Interval to Biochemical Failure Highly Prognostic for Distant Metastasis and Prostate Cancer-Specific Mortality After Radiotherapy

Mark K. Buyyounouski, Alexandra L. Hanlon, Eric M. Horwitz, Alan Pollack

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

Purpose: Few biochemical parameters have been related to mortality. The present study examined the clinical utility of the interval to biochemical failure (IBF) as a prognostic factor for distant metastasis (DM) and prostate cancer-specific mortality (PCSM) after radiotherapy. Methods and Materials: The study group consisted of 211 T1c-T3Nx-N0M0 patients who had experienced BF among 1,174 men treated with three-dimensional conformal radiotherapy alone. Biochemical failure was defined as a post-treatment prostate-specific antigen (PSA) level of at, or greater than, the PSA nadir plus 2 ng/mL. Cox proportional hazards modeling was used to identify independent predictors of DM and PCSM on multivariate analysis. Results: An IBF of <18 months was independently predictive for DM (p = 0.008), as was a Gleason score of 7-10 (p = 0.0005), PSA nadir ≥2 ng/mL (p = 0.04), and decreasing radiation dose (p = 0.02) on multivariate analysis, including increasing pretreatment PSA level, PSA nadir ≥2.5 ng/mL, PSA doubling time of <3 months, and Stage T3 disease. An IBF of <18 months was the only predictor of PCSM (p = 0.0003) in the same model. The actuarial 5-year DM rate for an IBF of <18 vs. ≥18 months was 52% vs. 20% (p < 0.0001), and the actuarial PCSM rate was 36% vs. 6%, respectively (p = 0.0001). Conclusions: The IBF is an important descriptor of the PSA kinetics after radiotherapy to identify men at high risk of clinical failure and death. A IBF of <18 months could aid in selecting men for early, aggressive salvage therapy or participation in a clinical trial.

Original languageEnglish (US)
Pages (from-to)59-66
Number of pages8
JournalInternational Journal of Radiation Oncology Biology Physics
Volume70
Issue number1
DOIs
StatePublished - Jan 1 2008
Externally publishedYes

Keywords

  • Prognostic factor
  • Prostate cancer
  • Prostate-specific antigen
  • Radiotherapy
  • Treatment failure

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiation

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