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External Beam Radiation Therapy - Target Volume

This study has been completed.
Princess Margaret Hospital, Canada
Information provided by (Responsible Party):
University Health Network, Toronto Identifier:
First received: September 28, 2005
Last updated: January 3, 2014
Last verified: January 2014
Delivery of conformal radiation therapy following radical prostatectomy is limited by the inability to define the clinical target volume (CTV). This stems from a poor understanding of patterns of local recurrence and limitations of standard imaging techniques.Magnetic Resonance Imaging (MRI) is a promising modality for imaging the prostatic bed following radical prostatectomy. MRI provides more detailed postoperative anatomy to guide CTV delineation, the ability to document local recurrence patterns, and a method to assess intrafraction prostatic bed motion and deformity to define appropriate planning target volume margins. The aim of this pilot study is to develop a technique for external beam radiation therapy (EBRT) following radical prostatectomy based on MRI-delineation of the CTV. Twenty patients will be enrolled in this pilot, development phase.

Condition Intervention Phase
Prostatic Neoplasms Procedure: External Beam Radiotherapy Phase 2

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: A Pilot Study to Develop a Technique for External Beam Radiotherapy After Radical Prostatectomy Based on MRI-Delineation of the Clinical Target Volume

Resource links provided by NLM:

Further study details as provided by University Health Network, Toronto:

Primary Outcome Measures:
  • To develop a technique for MRI-delineation of the clinical target volume (CTV) for EBRT following radical prostatectomy [ Time Frame: After data acquisition ]

Secondary Outcome Measures:
  • To compare the reproducibility of clinical target volume and rectal wall volume delineation on MRI and CT. [ Time Frame: After data acquisition ]
  • To compare the location of the urethral anastomosis defined on MRI as compared to a fiducial marker placed under TRUS-guidance adjacent to the anastomosis. [ Time Frame: After data acquisition ]
  • To measure the amount of intrafraction movement and deformity of the prostatic bed and seminal vesicles with current bowel regimen of daily milk of magnesia using cinematic MRI. [ Time Frame: After data acquisition ]
  • To determine the optimal radiation technique that encompasses the MRI-defined PTV whilst respecting bowel and bladder dose constraints. [ Time Frame: After data acquisition ]
  • To measure the amount of interfraction movement and deformity of the bladder, rectum, and surgical clips within the operative bed using daily cone-beam CT imaging. [ Time Frame: After data acquisition ]
  • To explore the utility of IV contrast for the delineation of gross tumor recurrence and normal blood vessels. [ Time Frame: After data acquisition ]

Enrollment: 27
Study Start Date: January 2005
Study Completion Date: May 2013
Primary Completion Date: May 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: External Beam Radiation Therapy Procedure: External Beam Radiotherapy


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients following radical prostatectomy for prostate adenocarcinoma with one or more of the following adverse features:

pT2 + positive surgical margins ) pT3 ) PSA ≤ 2ng/ml Persistently elevated PSA at 3 months )

  • Patients with initially undetectable PSA following prostatectomy for prostate adenocarcinoma with subsequent PSA relapse
  • Patients being planned for radiation therapy
  • No evidence of distant metastases
  • Age ≥ 18 years
  • ECOG performance status 0 or 1
  • Informed consent

Exclusion Criteria:

  • Contraindications to MRI Patients weighing >136 kgs (weight limit for the scanner tables) Patients with pacemakers, cerebral aneurysm clips, shrapnel injury or implantable electronic devices not compatible with MRI.
  • Severe claustrophobia
  • Inflammatory bowel disease or collagen vascular disease
  • Previous colorectal surgery
  • Previous pelvic radiotherapy
  Contacts and Locations
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Please refer to this study by its identifier: NCT00230438

Canada, Ontario
Princess Margaret Hospital
Toronto, Ontario, Canada, M5G 2M9
Sponsors and Collaborators
University Health Network, Toronto
Princess Margaret Hospital, Canada
Principal Investigator: Cynthia Menard, MD Princess Margaret Hospital, Canada
  More Information

Responsible Party: University Health Network, Toronto Identifier: NCT00230438     History of Changes
Other Study ID Numbers: UHN REB 04-0759-CE
Study First Received: September 28, 2005
Last Updated: January 3, 2014

Additional relevant MeSH terms:
Prostatic Neoplasms
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Genital Diseases, Male
Prostatic Diseases processed this record on August 16, 2017