Positioning and Tracking the Prostate During External Beam Radiation

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: NCT00123838
Recruitment Status : Completed
First Posted : July 26, 2005
Last Update Posted : April 28, 2016
Information provided by (Responsible Party):
Varian Medical

July 22, 2005
July 26, 2005
April 28, 2016
July 2005
September 2008   (Final data collection date for primary outcome measure)
Radiographic verification of at least five of approximately 40 radiation treatment days [ Time Frame: 8 weeks ]
  • Radiographic verification of at five of approximately 40 radiation treatment days.
  • Adverse events check and International Prostate Symptom Score (IPSS) at baseline, at 7 times during treatment, and 6 and 12 months post treatment
Complete list of historical versions of study NCT00123838 on Archive Site
Patient Preference Questionnaire and SF 36 Health Survey at five radiation treatment days [ Time Frame: 8 week ]
Patient Preference Questionnaire and SF 36 Health Survey at five radiation treatment days.
Not Provided
Not Provided
Positioning and Tracking the Prostate During External Beam Radiation
Beacon® Transponder Implantation and Localization in the Prostate
The purpose of this study is to evaluate a non-ionizing electromagnetic method to align the prostate treatment site for radiation therapy and to monitor its position throughout radiation therapy delivery. The clinical study involves using an investigational device, the Calypso® 4D Localization System, and requires permanent implantation of three small sensors called Beacon® transponders in the prostate.

The goal for prostate radiation therapy is to give a high dose of radiation to the prostate and a minimal dose to the healthy tissue around the prostate. It is well known that the prostate moves slightly within the pelvis and that its position varies a few millimeters from day to day. There are several methods used to position the body and the prostate accurately at the beginning of each radiation therapy session.

One of the standard methods is to permanently implant small markers (gold spheres or cylinders) in the prostate and use x-rays in the radiation therapy treatment room to determine whether the markers are in the correct position. If the markers are in the correct position, then the assumption is that the prostate also is in the correct position. If the markers are not in the correct position on the x-ray, then the table that the patient lies on can be shifted so that the markers are in the right place.

In this study the Beacon® transponder will be used in place of the standard gold marker. During the radiation therapy visits, the patient position in the treatment room will be corrected using the Beacon transponder with an investigational system, called the Calypso® 4D Localization System. The Calypso system consists of a flat panel, placed over the pelvis and connected to a computer, which monitors the position of the Beacon transponders within the prostate. During five radiation therapy appointments and one extra visit, the position of the markers in the prostate will be confirmed with x-rays.

The Beacon transponder is a small glass cylinder that contains a tiny electrical circuit. The glass vial is completely sealed and separates the internal components (i.e., the electrical circuit) from the rest of the body. The glass vial is approximately one-third of one inch long and one-tenth of one inch in diameter. Three Beacon transponders will be implanted in the prostate. They will be permanently implanted.

Not Applicable
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Prostate Cancer
Device: Calypso® 4D Localization System
Localization of prostate irradiation.
Experimental: Single Group Assignment
Calypso® 4D Localization System
Intervention: Device: Calypso® 4D Localization System
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
September 2008
September 2008   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • 18 years of age or older
  • Histologically confirmed diagnosis of prostate cancer
  • Intact prostate (minor transurethral resection of the prostate [TURP] defects are allowed at the discretion of the investigator)
  • Ability to comply with study visit schedule

Exclusion Criteria:

  • Prior treatment for prostate cancer.
  • Prostate cancer stage IV (metastatic disease).
  • Patients who are not eligible for prostate biopsy.
  • Past history of abdominoperineal (A-P) resection.
  • Planned course of treatment using brachytherapy (permanent brachytherapy seeds or high dose rate [HDR] brachytherapy).
  • Allergy to local anesthetics.
  • Patients with any permanently implanted medical devices that have an energy source, such as pacemakers, defibrillators, neurostimulators, and drug infusion pumps; this also includes prosthetic implants in the abdomen or pelvis, such as an artificial hip; or vascular implants such as arterial stents or stent-grafts for aortic aneurysms. This does not include surgical clips, staples or coronary stents.
  • History of chronic prostatitis.
  • Patients with a history of recent acute and/or chronic bleeding disorders.
  • Patients on therapeutic anti-coagulants or anti-platelet therapy, not including aspirin.
  • Patients for which the maximum anterior-posterior separation through the torso minus the height of the center of the prostate is greater than 23 cm. (Measurements will be made visually with a ruler.)
  • Baseline evaluation shows an INR or PTT outside of the normal range for the institution; platelet count < 75,000 mm3; or creatinine > 2.0 mg/dl.
  • Any other medical condition or laboratory value that would, at the discretion of the investigator, preclude the patient from participation in a clinical trial
Sexes Eligible for Study: Male
18 Years and older   (Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
United States
Prostate Stage 3
Not Provided
Plan to Share IPD: No
Varian Medical
Varian Medical
Not Provided
Study Director: Lisa Levine, Ph.D. Varian Medical
Varian Medical
April 2016

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP