Clinical Outcome of Salvage Radiotherapy for Locoregional Clinical Recurrence After Radical Prostatectomy.

Abstract

Objectives: To assess the clinical outcomes of prostate cancer patients treated with salvage radiotherapy (SRT) for locoregional clinical recurrence (CR) after radical prostatectomy (RP). Methods: Records of 60 patients with macroscopic locoregional recurrence after prostatectomy and referrals for SRT were retrospectively investigated in the multi-institutional database. The median radiation dose was 70.2 Gy. Biochemical failure was defined as the prostate-specific antigen (PSA) ≥ nadir + 2 or initiation of androgen deprivation therapy (ADT) for increased PSA. Results: Median recurrent tumor size was 1.1 cm and pre-radiotherapy PSA level was 0.4 ng/ml. At a median follow-up of 83.1-month after SRT, 7-year biochemical failure-free survival (BCFFS), locoregional failure-free survival (LRFFS), distant metastasis-free survival (DMFS), and overall survival (OS) were 67.0%, 89.7%, 83.6%, and 91.2%, respectively. Higher Gleason's scores were associated with unfavorable BCFFS, DMFS, and OS. Pre-SRT PSA ≥0.5 ng/ml predicted worse BCFFS, LRFFS, and DMFS. In multivariate analyses, a Gleason's score of 8 to 10 was associated with decreased BCFFS (hazard ratio [HR] 3.12, 95% confidence interval [CI] 1.11-8.74, P = .031) and OS (HR 17.72, 95% CI 1.75-179.64, P = .015), and combined ADT decreased the risks of distant metastasis (HR 0.18, 95% CI 0.04-0.92, P = .039). Two patients (3.3%) experienced late grade 3 urinary toxicity. Conclusions: SRT for locoregional CR after RP achieved favorable outcomes with acceptable long-term toxicities. Higher Gleason's scores and pre-radiotherapy PSA level were unfavorable prognostic variables. Combined ADT may decrease the risks of metastases.

• Authors: Sung Uk Lee, Kwan Ho Cho, Jin Ho Kim, Young Seok Kim, Taek-Keun Nam, Jae-Sung Kim, Jaeho Cho, Seo Hee Choi, Su Jung Shim, Jin Hee Kim, Ah Ram Chang
• Journal: Technology in cancer research & treatment (Technol Cancer Res Treat) 2021 Jan-Dec Vol. 20 Pg. 15330338211041212 ISSN: 1533-0338 [Electronic] United States
• PMID: 34806469 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Androgen Antagonists
• Prostate-Specific Antigen

Topics

• Aged
• Androgen Antagonists (therapeutic use)
• Combined Modality Therapy
• Humans
• Kaplan-Meier Estimate
• Male
• Middle Aged
• Neoplasm Grading
• Neoplasm Metastasis
• Neoplasm Recurrence, Local (blood, drug therapy, radiotherapy)
• Prostate-Specific Antigen (blood)
• Prostatectomy
• Prostatic Neoplasms (blood, pathology, therapy)
• Radiotherapy, Intensity-Modulated (adverse effects)
• Retrospective Studies
• Salvage Therapy
• Survival Rate