Salvage Radiotherapy for Recurrent Prostate Cancer: Can the Prognostic Grade Group System Inform Treatment Timing?

Kae Jack Tay, Thomas J. Polascik, Lauren E. Howard, Joseph K. Salama, Ariel A. Schulman, Zinan Chen, Christopher L. Amling, William J. Aronson, Matthew R. Cooperberg, Christopher J. Kane, Martha Kennedy Terris, Stephen J. Freedland

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: In order to better time salvage radiotherapy (SRT) for post–radical prostatectomy biochemical failure, we examined the association between pre-SRT prostate-specific antigen (PSA) and PSA control as a function of the new prognostic grade group (PGG) system. Patients and Methods: Using the Shared Equal Access Regional Cancer Hospital database, we identified men after radical prostatectomy with PSA > 0.2 ng/mL and without cancer involvement of lymph nodes who underwent SRT alone. SRT failure was defined as post-SRT PSA nadir + 0.2 ng/mL or receipt of post-SRT hormone therapy. Men were stratified by pre-SRT PSA (0.2-0.49, 0.5-0.99, and ≥ 1.0 ng/mL). Multivariable Cox models were used to test the association between pre-SRT PSA and SRT failure, stratified by PGG. Results: A total of 358 men met the inclusion criteria and comprised our study cohort. Median post-SRT follow-up was 78 months. A total of 174 men (49%) had pre-SRT PSA 0.2-0.49 ng/mL, 97 (27%) PSA 0.5-0.99 ng/mL, and 87 (24%) PSA ≥ 1.0 ng/mL. On multivariable analysis among men with PGG 1-2, pre-SRT PSA 0.2-0.49 ng/mL had similar outcomes as PSA 0.5-0.99 ng/mL; those with PSA ≥ 1.0 ng/mL had higher recurrence risks (hazard ratio = 2.78, P <. 001). Among PGG 3-5, PSA 0.5-0.99 ng/mL or ≥ 1.0 ng/mL had a higher recurrence risk (hazard ratio = 2.15, P =. 021; and hazard ratio = 2.49, P =. 010, respectively) versus PSA 0.2-0.49 ng/mL. Conclusion: In men with higher-grade prostate cancer (PGG 3-5), SRT should be provided earlier (PSA < 0.5 ng/mL), while among men with lower-grade disease (PGG 1-2), SRT results in equal PSA control up to PSA 1.0 ng/mL.

Original languageEnglish (US)
Pages (from-to)e930-e938
JournalClinical Genitourinary Cancer
Volume17
Issue number5
DOIs
StatePublished - Oct 2019

Keywords

  • Biochemical recurrence
  • Gleason
  • Radical prostatectomy
  • Sequence
  • Survival

ASJC Scopus subject areas

  • Oncology
  • Urology

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