Prevalence and clinical significance of prostate cancer among 12,682 men with normal digital rectal examination, low PSA levels (< or =4 ng/ml) and percent free PSA cutoff values of 15 and 20%.

AIM: To report prevalence and clinical relevance of T1c prostate cancers (PCa) in a selected population of men with serum prostate-specific antigen (PSA) levels < or =4 ng/ml enrolled in a multicenter case-finding protocol. PATIENTS AND METHODS: A number of 16,298 men, aged 40-75 years, from the urology units they had been referred to, in most cases (81.6%) for lower urinary tract symptoms, were evaluated. Eighty percent of them had PSA < or =4 ng/ml and about 40% PSA < or =2.5 ng/ml. Patients with PSA < or =2.5 ng/ml and PSA between 2.6 and 4 ng/ml and with percent free PSA < or =15 and < or =20%, respectively, were eligible for biopsy; 28 patients refused it, and 11 patients were excluded from the study because of an abnormal digital rectal examination. Among 403 biopsied men, 82 had PSA < or =2.5 ng/ml (group A) and 321 PSA between 2.6 and 4 ng/ml (group B).
RESULTS: A PCa was found in 109 cases (27.0%): 21 in group A and 88 in group B. 48 (44%) of the 109 patients with a PCa underwent radical prostatectomy: all cancers had a volume >0.5 cm(3), and 41% had a final Gleason sum > or =7; the PCa was organ confined in 34 patients (70.8%) and locally advanced in 14 patients (29.1%), and in 12 patients (25%) positive surgical margins were found.
CONCLUSIONS: Using percent free PSA thresholds of 15 and 20%, 25.6% of the men with PSA < or =2.5 ng/ml and 27.4% of the men with PSA between 2.6 and 4 ng/ml were found to have a PCa, respectively. Most of these cancers, when submitted to radical prostatectomy, were found to be clinically significant. As these cancers are mostly organ confined, these patients are ideal candidates for curative nerve-sparing surgery.