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Related Experiment Videos

Late Genitourinary Toxicity Outcomes in 300 Prostate Cancer Patients Treated With Dose-escalated Image-guided

K Byrne1, G Hruby1, A Kneebone1

  • 1Department of Radiation Oncology, Northern Sydney Cancer Centre, Royal North Shore Hospital, Sydney, New South Wales, Australia.

Clinical Oncology (Royal College of Radiologists (Great Britain))
|April 19, 2017
PubMed
Summary

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This summary is machine-generated.

Image-guided intensity-modulated radiotherapy (IMRT) for prostate cancer showed acceptable late genitourinary toxicity. Previous transurethral resection of the prostate (TURP) was a significant predictor of toxicity.

Area of Science:

  • Radiation oncology
  • Urologic oncology
  • Prostate cancer treatment

Background:

  • Image-guided intensity-modulated radiotherapy (IMRT) allows for precise dose escalation in prostate cancer.
  • Understanding late genitourinary (GU) toxicity is crucial for optimizing treatment outcomes.

Purpose of the Study:

  • To quantify and qualify late GU toxicity in patients with localized prostate cancer treated with dose-escalated IMRT (≥78 Gy).
  • To identify predictors of late urinary toxicity in this cohort.

Main Methods:

  • A cohort of 300 patients receiving definitive dose-escalated IMRT (78-84 Gy) was analyzed.
  • International Prostate Symptoms Score (IPSS) and toxicity data were collected prospectively.
  • Kaplan-Meier curves and univariate/multivariate analyses were used to assess toxicity and identify predictors.
Keywords:
Genitourinarylate toxicityurinary

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Main Results:

  • The 3-year cumulative incidence of grade ≥2 GU toxicity was 14.9%, and grade 3 toxicity was 2.8%.
  • Previous transurethral resection of the prostate (TURP) was the only significant predictor of late ≥2 GU toxicity on multivariate analysis (HR 2.54, P=0.002).
  • Other factors associated with toxicity on univariate analysis included alpha blocker use, hormone use, baseline IPSS ≥14, and pre-existing urinary dysfunction.

Conclusions:

  • Dose-escalated IMRT (78-84 Gy) for prostate cancer demonstrated acceptable late GU toxicity rates.
  • Previous TURP is a significant risk factor for developing late GU toxicity after IMRT.
  • Pre-existing urinary symptoms and certain medication use may also contribute to toxicity.