Vitamin D and Breast Cancer: Does Weight Make a Difference?

Study Overview
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Brief Summary
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This is a research study of the effect of Vitamin D on breast cancer. We hope to learn whether Vitamin D can change characteristics of certain genes in a breast cancer tumor that affect its growth. We believe some of these characteristics may be influenced by body weight.

Detailed Description
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Vitamin D3 (cholecalciferol, colecalciferol) is one of type of vitamin D which is made by the skin when exposed to sunlight; it is also found in some foods and can be taken as a dietary supplement. It is used to treat and prevent vitamin D deficiency and associated diseases, including rickets. Vitamin D3 may have a role obesity and cancer biology. In the body, Vitamin D3 is metabolized to the active form 1,25-dihydroxycholecalciferol (calcitriol, 1,25-(OH)2vitamin D3). This protocol is a randomized, controlled, and blinded clinical trial in obese and non-obese breast cancer patients in whom the effects of vitamin D supplementation will be evaluated in the neoadjuvant setting. Changes in biomarker expression levels in blood will be assessed from baseline to post-treatment (post-surgery). Per protocol (see title), the treatment groups are defined as those participants with body mass index (BMI) ≤ 25 (non-obese) and > 25 (obese). Within each treatment group, dose of Vitamin D3 was stratified between 400 IU/day (control) and 10,000 IU/day (experimental). All analyses were typically conducted between BMI cohorts stratified by Vitamin D3 dose. Protocol Primary Objective: To determine whether dietary vitamin D can reverse the negative effects of obesity and insulin resistance as reflected by changes in breast cancer gene expression patterns in obese and non obese subjects diagnosed with breast cancer. Protocol Secondary Objectives: To determine whether dietary vitamin D can reverse the negative effects of obesity and insulin resistance as reflected by serum biomarkers of insulin resistance and adipokine secretion in obese and non obese subjects diagnosed with breast cancer. The following markers will be part of this study. Insulin-like growth factor-binding protein 3 (IGFBP-3) is a Vitamin D target, and the most abundant of 6 different IGFBPs. The insulin-like growth factors 1 and 2 (IGF-1 and IGF-2) binds to IGFBP-3 with high affinity, which helps lengthen the half-life of circulating IGFs in all tissues. Through this binding action, IGFBP-3 exerts anti-proliferative effects by blocking the ability of IGFs to activate the IGF-1 receptor (IGF1R, which stimulates cell proliferation). IGFBP-3 levels were assessed on the basis of mRNA levels. p21 [also known as p21Cip1; p21Waf1, cyclin-dependent kinase inhibitor 1 (CDKI1) or cyclin-dependent kinase (CDK)-interacting protein 1 (CDKIP1)] is the primary mediator of p53-dependent cell cycle arrest in response to DNA damage, and is a proliferation; apoptosis; and invasion biomarker. p21 is primarily associated with inhibition of CDK2, but is capable of inhibiting all cyclin/CDK complexes. p21 3 levels were assessed on the basis of mRNA levels. Matrix metalloproteinase-11 (MMP-11), aka Stromelysin-3 (SL-3), is involved in the breakdown of extracellular matrix in the disease processes of metastasis and arthritis, as well as various normal physiological processes, such as embryonic development, reproduction, and tissue remodeling. MMP-11 levels were assessed on the basis of mRNA levels. Ki-67 (Antigen Identified By Monoclonal Antibody Ki-67, Antigen Ki67) is the protein produced by the gene MKI67, and is a nuclear protein that is associated with cellular proliferation and ribosomal RNA transcription. Ki-67 is a recognized biomarker for mitotic rate and cellular, but is absent in resting (quiescent) cells (Stage G0). In breast cancer, Ki67 identifies a subset of patients with ER-positive breast cancer that is highly proliferative, and who derive greater benefit from adjuvant chemotherapy. MKI67 levels were assessed on the basis of mRNA levels. ESR1 is the gene encoding estrogen receptor alpha (ERα), also known as NR3A1 (nuclear receptor subfamily 3, group A, member 1), and is a nuclear receptor that is activated by the sex hormone estrogen. ERα plays a role in the physiological development and function of a variety of organ systems to varying degrees, including the reproductive, central nervous, skeletal, and cardiovascular systems. Genetic polymorphisms in ESR1 have been associated with breast cancer. ESR1 levels were assessed on the basis of mRNA levels. Leptin is a stimulator of adipose stromal cell estrogen synthesis and a breast cancer growth promoter. Serum levels of leptin correlate with body mass index (BMI, a measure of obesity) and breast cancer risk. Leptin receptors are expressed by breast cancer cells and leptin can promote (regulate) breast cancer cell proliferation. Leptin levels were measured by Western blot or immunohistochemical (IHC) methodology. Adiponectin inhibits breast cancer growth. Adiponectin receptors are expressed by breast cancer cells and adiponectin can inhibit (regulate) breast cancer cell proliferation by stimulating apoptosis in estrogen receptor (ER)+ Breast cancer cells and suppressing estrogen-stimulated cell growth. Adiponectin levels were measured by Western blot or immunohistochemical (IHC) methodology. Homeostasis Model of Assessment - Insulin Resistance (HOMA-IR) is a standard determination of insulin resistance based on fasting insulin and glucose levels. cRP (C-reactive protein) is an inflammation marker produced by the liver. High levels of CRP in the blood are indicative of a wide variety of conditions, including cancer. cRP levels were measured by Western blot or immunohistochemical (IHC) methodology.

