Calcium/Vitamin D, Biomarkers & Colon Polyp Prevention
Public ClinicalTrials.gov record NCT00399607. 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.
The study team has developed a set of biomarkers of risk for colon cancer; this study tests 1) whether or not calcium and/or vitamin D supplementation can favorably affect these biomarkers in persons who are at higher than average risk for colon cancer (ie, have already undergone the removal of colon growths, called adenomatous polyps, which are known to be precursors to developing colon cancer), and 2) whether effects on the biomarkers predict who will get new colon polyps or not.
Study identification
- NCT ID
- NCT00399607
- Recruitment status
- Completed
- Study type
- Observational
- Phase
- Not listed
- Enrollment
- 264 participants
Conditions and interventions
Conditions
Interventions
- Rectal biopsy during colonoscopy Procedure
- Rectal biopsy at randomization Procedure
- Rectal biopsy at 1 year Procedure
- Rectal biopsy prior to colonoscopy Procedure
- Biopsies during colonoscopy Procedure
Procedure
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
- Jun 2006 (Type not available)
- Primary completion
- Feb 2016 (Actual)
- Completion
- Aug 2016 (Actual)
- Last update posted
- Dec 8, 2016
2006 – 2016
United States locations
- U.S. sites
- 9
- U.S. states
- 9
- U.S. cities
- 9
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| USC/Norris Comprehensice Cancer Center | Los Angeles | California | 90089 | — |
| University of Colorado Health Sciences Center | Denver | Colorado | 80220 | — |
| Emory University | Atlanta | Georgia | 30322 | — |
| University of Iowa Hospitals & Clinic | Iowa City | Iowa | 52242 | — |
| University of Minnesota | Minneapolis | Minnesota | 55455 | — |
| Dartmouth-Hitchcock Medical Center | Lebanon | New Hampshire | 03756 | — |
| University of North Carolina | Chapel Hill | North Carolina | 27599 | — |
| Cleveland Clinic Foundation | Cleveland | Ohio | 44195 | — |
| University of South Carolina | West Columbia | South Carolina | 29039 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00399607, 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 Dec 8, 2016 · Synced Oct 22, 2026
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Open the official record
The complete public registry record, listed eligibility criteria, and available contact information for NCT00399607 live on ClinicalTrials.gov.