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Related Experiment Video

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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Relapse patterns after low-dose-rate prostate brachytherapy.

David S Lamb1, Lynne Greig2, Trevor FitzJohn3

  • 1School of Biological Sciences, Victoria University of Wellington, New Zealand; Radiation Oncology, Southern Cross Hospital, Wellington, New Zealand.

Brachytherapy
|November 7, 2020
PubMed
Summary
This summary is machine-generated.

Prostate-specific membrane antigen positron emission tomography -CT (PSMA PET-CT) scanning effectively identifies relapse sites after brachytherapy. This imaging improves understanding of recurrence patterns, guiding better management for prostate cancer patients experiencing biochemical failure.

Keywords:
D90 prostateLow-dose-rate prostate brachytherapyPSMA PET-CT scanningRelapse patterns

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Area of Science:

  • Oncology
  • Radiology
  • Nuclear Medicine

Background:

  • Biochemical failure (BF) after low-dose-rate prostate brachytherapy often lacks identified relapse sites.
  • Understanding recurrence patterns is crucial for effective patient management.

Purpose of the Study:

  • To evaluate if prostate-specific membrane antigen positron emission tomography -CT (PSMA PET-CT) scanning enhances the detection of relapse sites in patients with BF post-prostate brachytherapy.
  • To assess the impact of PSMA PET-CT on understanding prostate cancer recurrence patterns.

Main Methods:

  • Analysis of a database of 903 men treated with iodine-125 seed implant monotherapy for early-stage prostate cancer.
  • Comparison of relapse site identification in 38 men before PSMA PET-CT availability versus 30 men with recent PSMA PET-CT scans.
  • Review of radiation dosimetry to the prostate base in identified relapse cases.

Main Results:

  • Before PSMA PET-CT, relapse sites were unknown in 20 of 38 men (53%).
  • With PSMA PET-CT, relapse sites were identified in all 30 men, with 19 (63%) showing recurrence at the prostate base.
  • Lower radiation doses were delivered to the prostate base compared to the rest of the prostate.

Conclusions:

  • PSMA PET-CT scanning significantly improves the identification of relapse sites in patients with biochemical failure after prostate brachytherapy.
  • Accurate localization of recurrence increases management options for patients.
  • Findings suggest potential underdosing of the prostate base with standard brachytherapy implants.