluded that the best threshold for % fPSA in the studied population was 40%, with a sen- sitivity of 100%, specificity of 93.4% and a positive pre- dictive value of 70%.