title: The proportional decrease in prostate specific antigen level best predicts the duration of survival after hormonal therapy in patients with metastatic carcinoma of the prostate.
abstract: OBJECTIVE
  To examine the usefulness of a test for prostate specific antigen (PSA) to predict survival in hormonally treated patients with metastatic prostate cancer.
  
  
  METHODS
  The study comprised 49 patients (mean age 72 years, SD 6) who underwent orchidectomy for metastatic prostate cancer. PSA was measured before orchidectomy and after 6 months, and the absolute, differential and proportional decreases calculated. A Cox proportional hazards regression model, which controlled for patient age, tumour (Gleason) grade and the number of skeletal metastases, was then used to evaluate these estimates of PSA as predictors of survival.
  
  
  RESULTS
  The 6-month proportional decrease in PSA from the pre-operative level was the most accurate predictor of patient survival (P = 0.006) after hormonal therapy for metastatic prostate cancer.
  
  
  CONCLUSIONS
  This information may help to direct appropriate patients to new and experimental therapies for metastatic disease.
authors.affiliation: Department of Urology, University of Florida, Gainesville, USA.
authors.forename: C P
authors.initials: CP
authors.lastname: Evans
authors.forename: V
authors.initials: V
authors.lastname: Gajendran
authors.forename: A
authors.initials: A
authors.lastname: Tewari
authors.forename: K
authors.initials: K
authors.lastname: Aslam
authors.forename: R
authors.initials: R
authors.lastname: Juster
authors.forename: S
authors.initials: S
authors.lastname: Gange
authors.forename: A
authors.initials: A
authors.lastname: Eason
authors.forename: P
authors.initials: P
authors.lastname: Narayan
mesh_terms: D000368:Aged; D018931:Antineoplastic Agents, Hormonal / Q000627:therapeutic use*; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary*; D018572:Disease-Free Survival; D006801:Humans; D008297:Male; D009919:Orchiectomy; D011182:Postoperative Care; D011300:Preoperative Care; D016016:Proportional Hazards Models; D017430:Prostate-Specific Antigen / Q000097:blood*; D011471:Prostatic Neoplasms / Q000097:blood / Q000601:surgery*; D011877:Radionuclide Imaging; D016019:Survival Analysis
chemical_list: D018931:Antineoplastic Agents, Hormonal; D017430:Prostate-Specific Antigen