Prostate-specific antigen nadir and cancer-specific mortality following hormonal therapy for prostate-specific antigen failure.

Published

Journal Article

PURPOSE: For men receiving androgen-suppression therapy (AST) for a rising postoperative or postradiation prostate-specific antigen (PSA), we evaluated whether a PSA nadir of more than 0.2 ng/mL was significantly associated with prostate cancer-specific mortality (PCSM). PATIENTS AND METHODS: The study cohort comprised 747 men with rising PSA and negative bone scan after surgery (n = 486) or radiation therapy (n = 261) who were treated with AST. Cox regression was used to evaluate whether a significant association existed between the PSA nadir level after 8 months of AST and the time to PCSM, controlling for treatment and known prognostic factors. RESULTS: The post-AST PSA nadir (pCox < .0001), the pre-AST PSA doubling time (DT) (pCox = .002), PSA level (P = .0001), and Gleason eight to 10 cancers (pCox = .01) were significantly associated with time to PCSM. The adjusted hazard ratio for PCSM was 20 (95% CI, 7 to 61; pCox < .0001), for men with a PSA nadir of more than 0.2 ng/mL as compared with all others. A PSA DT of less than 3 months was observed in 30% (224 of 747) of the study cohort. Of the 28 observed prostate cancer deaths, 21 (75%) occurred in men whose PSA nadir was more than 0.2 ng/mL and who had a PSA DT of less than 3 months. CONCLUSION: A PSA nadir of more than 0.2 ng/mL after 8 months of AST given for postoperative or postradiation PSA failure is significantly associated with PCSM and is clinically significant because it accounted for 75% of the cancer deaths observed in this study.

Full Text

Duke Authors

Cited Authors

  • Stewart, AJ; Scher, HI; Chen, M-H; McLeod, DG; Carroll, PR; Moul, JW; D'Amico, AV

Published Date

  • September 20, 2005

Published In

Volume / Issue

  • 23 / 27

Start / End Page

  • 6556 - 6560

PubMed ID

  • 16170163

Pubmed Central ID

  • 16170163

International Standard Serial Number (ISSN)

  • 0732-183X

Digital Object Identifier (DOI)

  • 10.1200/JCO.2005.20.966

Language

  • eng

Conference Location

  • United States