Vitamin D/Calcium Polyp Prevention Study
Public ClinicalTrials.gov record NCT00153816. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
Extensive experimental and observational data suggest that intake of calcium and of vitamin D exert protective effects on colorectal neoplasia. Building on their previous work, the investigators will investigate the chemopreventive effect of vitamin D in the large bowel, to study whether calcium with vitamin D is more effective than calcium alone, and to confirm their positive finding regarding calcium. The goal of this study is the development of chemopreventive combinations that will reduce risk of colorectal neoplasia sufficiently to permit the lengthening of surveillance intervals in most patients and to clarify important issues regarding the mechanisms of colorectal carcinogenesis and chemoprevention.
Study identification
- NCT ID
- NCT00153816
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 2, Phase 3
- Enrollment
- 2,813 participants
Conditions and interventions
Conditions
Eligibility (public fields only)
- Age range
- 45 Years to 75 Years
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jul 2004 (Actual)
- Primary completion
- Oct 2013 (Actual)
- Completion
- Jun 2016 (Actual)
- Last update posted
- Mar 15, 2017
2004 – 2016
United States locations
- U.S. sites
- 10
- U.S. states
- 10
- U.S. cities
- 10
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| University of Southern California | Los Angeles | California | 90089 | — |
| University of Colorado | Denver | Colorado | 80220 | — |
| Emory University | Atlanta | Georgia | 30322 | — |
| University of Iowa | Iowa City | Iowa | 52242 | — |
| University of Minnesota | Minneapolis | Minnesota | 55455 | — |
| Dartmouth Hitchcock Medical Center | Lebanon | New Hampshire | 03766 | — |
| University of North Carolina | Chapel Hill | North Carolina | 27599 | — |
| Cleveland Clinic Foundation | Cleveland | Ohio | 44195 | — |
| University of South Carolina | Columbia | South Carolina | 29203 | — |
| University of Texas | Houston | Texas | 77030 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
Non-U.S. locations
This page focuses on the U.S. directory. The official record also lists 1 non-U.S. site.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00153816, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Mar 15, 2017 · Synced Oct 26, 2026
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Open the official record
The complete public registry record, listed eligibility criteria, and available contact information for NCT00153816 live on ClinicalTrials.gov.