Clinical trial · Interventional
Vitamin D in Postmenopausal Women at High Risk for Breast Cancer
Effects of High-Dose Vitamin D on Circulating Vitamin D Levels and Breast Density in Postmenopausal Women at High Risk for Breast Cancer Development
NCT00859651CI-TRIAL-00029676completedPhase 2Results postedClinicalTrials.gov clinicaltrialsProvenance
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
This is a phase II study which will enroll 20 postmenopausal women who are at high risk for breast cancer development. The goal is to determine whether a one-year intervention of high-dose vitamin D at 2 different doses (20,000 IU weekly or 30,000 IU weekly) will increase circulating blood levels of vitamin D and to obtain preliminary data on the biologic effects of vitamin D for breast cancer prevention.
Conditions
Conditions (1)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Breast Cancer | Malignant Breast Neoplasm | CURATED_EXACT | 0.92 |
Interventions
Interventions (2)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| Cholecalciferol | Drug | — | UNRESOLVED |
| Placebo capsule | Drug | — | UNRESOLVED |
Design
Arms and outcomes
Arms (2)
- type
- ACTIVE_COMPARATOR
- label
- 20,000 IU weekly
- description
- Postmenopausal women who are at increased risk for breast cancer development receiving vitamin D3, oral cholecalciferol 20,000 IU weekly, for one year. Cholecalciferol 20,000 IU (2 active capsules + 1 matching placebo capsule)
- interventionNames
- Drug: Cholecalciferol
- Drug: Placebo capsule
- type
- ACTIVE_COMPARATOR
- label
- 30,000 IU weekly
- description
- Postmenopausal women who are at increased risk for breast cancer development receiving vitamin D3, oral cholecalciferol 30,000 IU weekly, for one year. Cholecalciferol 30,000 IU (3 active capsules)
- interventionNames
- Drug: Cholecalciferol
Primary outcomes (1)
- measure
Eligibility
Eligibility (as posted)
- Sex
- Female
- Minimum age
- 21 Years
Show eligibility criteria text
Inclusion Criteria: * Elevated risk of breast cancer defined as having at least one of the following: (1) Predicted 5-year modified Gail model risk of 1.67% or greater, (2) Lobular carcinoma in situ, (3) Known BRCA1 or BRCA2 deleterious mutation carrier, (4) Prior history of ductal carcinoma in situ, if no current tamoxifen use or prior radiation to the contralateral breast. * Age 21 years or older. * Postmenopausal defined as \> 6 months since the last menstrual period, prior bilateral oophorectomy, or serum follicle-stimulating hormone (FSH)/luteinizing hormone (LH) values consistent with institutional normal values for the postmenopausal state. * Baseline mammographic density ≥25% as assessed qualitatively by the mammographer (25-50% = "scattered fibroglandular densities"; \>50-75% = "heterogeneously dense breasts"; \>75% = "extremely dense breasts"). * Baseline serum 25-hydroxyvitamin D \<32 ng/ml. * Normal breast exam and mammogram (Breast Imaging Reporting and Data System (BIRADS) score of 1 or 2) or abnormal breast imaging with a benign breast biopsy without evidence of cancer. Normal baseline breast magnetic resonance imaging (MRI) (BIRADS score of 1, 2, or 3). * Prior tamoxifen or raloxifene use is allowed provided treatment is discontinued at least 28 days prior to enrollment. * At least one breast available for imaging. No bilateral breast implants. * Willingness to not take vitamin D supplements during the one year intervention, but up to 1000mg of calcium supplementation is allowed. * Normal serum calcium. * Adequate renal and hepatic function: serum creatinine, bilirubin, aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase \< 2.0 x the institutional upper limit of normal (IULN). * Performance status of 0 or 1. Exclusion Criteria: * Other prior malignancy. The following is allowed: adequately treated basal cell or squamous cell skin cancer, in situ cervical cancer, adequately treated stage I or II cancer from which the participant is currently in complete remission, or any other cancer (including breast cancer) for which the participant has been disease-free for 5 years. * History of kidney stones. * Hypersensitivity reactions to vitamin D. * On estrogen replacement therapy. * Significant medical or psychiatric condition that would preclude study completion.
References
Publications (0)
Data not yet available
No reference posted for this study.