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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Magnetic Resonance Imaging-guided Focal Boost to Intraprostatic Lesions Using External Beam Radiotherapy for

Darren M C Poon1, Jing Yuan2, Bin Yang3

  • 1Comprehensive Oncology Centre, Hong Kong Sanatorium & Hospital, Happy Valley, Hong Kong Special Administrative Region.

European Urology Oncology
|December 22, 2025
PubMed
Summary
This summary is machine-generated.

Magnetic resonance imaging (MRI)-guided external beam radiotherapy (EBRT) focal boost to intraprostatic lesions (IPLs) is a safe and effective treatment for localized prostate cancer (PC). This approach offers favorable biochemical disease-free survival (bDFS) with low toxicity compared to traditional methods.

Keywords:
Focal boostIntraprostatic lesionLocalized prostate cancerMagnetic resonance imaging

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Area of Science:

  • Oncology
  • Radiotherapy
  • Medical Imaging

Background:

  • External beam radiotherapy (EBRT) with a focal boost to intraprostatic lesions (IPLs) guided by magnetic resonance imaging (MRI) is hypothesized to improve biochemical disease-free survival (bDFS) in localized prostate cancer (PC) without increasing toxicity.
  • The study aims to systematically review clinical outcomes of this specific treatment approach.

Purpose of the Study:

  • To systematically review clinical outcomes for MRI-guided EBRT focal boost to IPLs in localized prostate cancer.
  • To evaluate the safety, toxicity, quality of life, and biochemical disease outcomes of this treatment modality.

Main Methods:

  • A systematic literature search was conducted in three databases following PRISMA guidelines.
  • Included were prospective English-language studies (2000-2021) of localized PC patients receiving MRI-guided EBRT focal boost to IPLs (n > 10).
  • Meta-analyses were performed to assess safety, GI/GU toxicities, quality of life, and bDFS, with heterogeneity assessed using I² statistic and publication bias via funnel plots.

Main Results:

  • Seventeen studies involving 1290 patients were analyzed, showing heterogeneity in risk categories, MRI use, and treatment planning.
  • The treatment demonstrated good safety with low rates of acute/late grade ≥2 GI toxicities (7.5%/7.0%) and GU toxicities (29.5%/16.0%).
  • Biochemical disease-free survival (bDFS) was favorable, with an overall rate of 95.0% (95% CI 91.9-97.4%) and 92.4% (95% CI 84.5-97.7%) for follow-up >5 years.

Conclusions:

  • MRI-guided EBRT focal boost to IPLs is a feasible and safe treatment for localized PC, associated with low GI/GU toxicities and favorable biochemical outcomes.
  • Level 1 evidence supports superior bDFS compared to whole-prostate irradiation in standard fractionation.
  • Further research is needed for hypofractionation and ultra-hypofractionation regimens.