Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.
NCT00153816 · ClinicalTrials.gov registry record · Phase 2
Vitamin D/Calcium Polyp Prevention Study
A Phase 2 study, sponsored by Dartmouth-Hitchcock Medical Center.
- Completed
- Registry status
- Phase 2
- Development phase
- 2,813
- Enrollment target
NCT00153816: Completed Phase 2 study, sponsored by Dartmouth-Hitchcock Medical Center.
NCT00153816 is a Phase 2 study that has completed, run by Dartmouth-Hitchcock Medical Center. The registered enrollment target is 2,813 participants, above the 133-participant average among 30,622 other Phase 2 trials with a reported enrollment target (2015% higher). According to ClinicalTrials.gov, the official US trial registry.
The verdict
NCT00153816, a Phase 2 study, has completed, sponsored by Dartmouth-Hitchcock Medical Center.
- COMPLETED
- Registry status
- Phase 2
- Development phase
- 2,813 participants
- Enrollment target
Study Summary
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.
Interventions
- DRUG placebo
- DRUG Vitamin D3
- DRUG Calcium Carbonate
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 2,813 participants |
| Start Date | 2004-07 |
| Est. Completion | 2016-06 |
| Phase | Phase 2 |
What the finished NCT00153816 record still lists
NCT00153816 is an interventional study that assigns participants to a tested intervention. Its 2,813 participants enrollment target places it among the larger protocols in the corpus, above the 133-participant average among 30,622 other Phase 2 trials with a reported enrollment target (2015% higher).
The record links to 0 conditions, and to 3 interventions - of which placebo is the first listed.
NCT00153816 does not publish any study locations in the registry export this page uses.
Frequently Asked Questions
What is clinical trial NCT00153816 about?
NCT00153816 is a clinical study titled "Vitamin D/Calcium Polyp Prevention Study". 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 wit...
What is the current status of trial NCT00153816?
This trial is currently completed. It is a Phase 2 study. The enrollment target is 2,813 participants. The study started on 2004-07. Estimated completion is 2016-06.
What interventions are being tested in trial NCT00153816?
The interventions under investigation include: placebo (DRUG), Vitamin D3 (DRUG), Calcium Carbonate (DRUG).
Who is sponsoring clinical trial NCT00153816?
This trial is sponsored by Dartmouth-Hitchcock Medical Center, which has 427 total clinical trials registered on ClinicalTrials.gov.
Learn More About Clinical Trials
How this trial's enrollment target compares
Where NCT00153816's enrollment target sits among peer trials
2,813 6th of 2000 higher than 1,995 of 2,000 other Phase 2 trials
participants (enrollment target), bucketed by value
Each bar is a band; taller bars hold more other Phase 2 trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov registry export · 2026-08-08
Nationwide trials with similar profiles
Cross-condition peers matched on enrollment target and registry start date, not the same-condition list above.
Similar enrollment target
- NCT05932602 · 2,812 participants
AVEIR DR Coverage With Evidence Development (CED) Study
- NCT02273297 · 2,821 participants
Healthy Start: Exploring the Fuel-mediated Programming of Neonatal Growth
- NCT05443737 · 2,800 participants · Phase 3
Evaluation of a Telehealth Oncofertility Care Intervention in Adolescent and Young Adult Cancer Patients
- NCT05899439 · 2,800 participants
Immune Function and the Progression to T1D
Similar registry start date
- NCT05988463 · started 2027-01-01 · Phase 1
Dose-Escalation Study of Artesunate Patients With IPF
- NCT07219706 · started 2026-12-10 · NA
Dietary Fiber and Time Restricted Eating
- NCT02831335 · started 2026-12-01
Technical Development of Multi-Parametric Renocerebral MRI
- NCT05962346 · started 2026-12 · NA
Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia