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Seed migration in prostate brachytherapy depends on experience and technique
Daniel Taussky1, Camille Moumdjian, Renée Larouche
1Department of Radiation Oncology, Centre hospitalier de l'Université de Montréal, Hôpital Notre-Dame, Montréal, Québec, Canada. daniel.taussky.chum@ssss.gouv.qc.ca
Brachytherapy
|May 1, 2012
Summary
A learning curve exists for seed migration in permanent seed prostate brachytherapy, with rates decreasing over time. Improved techniques significantly reduce seed loss and pulmonary migration.
Area of Science:
- Urology
- Radiation Oncology
- Medical Physics
Background:
- Permanent seed prostate brachytherapy is a common treatment for localized prostate cancer.
- Understanding and minimizing seed migration is crucial for treatment efficacy and patient safety.
Purpose of the Study:
- To evaluate the temporal changes in seed loss and pulmonary migration rates following permanent seed prostate brachytherapy.
- To identify factors influencing seed migration during the learning curve of this procedure.
Main Methods:
- Analysis of data from the first 495 patients treated with loose Iodine-125 seeds using an automated delivery system and real-time planning.
- Pelvic fluoroscopic imaging at 30 days post-implant to assess seed migration.
- Statistical comparison of seed loss rates across patient groups based on treatment order.
Main Results:
- Overall seed loss was observed in 22.8% of patients, with the highest incidence in the first 100 patients (38%) and a significant decline to 9% in the last 100 patients.
- The mean total seed loss rate decreased significantly over time (p<0.001), from 1.25% in the first 100 patients to 0.21% in the final group.
- Pulmonary migration rate also changed significantly over time (p=0.009), initially rising and then declining to 0.21% in the last 100 patients.
Conclusions:
- A distinct learning curve was identified for seed migration in prostate brachytherapy.
- Implementing techniques to avoid extra-capsular seed implantation and utilizing modern transrectal ultrasound imaging can effectively reduce seed migration.
