title: Long-term outcomes of salvage radiotherapy for PSA-recurrent prostate cancer: validation of the Stephenson nomogram.
abstract: OBJECTIVE
  Approximately one-third of patients who undergo radical prostatectomy for clinically localized prostate cancer will ultimately develop a biochemical recurrence. We report our long-term outcomes of salvage radiotherapy (SRT), and in so doing, validate a recently published prognostic nomogram.
  
  
  METHODS
  A retrospective chart review was performed of all patients treated with SRT following radical prostatectomy for biochemical PSA recurrence at our institution between 1992 and 2003. We calculated the probability of 6-year biochemical progression-free survival following SRT and performed a goodness-of-fit test to ascertain whether the previously published nomogram correctly predicted our observations.
  
  
  RESULTS
  During the study period, 96 patients were treated with SRT. At a median follow-up of 71 months, 44 (46%) had a durable PSA-free response. There was no significant difference between the observed progression-free survival and that predicted by the Stephenson nomogram (P = 0.7). Multivariate logistic regression analysis determined that PSA value at the initiation of SRT (P = 0.02) and pathologic Gleason Score (P = 0.04) were significantly associated with the probability of recurrence.
  
  
  CONCLUSIONS
  During the study period, nearly half of patients treated with SRT for PSA recurrence following radical prostatectomy had a durable treatment response. We found the predictive nomogram developed by Stephenson, et al. to be valid when tested on our independent cohort of patients.
authors.affiliation: Department of Urology, Loyola University Medical Center, Maywood, IL, USA. chugen@lumc.edu
authors.forename: Cory M
authors.initials: CM
authors.lastname: Hugen
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Polcari
authors.forename: Marcus L
authors.initials: ML
authors.lastname: Quek
authors.forename: Richard P
authors.initials: RP
authors.lastname: Garza
authors.forename: Mary P
authors.initials: MP
authors.lastname: Fitzgerald
authors.forename: Robert C
authors.initials: RC
authors.lastname: Flanigan
mesh_terms: D000368:Aged; D000465:Algorithms; D006801:Humans; D053208:Kaplan-Meier Estimate; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000097:blood / Q000175:diagnosis* / Q000532:radiotherapy*; D049451:Nomograms; D011379:Prognosis; D017430:Prostate-Specific Antigen / Q000097:blood; D011468:Prostatectomy; D011471:Prostatic Neoplasms / Q000097:blood / Q000532:radiotherapy* / Q000601:surgery; D011878:Radiotherapy / Q000379:methods*; D015203:Reproducibility of Results; D012189:Retrospective Studies; D016879:Salvage Therapy / Q000379:methods*; D016896:Treatment Outcome
chemical_list: D017430:Prostate-Specific Antigen
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