Diet and Breast Cancer Prevention Trial

September 2, 2005 updated by: University Health Network, Toronto

An Explanatory Clinical Trial of Breast Cancer Prevention

This randomized controlled trial tests the hypothesis that a reduction in intake of dietary fat will reduce the incidence of breast cancer. Women with more than 50% of the breast occupied by dense tissue on a mammogram have been recruited and allocated by a random (ie chance) process, to an intervention or control group. The intervention group has been taught how to reduce their fat intake to a target of 15% of total calories, while the control group continued their usual consumption of fat. Both groups have then been followed for at least 7 years and the number who develop breast cancer in each group will be compared

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The long term goal of this trial is to determine if intervention in subjects with extensive mammographic densities (a risk factor for breast cancer) with a low fat-high carbohydrate diet will reduce the incidence of breast cancer by 37%. We propose to meet this goal by carrying out a randomized multi-centre trial of dietary intervention in subjects at increased risk of breast cancer that is now in progress.

The method used is to recruit subjects with extensive mammographic densities and enrol them in a randomized trial in which they receive one of two kinds of dietary counselling. A control group receives general advice about nutrition but is not counselled to change their intake of dietary fat or carbohydrate, and an intervention group is given intensive counselling to reduce their intake of total fat to a target of 15% of calories and increase intake of carbohydrate to maintain intake of total calories.

Recruitment to this trial has been in progress in Toronto, Hamilton, London and Windsor since 1991, and in Vancouver since 1994, and all of the 4,615 subjects required for the trial were recruited by November 1998.

The trial is explanatory in that it seeks to determine if there is a biological effect of dietary fat reduction in terms of a reduction in breast cancer incidence. To meet this goal we will select as participants highly motivated subjects who are at increased risk of breast cancer, provide them with a high level of assistance in making a dietary alteration, follow them carefully to ensure the correct identification of subjects who develop breast cancer, and analyse the results both according to intention to treat and dietary compliance. This trial does not attempt to assess directly the possible effects of dietary counselling on the health of the general public.

II Specific Aims

  1. To recruit 4,615 Canadian women with extensive mammographic density and to enrol them in a randomized trial of dietary fat reduction and follow up until 2006.
  2. To compare in the control and intervention groups of this trial the incidence of breast cancers, as well as other histological changes in the breast tissue of patients undergoing surgical biopsy of the breast.
  3. To determine if a reduction in dietary fat intake will reduce either the proportion of the breast area occupied by radiological signs of density or the total quantity of density.

Study Type

Interventional

Enrollment

4695

Phase

  • Phase 3

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
      • Toronto, Ontario, Canada, M5G 2M9
        • University Health Network

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

30 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  1. A mammogram with at least 50% of the breast area occupied by radiological signs of density.
  2. Aged more than 30 years and less than 65 years.
  3. Body Mass Index >19 and <27.
  4. Resident within easy commuting distance of a participating centre. -

Exclusion Criteria:

  1. A previous history of cancer (excluding non-melanomatous skin cancer).
  2. Pregnant (or planning to be) or breast feeding.
  3. On a medically prescribed diet for any reason.
  4. Habitually (ie. 4 or more times per week) eats more than one meal a day in a restaurant.
  5. Previous mammoplasty, either reduction or augmentation.
  6. Previous or present treatment for the reduction of blood lipids.
  7. Proposed breast biopsy as a result of the initial clinical and/or mammographic examination, until such time as the biopsy has been carried out and is known to be benign

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: Prevention
  • Allocation: Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Breast cancer

Secondary Outcome Measures

Outcome Measure
Other cancers
Benign breast disease

Collaborators and Investigators

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

Sponsor

University Health Network, Toronto

Collaborators

Ontario Ministry of Health and Long Term Care
Canadian Breast Cancer Research Alliance

Investigators

  • Principal Investigator: Norman F Boyd, MD, DSc, University Health Network, Toronto

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

January 1, 1988

Study Completion

December 1, 2005

Study Registration Dates

First Submitted

September 2, 2005

First Submitted That Met QC Criteria

September 2, 2005

First Posted (Estimate)

September 7, 2005

Study Record Updates

Last Update Posted (Estimate)

September 7, 2005

Last Update Submitted That Met QC Criteria

September 2, 2005

Last Verified

August 1, 2005

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 01-0428-C
  • 14177 (company internal)

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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