UCLA Breast Cancer Survivor Health Promotion Research Study

Study Overview
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Brief Summary
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Pilot randomized controlled parallel group behavior change comparative effectiveness trial involves 30 breast cancer survivors interested in losing excess body fat. Both interventions include dietary + exercise prescriptions that hold promise for reducing the survivors' risk of cancer recurrence. Both interventions are consistent with the Dietary Guidelines for Americans but the Diabetes Prevention Program (DPP)-based approach focuses on weight loss through calorie restriction and increased physical activity while the Highly Microbiota-Accessible Foods (HMAFs) approach is intended to be a low-numeracy version of a Mediterranean-style diet and increased physical activity. The DPP approach is considered to be a high-numeracy intervention because it requires that consumers keep track of all calories consumed and expended per day and to endeavor to maintain a calorie deficit each day during the active weight loss phase. For both conditions, the 12 to 13-week intervention includes 2 virtual home visits, 2 virtual group education sessions and 7 telephone or Zoom-based coaching sessions by well-trained intervenors. Assessments occur at baseline and six months, with systemic inflammation (high sensitivity C-reactive protein) being the primary outcome measure and visceral fat being a secondary outcome. Other prespecified secondary outcomes include gut microbiota alpha-1 diversity, insulin resistance, HDL-cholesterol, daily count of highly microbiota-accessible foods, waist circumference, BMI, systolic blood pressure, ratio of fecal Proteobacteria to short chain fatty acid-generating bacteria and health-related quality of life.

Detailed Description
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Background. The human gut microbiota influences obesity status and inflammation, two major risk factors for postmenopausal breast cancer recurrence. Whether an exercise and dietary intervention designed to optimize gut microbiota composition might reduce risk for breast cancer recurrence is unknown. To improve the gut microbiota composition, the investigators propose teaching postmenopausal breast cancer survivors to allocate about 20% of their daily calorie intake to consuming a daily count of six fiber-rich, minimally processed, plant-based food choices that comply with federal MyPlate.gov diet recommendations. Preliminary data suggest that the investigators' Highly-Microbiota-Accessible Foods (HMAFs) approach will yield cardiometabolic outcomes equal to or better than those achieved by the traditional Diabetes Prevention Program (DPP) calorie restriction approach at 6 months follow-up. Because breast cancer recurrence risk covaries with cardiometabolic risks, the lower cardiometabolic risk of the HMAFs approach should be associated with reduced risk of breast cancer recurrence. Hypotheses. The greater diversity of fiber-rich, minimally processed plant foods consumed in the HMAFs condition relative to the DPP condition will result in greater changes in HMAFs participants compared to DPP participants from baseline to 6 months follow-up in the following measures: (primary hypothesis) reduce high sensitivity C-reactive protein, (secondary hypotheses) reduce visceral body fat and increase alpha-1 diversity of gut microbes and increase health-related quality of life. To test these hypotheses, the research objectives include the following specific aims: 1) Recruit a diverse sample of 30 overweight or obese postmenopausal survivors with stage I, II and IIIa breast cancer; randomly allocate them to two lifestyle change intervention conditions, 2) Obtain baseline and 6-month follow-up assessments of: low grade systemic inflammation, body composition including visceral fat estimation, cardiorespiratory fitness, inflammatory and cardiometabolic biomarkers, fecal samples, and quality of life, 3) Conduct two parallel, three-month behavior change interventions, contrasting the 6-count HMAFs approach with the traditional DPP calorie restriction approach , and 4) Use results to design a ramped-up randomized factorial trial. If hypotheses are confirmed, the low-numeracy HMAFs approach may, for low-income survivors, be a practical alternative to traditional high-numeracy calorie restriction approaches to reducing risk of breast cancer recurrence.

