External Beam Radiation Therapy - Target Volume

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00230438
Recruitment Status : Completed
First Posted : September 30, 2005
Last Update Posted : January 6, 2014
Princess Margaret Hospital, Canada
Information provided by (Responsible Party):
University Health Network, Toronto

Brief Summary:
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 or disease Intervention/treatment Phase
Prostatic Neoplasms Procedure: External Beam Radiotherapy Phase 2

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 27 participants
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (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
Study Start Date : January 2005
Actual Primary Completion Date : May 2013
Actual Study Completion Date : May 2013

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Arm Intervention/treatment
Experimental: External Beam Radiation Therapy Procedure: External Beam Radiotherapy

Primary Outcome Measures :
  1. 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 :
  1. To compare the reproducibility of clinical target volume and rectal wall volume delineation on MRI and CT. [ Time Frame: After data acquisition ]
  2. 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 ]
  3. 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 ]
  4. To determine the optimal radiation technique that encompasses the MRI-defined PTV whilst respecting bowel and bladder dose constraints. [ Time Frame: After data acquisition ]
  5. 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 ]
  6. To explore the utility of IV contrast for the delineation of gross tumor recurrence and normal blood vessels. [ Time Frame: After data acquisition ]

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
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

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): 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

Responsible Party: University Health Network, Toronto Identifier: NCT00230438     History of Changes
Other Study ID Numbers: UHN REB 04-0759-CE
First Posted: September 30, 2005    Key Record Dates
Last Update Posted: January 6, 2014
Last Verified: January 2014

Additional relevant MeSH terms:
Prostatic Neoplasms
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Genital Diseases, Male
Prostatic Diseases