title: Clinical usefulness of free PSA fraction as an indicator of prostate cancer.
abstract: The usefulness of the fPSA fraction in the differential diagnosis of benign prostate hyperplasia (BPH) and prostate cancer was evaluated, with the aim of improving the diagnostic efficacy of PSA. Serum PSA and fPSA determinations were performed by an enzymoimmunoassay technique on an ES-300 system. fPSA constitutes a minor fraction both in normal subjects and in patients with prostate disease, being significantly lower in patients with untreated prostate cancer than in patients with BPH. Likewise, the authors have observed that the sensitivity of the fPSA/PSA ratio has an inversely proportional relationship with the stage of the disease. The results obtained in patients with PSA levels between 4 and 20 micrograms/l are also of note. In this series of patients, the efficacy of the fPSA/PSA ratio was higher than that of PSA, showing a sensitivity of 44% and a specificity of 95% at the cut-off of 0.08.
authors.affiliation: Department of Clinical Biochemistry (Unit for Cancer Research), Hospital Clínic i Provincial, Barcelona, Spain.
authors.forename: X
authors.initials: X
authors.lastname: Filella
authors.forename: J
authors.initials: J
authors.lastname: Alcover
authors.forename: R
authors.initials: R
authors.lastname: Molina
authors.forename: N
authors.initials: N
authors.lastname: Giménez
authors.forename: A
authors.initials: A
authors.lastname: Rodríguez
authors.forename: J
authors.initials: J
authors.lastname: Jo
authors.forename: P
authors.initials: P
authors.lastname: Carretero
authors.forename: A M
authors.initials: AM
authors.lastname: Ballesta
mesh_terms: D014408:Biomarkers, Tumor / Q000097:blood*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D011230:Precancerous Conditions / Q000097:blood / Q000175:diagnosis*; D011237:Predictive Value of Tests; D017430:Prostate-Specific Antigen / Q000097:blood*; D011471:Prostatic Neoplasms / Q000097:blood / Q000175:diagnosis*
chemical_list: D014408:Biomarkers, Tumor; D017430:Prostate-Specific Antigen