Prostate Margin Reduction to Reduce Acute Rectal Toxicity (PROTRACT) (PROTRACT)

July 2, 2019 updated by: Beibei Zhang, Southlake Regional Health Centre

Reducing Acute Rectal Toxicity for Hypofractionated Prostate Radiotherapy - An Multi-institution Pilot Study of Reduced PTV Margin

The objectives of this study are:

  1. Retrospectively validate a reduced margin schema for intermediate risk prostate hypofractionated VMAT treatments
  2. Demonstrate in a prospective pilot clinical trial that patients planned and treated with the reduced margin schema will have reduced acute rectal toxicity

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Detailed Description

Hypofractionated radiotherapy is being adopted as standard practice for intermediate risk prostate cancer patients. The objective of this project is to retrospectively validate whether reducing the Planning Target Volume (PTV), a margin placed around the prostate to account for movement and variability in patient placement, will have reduced acute rectal toxicity. The project will focus on patients with intermediate risk prostate cancer treated with hypofractionated Volumetric Modulated Arc Therapy (VMAT) from multiple institutions. The investigators intend to prospectively demonstrate that patients planned and treated with the reduced margin, along with using advanced image-guidance and consistent bladder and rectum preparation will have reduced acute rectal toxicity.

The project consists of two phases: phase one is a retrospective planning study and phase two is a prospective pilot clinical trial.

Phase one aims to validate the benefits of the proposed decrease in PTV margin by assessing whether the investigators can continue to deliver the intended radiation dose to the prostate while further sparing the rectum. This will be accomplished by evaluating the daily delivered dose on Cone-Beam Computed Tomography (CBCT), a daily scan performed during treatment that determines the location of the prostate and rectum. Using these CBCT scans, the investigators can reconstruct the radiation dose delivered to any organs of interest which was affected by their relative positions each day. There are two parts in this phase one retrospective planning study. Part one will focus on 30 intermediate risk prostate cancer cases already treated with hypofractionation (60 Gy in 20 fractions) using the standard PTV margins from all three participating institutions. All 30 cases will then be re-planned using the reduced PTV margin and dose reconstruction will be performed on daily CBCT to confirm adequate target coverage of the prostate. Part two aims to demonstrate that the reduced PTV margin can help enable hypofractionation. Thirty cases that were originally intended to receive a hypofractionated regimen of 60 Gy in 20 fractions but had to either switch to a standard fractionation treatment of 78 Gy in 39 fractions (a regimen used when 60Gy in 20 fractions is not achievable), or where there had to be compromised target coverage of the prostate, due to Organs at Risk (OAR) receiving unacceptable doses of radiation, will be selected. These cases will be re-planned with the validated smaller PTV margin to illustrate that they would now be eligible to receive hypofractionation due to the reduced dose to OARs.

Phase two aims to demonstrate that patients treated with the reduced PTV margin will have reduced acute rectal toxicity as evaluated by the Cancer Care Ontario (CCO) Expanded Prostate Cancer Index Composite for Clinical Practice (EPIC-CP) Quality of Life (QOL) questionnaire. Two groups of patients will be accrued: one group of 25 patients will be planned and treated with the current standard PTV margin as the control group, while the second group of 25 patients will be planned and treated with the reduced PTV margin validated from the phase one retrospective study. A comparison of rectal toxicity scores between these two groups will then be carried out using the EPIC-CP questionnaire.

Study Type

Interventional

Enrollment (Anticipated)

50

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Canada
    • Ontario
      • Newmarket, Ontario, Canada, L3Y 2P9
        • Southlake Regional Health Centre
      • Toronto, Ontario, Canada, M4N 3M5
        • Sunnybrook Health Sciences Centre
      • Toronto, Ontario, Canada, M5G 2M9
        • Princess Margaret Cancer Centre

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Male

Description

Inclusion Criteria:

  1. Male patients with intermediate-risk prostate cancer receiving external beam radiotherapy
  2. Age greater than or equal to 18 years
  3. Agreeable to proposed follow-up schedule and able to complete quality of life questionnaire as proposed

Exclusion Criteria:

  1. Previous radiotherapy to the pelvic region
  2. Inflammatory bowel disease or chronic colitis.
  3. Connective tissue disorders such as scleroderma.
  4. Patients with hip replacements

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Standard margin
Patient cohort planned with the current standard PTV margin
Radiation: External beam radiation therapy
Patient will receive 60Gy in 20 fractions as per standard practice
Experimental: Reduced margin
Patient cohort planned with the reduced margin validated from the retrospective study
Radiation: External beam radiation therapy
Patient will receive 60Gy in 20 fractions as per standard practice

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Reduced acute rectal toxicity from reduced PTV margin
Time Frame: 6 months
Patients planned and treated with reduced PTV margin will have a change of 2 points in Cancer Care Ontario (CCO) Expanded Prostate Cancer Index Composite for Clinical Practice (EPIC-CP) bowel symptom scores, demonstrating better toxicity outcomes. This patient reported outcome questionnaire evaluates bowel symptom scores in four aspects: rectal pain or urgency of bowel movement, increased frequency of bowel movements, overall problems with bowel movements, and bloody stools. Each aspect has a score ranging from 0 to 4. The total scores for an individual patient ranges from 0 to 16, with lower score indicating a better outcome.
6 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Southlake Regional Health Centre

Collaborators

University Health Network, Toronto
Sunnybrook Health Sciences Centre

Investigators

  • Principal Investigator: Beibei Zhang, PhD, Southlake Regional Health Centre

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Anticipated)

August 1, 2019

Primary Completion (Anticipated)

August 1, 2020

Study Completion (Anticipated)

August 1, 2021

Study Registration Dates

First Submitted

June 28, 2019

First Submitted That Met QC Criteria

June 28, 2019

First Posted (Actual)

July 2, 2019

Study Record Updates

Last Update Posted (Actual)

July 5, 2019

Last Update Submitted That Met QC Criteria

July 2, 2019

Last Verified

July 1, 2019

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 043-1819

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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