Official Title
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Vitamin D and Breast Cancer: Does Weight Make a Difference?

Conditions
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Breast Cancer

Intervention / Treatment
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* Drug: Vitamin D


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Women who have undergone a core needle biopsy demonstrating an operable breast cancer whom have not yet had any further therapy. No prior therapy for breast cancer. Age 18 years or older. Any menopausal status Planned surgical resection of breast cancer or repeat core biopsy tissue sampling prior to initiation of neoadjuvant systemic chemotherapy. Availability of tissue blocks from initial core needle biopsy. Signed informed consent. Willing to discontinue use of all supplements containing Vitamin D for the duration of the study, and take only the Vitamin D provided by the study. Exclusion Criteria: Presence of any Metastatic lesion. History of parathyroid disease, hypercalcemia, or kidney stones. History of Selective estrogen receptor modulator (SERM) or aromatase inhibitor therapy. Receiving metformin. History of renal failure requiring dialysis or kidney transplantation. Women who are known to be pregnant or who are nursing. (As vitamin D does not have toxicity to the fetus, a negative pregnancy test is not a requirement to participate in the study.) Patients planned for surgical therapy of their breast cancer or initiation of systemic chemotherapy, that would not allow for at least 7 days of vitamin D intervention Any condition potentially interfering with subjects ability to comply with taking study medication. Any medical condition that would potentially interfere with vitamin D absorption. Current participation in another research study that would increase risk to subject, in the opinion of the investigators. Patients currently taking more than 2000 IU of Vitamin D.

Ages Eligible for Study
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Minimum Age: 18 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: Basic Science
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Non-obese (Body Mass Index ≤ 25)<br>Non-obese participants receive Vitamin D at 400 or 10,000 IU/day | Drug: Vitamin D<br> <br> * Other names: cholecalciferol;|
| Experimental: Obese (Body Mass Index > 25)<br>Obese participants receive Vitamin D at 400 or 10,000 IU/day | Drug: Vitamin D<br> <br> * Other names: cholecalciferol;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Expression Level of Insulin-like Growth Factor-binding Protein 3 (IGFBP-3) Gene | To determine whether dietary vitamin D can reverse the negative effects of obesity and insulin resistance as reflected by changes in breast cancer gene expression patterns in obese and non-obese subjects diagnosed with breast cancer. IGFBP-3 is an endocrine factors. Insulin-like growth factor-binding protein 3 (IGFBP-3) gene expression was assessed at baseline and after treatment in participants with body mass index (BMI) ≤ 25 and > 25. By design, the outcome was determined for non-obese vs obese participants stratified between 400 IU/day (control) and 10,000 IU/day (experimental), and is reported as the mean of the slope (a measure of magnitude of difference) between baseline and post-treatment, with standard deviation. A positive slope indicates increased expression, and a negative slope indicates decreasing values, with the larger values (positive or negative) indicating greater effect, and smaller values indicating lesser effect. | up to 6 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Expression Level of Cyclin-dependent Kinase Inhibitor 1 (CDKI1; p21) Gene | p21 [aka p21Cip1; p21Waf1, cyclin-dependent kinase inhibitor 1 (CDKI1) or cyclin-dependent kinase (CDK)-interacting protein 1 (CDKIP1)] gene expression was assessed at baseline and after treatment in participants with body mass index (BMI) ≤ 25 and > 25. By design, the outcome was determined for non-obese vs obese participants stratified between 400 IU/day (control) and 10,000 IU/day (experimental), and is reported as the mean of the slope (a measure of magnitude of difference) between baseline and post-treatment, with standard deviation. A positive slope indicates increased expression, and a negative slope indicates decreasing values, with the larger values (positive or negative) indicating greater effect, and smaller values indicating lesser effect. | up to 6 weeks | 
| Expression Level of Matrix Metalloproteinase-11 (MMP-11) Gene | Matrix metalloproteinase-11 (MMP-11), aka Stromelysin-3 (SL-3), gene expression was assessed at baseline and after treatment in participants with body mass index (BMI) ≤ 25 and > 25. By design, the outcome was determined for non-obese vs obese participants stratified between 400 IU/day (control) and 10,000 IU/day (experimental), and is reported as the mean of the slope (a measure of magnitude of difference) between baseline and post-treatment, with standard deviation. A positive slope indicates increased expression, and a negative slope indicates decreasing values, with the larger values (positive or negative) indicating greater effect, and smaller values indicating lesser effect. | up to 6 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Vitamin D, Obesity