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Safety of Prostate Stereotactic Body Radiation Therapy after Transurethral Resection of Prostate (TURP): A Propensity Score Matched Pair Analysis.

PURPOSE: To determine the genitourinary (GU) toxicity outcomes in prostate cancer patients treated with stereotactic body radiation therapy (SBRT) who have undergone a prior transurethral resection of prostate (TURP) and compare it to a similar non-TURP cohort.

MATERIALS AND METHODS: Fifty prostate cancer patients who had undergone a single TURP, had a good baseline urinary function, and had been subsequently treated with SBRT were chosen from a prospectively maintained database. These were propensity score matched to a similar non-TURP cohort treated during the same period. Matching was done for diabetes mellitus and volume of radiation therapy. Acute GU and late GU toxicity were scored using the Radiation Therapy Oncology Group (RTOG) criteria. Stricture and incontinence were scored using Common Terminology for Common Adverse Events version 4.0.

RESULTS: Median follow-up for the entire cohort was 26 months (non-TURP vs TURP, 30 months vs 22 months, P = .34). The median duration between TURP and start of SBRT was 10 months. There was no significant difference between non-TURP versus TURP cohort in terms of RTOG acute GU toxicities grade ≥2 (8% vs 6%, P = .45), RTOG late GU toxicities grade ≥2 (8% vs 12%, P = .10), stricture rates (4% vs 6%, P = .64), and incontinence rates (0% vs 4%, P = .15). The median duration of time to late toxicity was 16 months vs 10 months (P = .12) in non-TURP and TURP cohort, respectively.

CONCLUSIONS: Although modestly increased as compared with non-TURP patients, GU toxicities remains low with SBRT in post-TURP patients. SBRT can be safely performed in carefully selected post-TURP prostate cancer patients.

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