title: Prostate specific antigen bounce phenomenon after external beam radiation for clinically localized prostate cancer.
abstract: OBJECTIVE
  We characterize the prostate-specific antigen (PSA) bounce in patients who underwent external beam radiation therapy for prostate cancer and correlate the PSA bounce with the development of biochemical disease progression.
  
  
  METHODS
  In this study 964 patients received full dose radiation therapy alone. Followup PSA values were obtained 3 months after completion of radiotherapy and every 3 to 6 months thereafter. Median followup of the entire study group was 48 months. All time intervals were calculated from the completion date of radiation therapy. PSA bounce was defined as an initial increase in serum PSA of at least 0.5 ng./ml., followed by a decrease to pre-bounce baseline serum PSA values no more than 60 months after external beam radiation therapy.
  
  
  RESULTS
  Of the 964 patients 119 (12%) had a PSA bounce. PSA bounce was unrelated to age, race, pretreatment PSA, Gleason score, clinical T stage or radiation dose. Mean time to PSA bounce was 9 months from the time of therapy. The respective 1 and 5-year biochemical disease-free survival rates were 100% and 82.1% for patients with PSA bounce and 93.9% and 57.7% for those without PSA bounce (p = 0.0001).
  
  
  CONCLUSIONS
  Of men with prostate cancer treated with external beam radiation therapy 12% experienced a transient increase in PSA (PSA bounce) followed by a return to pre-bounce levels after radiation. The PSA bounce phenomenon was not predictive of time to biochemical recurrence.
authors.affiliation: Department of Urology, The University of Texas, M.D. Anderson Cancer Center, Houston 77030, USA.
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Rosser
authors.forename: Deborah A
authors.initials: DA
authors.lastname: Kuban
authors.forename: Lawrence B
authors.initials: LB
authors.lastname: Levy
authors.forename: Ramsey
authors.initials: R
authors.lastname: Chichakli
authors.forename: Alan
authors.initials: A
authors.lastname: Pollack
authors.forename: Andrew K
authors.initials: AK
authors.lastname: Lee
authors.forename: Louis L
authors.initials: LL
authors.lastname: Pisters
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000097:blood*; D018450:Disease Progression; D018572:Disease-Free Survival; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D017430:Prostate-Specific Antigen / Q000097:blood*; D011471:Prostatic Neoplasms / Q000097:blood / Q000401:mortality / Q000532:radiotherapy*; D011880:Radiotherapy Planning, Computer-Assisted; D020266:Radiotherapy, Conformal
chemical_list: D014408:Biomarkers, Tumor; D017430:Prostate-Specific Antigen