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Radiation Therapy Positioning System (RTPS)

Philip MP Poortmans, MD, PhD

Willy JM de Kruijf, PhD

Karin Haustermans, MD

The study aims to evaluate the safety and performance of the RTPS in patients with localized prostate cancer.The RTPS is an investigational device and requires permanent implantation of a small radioactive fiducial, called the Blip, in the prostate.

The high precision of planned radiotherapy treatments requires accurate positioning of the prostate in order to ensure that the tightly conformed dose distribution does not miss the prostate and result in either significant tumor underdosage, an increased dose to the rectum or bladder, or both. Precise delivery has been addressed using a variety of pre-treatment localization systems. The most direct localization of the prostate involves the use of ultrasound, computed tomography (CT), or radiography of permanently implanted fiducial markers.

In this study the safety and performance of a novel investigational tracking system will be evaluated. The Radiation Therapy Positioning System (RTPS) is a radioactive tracking system integrated into the radiotherapy set-up workflow. The System is composed of the Clinical Positioning System (CPS) and a radioactive soft tissue implanted fiducial (Blip), which is permanently implanted in the prostate. By tracking the implanted Blip, the CPS can monitor positional changes prior to and during the treatment.

The accuracy of the RTPS localization will be compared to the CBCT in at least 5 radiation therapy sessions per patient.

Evaluation of Radiation Therapy Positioning System (RTPS) in Patients With Localized Prostate Cancer

Navotek Medical, Ltd.

Tal Shchory, COO

Calypso® 4D Localization System

Lisa Levine, Ph.D.

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.

Positioning and Tracking the Prostate During External Beam Radiation

Beacon® Transponder Implantation and Localization in the Prostate

Varian, a Siemens Healthineers Company

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization
Evaluation of Radiation Therapy Positioning System (RTPS) in Patients With Localized Prostate Cancer	NCT00921193	Prostate Cancer	Radiation Thera...	45 Years -	Navotek Medical, Ltd.
Positioning and Tracking the Prostate During External Beam Radiation	NCT00123838	Prostate Cancer	Calypso® 4D Loc...	18 Years -	Varian, a Siemens Healthineers Company
Positioning and Tracking the Prostate During External Beam Radiation	NCT00123838	Prostate Cancer	Calypso® 4D Loc...	18 Years -	Varian, a Siemens Healthineers Company

Spots Global Cancer Trial Database for tracking

Every month we try and update this database with for tracking cancer trials from around the world to help patients and their families find trials that might be right for them.
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Spots Global Cancer Trial Database for tracking

Every month we try and update this database with for tracking cancer trials from around the world to help patients and their families find trials that might be right for them. We offer this 100% free of charge and do not endorse any of the trials listed here, we hope it helps you or a loved one.

Every month we try and update this database with for tracking cancer trials from around the world to help patients and their families find trials that might be right for them.
We offer this 100% free of charge and do not endorse any of the trials listed here, we hope it helps you or a loved one.