Official Title
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A Fiber-diverse, Anti-inflammatory Diet and Aerobic Exercise Reduce Risk of Breast Cancer Recurrence

Conditions
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Breast Cancer

Intervention / Treatment
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* Behavioral: Diabetes Prevention Program-based lifestyle change intervention (DPP)
* Behavioral: Highly Microbiota-Accessible Foods (HMAFs) intervention


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: At least 6 months since breast cancer diagnosis and up to 4 years since diagnosis. Between 50 and 75 years of age. Diagnosed with localized steroid hormone receptor-positive breast cancer, up to stage IIIa. At least 6 months post chemotherapy or radiation treatment. Subjects must be in good health as determined by medical history, physical examination, and clinical laboratory measurements. No broad-spectrum antibiotic use in the last two months. Body mass index between 27 and 38 based on self-reported height and weight and between 25 and 40 based on objective assessment of height and weight. Willing to complete assessments at baseline, 3 months and 6 months follow-up Exclusion Criteria: Diagnosed with metastatic breast cancer Currently undergoing chemotherapy or radiation treatment Immunoglobulin-E (IgE)-mediated food allergies, or any medical condition requiring mandatory dietary restrictions Significant cardiac, pulmonary, renal, liver or psychiatric disease. Muscular, orthopedic, or cardiovascular limitations that would prevent full participation in exercise

Ages Eligible for Study
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Minimum Age: 50 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: The two lifestyle change interventions feature a similar exercise prescription and the same sequence of intervention contacts (2 virtual home visits; 2 virtual group education sessions, 7 individual telephone coaching sessions) but differ in dietary approach. The DPP-based diet approach prescribes desired weight loss in overweight breast cancer survivors by restricting daily calorie intake and promoting increased calorie expenditure via physical activity. The HMAFs approach prescribes consuming an optimal six microbiota-accessible foods unaccompanied by pro-inflammatory food components such as saturated fat or added sugar as well as engaging regularly in exercise that elevates the heart rate and reduces inflammation. Only 20 percent of daily calories need to be devoted to HMAFs; the remaining calories can come from daily food choices conforming to the 2020-2025 Dietary Guidelines for Americans.
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Diabetes Prevention Program-based lifestyle change intervention (DPP)<br>The Diabetes Prevention Program-based lifestyle change intervention (DPP) is designed to help overweight breast cancer survivors to reduce their risk of breast cancer recurrence by reducing their excess body fat. | Behavioral: Diabetes Prevention Program-based lifestyle change intervention (DPP)<br>* The DPP condition consists of 11 health education sessions over 12 weeks, including 2 virtual home visits, two virtual group education sessions and 7 telephone coaching calls. These sessions will teach DPP-based lessons on how to lose excess body fat through calorie restriction and increased physical activity. All dietary and physical activity recommendations are intended to be consistent with federal nutrition and physical activity guidelines.<br>|
| Experimental: Highly Microbiota-Accessible Foods (HMAFs) intervention<br>The Highly Microbiota-Accessible Foods (HMAFs) lifestyle change intervention is designed to help overweight breast cancer survivors reduce their risk of breast cancer recurrence by reducing their elevated low-grade inflammation. | Behavioral: Highly Microbiota-Accessible Foods (HMAFs) intervention<br>* The Highly Microbiota-Accessible Foods (HMAFs) intervention approach includes 11 health education sessions, including two virtual home visits, two virtual group education sessions, and 7 telephone coaching sessions. These sessions are designed to help study participants to identify and consume optimally 6 daily instances of minimally processed, fiber-rich food sources, drawn from all four of the MyPlate.gov categories: vegetables, fruits, whole grains and plant-based protein-rich foods (e.g., legumes, nuts and seeds). Increased physical activity is also recommended as a way to optimize the microbial conversion of fiber-rich food sources to short chain fatty acids, which are then expected to reduce excess low-grade inflammation.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| High-sensitivity C-Reactive Protein (CRP) | CRP is commonly used by researchers as a biomarker for systemic inflammation. | Change from baseline to 6 months follow-up | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Visceral fat as assessed by DXA | Visceral fat is also known as intra-abdominal fat. It is located inside the peritoneal cavity, packed in between internal organs and torso. It is the most metabolically active adipose tissue and positively associated with systemic inflammation. | Change from baseline to six months follow-up | 
| Shannon index of alpha diversity of fecal microbial species | Fecal DNA from the V4 region of the 16S ribosomal RNA will be amplified, sequenced and filtered for quality before statistical analysis. The Shannon index measures both gene richness and evenness. | Change from baseline to six months follow-up | 
| Number of highly microbiota-accessible foods consumed per day | From participants' 24-hour diet recalls - The daily sum of different carbohydrate-rich food sources minimally processed and unaccompanied by pro-inflammatory components, especially saturated fat and added sugar. | Change from baseline to six months follow-up | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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obesity, physical activity, fiber diversity, calorie restriction, inflammation