Alberta Physical Activity and Breast Cancer Prevention (ALPHA) Trial
Recruitment status was Active, not recruiting
The purpose of the ALPHA Trial is to examine the physiologic changes that occur in a woman's body when she begins exercising that may be related to a change in her risk of getting breast cancer.
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Prevention
|Official Title:||Alberta Physical Activity and Breast Cancer Prevention (ALPHA) Trial|
- To examine the effect of the exercise intervention on estrone, estradiol and adiposity
- To examine the effect of the exercise intervention on mammographic density, insulin-like growth factors, and insulin resistance
- To describe the effects of the exercise intervention on quality of life among the participants
- To describe the rates and determinants of recruitment and adherence to the exercise trial
|Study Start Date:||June 2002|
|Estimated Study Completion Date:||July 2007|
The goal of this study is to examine how a one-year exercise intervention, as compared to a usual sedentary lifestyle, influences specific biologic mechanisms that are hypothesized to be operative in the association between physical activity and breast cancer risk. These biologic mechanisms include sex hormone concentrations (estrone, estradiol and sex-hormone binding globulin); measures of adiposity and obesity; mammographic density; insulin-like growth factors; and insulin resistance.
A two-centered, two-armed randomized controlled trial (RCT) of exercise and risk factors for breast cancer will be conducted. Approximately 334 postmenopausal, sedentary women will be recruited to the study. Participants will be randomized to one of two groups: an exercise intervention, or a control group. The intervention group will undertake five weekly exercise sessions of 60 minutes each; three will be facility-based and two will be home-based each week. The Edmonton and Calgary exercise oncology facilities will be working in collaboration, and each will include both the controls and exercise intervention arms of the trial. The exercise intervention will last for 12 months. The control group will be asked not to change their usual level of activity during that time.
Baseline assessments will be obtained of serum sex hormones (estrone and estradiol), measures of obesity and adiposity, mammographic density, serum IGF-1, insulin resistance, aerobic capacity, and psychosocial health measures. At the end of the study, all baseline assessments will be repeated and compared between the two groups.
This study will specifically address identified gaps in knowledge, in terms of examining the simultaneous effect of physical activity on several biologic mechanisms in a controlled trial setting, building on evidence from the only other randomized controlled trial on this topic. Strengths of the proposal include the multi-centered setting (utilizing facilities in both Calgary and Edmonton), and the collaboration of an experienced multi-disciplinary research team from across North America.
|Alberta Cancer Board|
|Calgary, Alberta, Canada, T2N 4N2|
|University of Alberta|
|Edmonton, Alberta, Canada, T6G 2H9|
|Principal Investigator:||Christine M Friedenreich, PhD||AHS Cancer Control Alberta|