NCT05838716 · University of Rochester NCORP Research Base
High-Dose Vitamin D Supplementation for ADT-Induced Bone Loss in Older Prostate Cancer Patients
What this study is about
This phase III trial tests whether high-dose vitamin D works in treating androgen-deprivation therapy (ADT)-induced bone loss in patients with prostate cancer who are undergoing androgen-deprivation therapy. Vitamins are substances that the body needs to grow and develop normally. Vitamin D helps the body absorb calcium. Calcium is one of the main building blocks of bone.
View original scientific description
This phase III trial tests whether high-dose vitamin D works in treating androgen-deprivation therapy (ADT)-induced bone loss in patients with prostate cancer who are undergoing androgen-deprivation therapy. Vitamins are substances that the body needs to grow and develop normally. Vitamin D helps the body absorb calcium. Calcium is one of the main building blocks of bone. A lack of vitamin D can lead to bone diseases such as osteoporosis or rickets.
Interventions
PROCEDURE
Biospecimen Collection
Undergo collection of blood
DIETARY_SUPPLEMENT
D Vitamin
Given PO
PROCEDURE
Dual X-ray Absorptiometry
Undergo DXA scan
DRUG
Placebo Administration
Given PO
OTHER
Quality-of-Life Assessment
Ancillary studies
OTHER
Questionnaire Administration
Ancillary studies
Primary outcome measures
Reduction of bone mineral density (BMD) loss as measured at the total hip
Time frame: At 52 weeks
Will determine the efficacy of high-dose vitamin D (HDVD) supplementation versus placebo in reducing BMD loss as measured at the total hip via dual-energy x-ray absorptiometry (DXA) at 52 weeks. Will use analysis of covariance (ANCOVA) with group (vitamin D or placebo) as the main factor, baseline timepoint (\[T\]1) BMD as covariate, and week 52 (T3) BMD as the outcome. Study site will be included as a random effect independent of residual error. An initial linear mixed model (LMM) will be fit using Restricted Maximum Likelihood (REML) estimation. The significance of the variance due to study site will be tested using the Wald Test.
Reduction of BMD loss as measured at the femoral neck
Time frame: At 52 weeks
Will determine the efficacy of HDVD supplementation versus placebo in reducing BMD loss as measured at the femoral neck via DXA at 52 weeks. Will use ANCOVA with group (vitamin D or placebo) as the main factor, baseline (T1) BMD as covariate, and week 52 (T3) BMD as the outcome. Study site will be included as a random effect independent of residual error. An initial LMM will be fit using REML estimation. The significance of the variance due to study site will be tested using the Wald Test.
Reduction of BMD loss as measured at the distal radius
Time frame: At 52 weeks
Will determine the efficacy of HDVD supplementation versus placebo in reducing BMD loss as measured at the distal radius via DXA at 52 weeks. Will use ANCOVA with group (vitamin D or placebo) as the main factor, baseline (T1) BMD as covariate, and week 52 (T3) BMD as the outcome. Study site will be included as a random effect independent of residual error. An initial LMM will be fit using REML estimation. The significance of the variance due to study site will be tested using the Wald Test.
Reduction of BMD loss as measured at the lumbar spine
Time frame: At 52 weeks
Will determine the efficacy of HDVD supplementation versus placebo in reducing BMD loss as measured at the lumbar spine via DXA at 52 weeks. Will use ANCOVA with group (vitamin D or placebo) as the main factor, baseline (T1) BMD as covariate, and week 52 (T3) BMD as the outcome. Study site will be included as a random effect independent of residual error. An initial LMM will be fit using REML estimation. The significance of the variance due to study site will be tested using the Wald Test.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Be diagnosed with Stage I-IV prostate cancer without metastases to bone (lymph node involvement and prior diagnosis of a primary cancer is allowed)
- Be age 60 years or older
- Be starting ADT or have received their first ADT treatment in the past 3 months, with a total of at least 6 planned months of treatment (both luteinizing hormone-releasing hormone \[LHRH\] antagonists and LHRH agonists are permitted)
- Have a total serum vitamin D between 10 and 27 ng/ml
- Have a total serum calcium of less than or equal to 10.5 mg/dl
- Have a normal GFR (glomerular filtration rate \> 30ml)
- Agree not to take calcium and/or vitamin D supplements for the duration of the intervention other than those provided by the study
- Be able to provide written informed consent
- Be able to swallow pills and capsules
- Be able to speak and read English
Exclusion criteria
- Have long term (greater than 3 months) use of any pharmacologic bone-modifying agent including but not limited
Where
- Newark, Delaware
- Danville, Illinois
- Decatur, Illinois
- Effingham, Illinois
- Mattoon, Illinois
- O'Fallon, Illinois
- Urbana, Illinois
- Kansas City, Kansas
- Overland Park, Kansas
- Topeka, Kansas
- Westwood, Kansas
- New Orleans, Louisiana
And 30 more locations — see the full list below.
Collaborators
National Cancer Institute (NCI)
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jan 15, 2026 · Source of record for eligibility and locations