Vitamin D for Chemoprevention

The recruitment status of this study is unknown because the information has not been verified recently.
Verified January 2013 by Dana-Farber Cancer Institute.
Recruitment status was  Active, not recruiting
Harvard School of Public Health
Information provided by (Responsible Party):
Karen Emmons, PhD, Dana-Farber Cancer Institute Identifier:
First received: December 24, 2007
Last updated: January 23, 2013
Last verified: January 2013

This study will help us know the effects of Vitamin D pills in Blacks. The results of this study may be the first step in creating ways to prevent the risks of colon and prostate cancer. It will also help us develop ways to reduce colon cancer and prostate cancer among Blacks. This study will find out if Vitamin D pills can increase Vitamin D to healthy levels in our bodies.

Condition Intervention Phase
Gastrointestinal Cancers
Prostate Cancer
Drug: Vitamin D
Dietary Supplement: Placebo
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Defining Optimal Doses of Vitamin D for Chemoprevention in Blacks.

Resource links provided by NLM:

Further study details as provided by Dana-Farber Cancer Institute:

Primary Outcome Measures:
  • Among Blacks, identify a dose of oral vitamin D supplementation that will result in levels of plasma 25(OH)D that would be predicted to reduce colorectal cancer incidence. [ Time Frame: Baseline, 3months, 6months ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Examine the influence of oral vitamin D supplementation on inflammatory markers and compare germline polymorphic variation in Vitamin D pathway genes between Blacks and a cohort of Whites. [ Time Frame: Baseline, 3months, 6months ] [ Designated as safety issue: No ]

Enrollment: 328
Study Start Date: October 2007
Estimated Study Completion Date: December 2013
Primary Completion Date: October 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: 1
No Vitamin D
Dietary Supplement: Placebo
Placebo pill taken once daily for 3 month
Active Comparator: 2
1000 IU of Vitamin D
Drug: Vitamin D
Taken orally every day for three months
Active Comparator: 3
2000 IU of Vitamin D
Drug: Vitamin D
Taken orally every day for three months
Active Comparator: 4
4000 IU of Vitamin D
Drug: Vitamin D
Taken orally every day for three months

Detailed Description:
  • Participants will be asked to answer some questions about their diet, exercise and health. In addition, participants blood pressure will be taken. These assessments will occur at baseline, 3- and 6-month appointments. At baseline only, we will measure skin tone with a tool called the Photovolt 577.
  • A small blood sample will be taken to see how much Vitamin D is the body and will also look at levels of other markers of disease such as proteins, hormones, and genes.
  • Participants will take a vitamin pill every day for three months and be randomly assigned to one of four different types of pills.
  • Participants will be called or visited at least every two weeks. They will be asked questions to determine if they have any side effects associated with high levels of Vitamin D.
  • At the beginning of the second and third months, participants will be provided with more pills. At the end of the third month, another blood sample will be taken. Three months after that, the final blood sample will be taken.

Ages Eligible for Study:   30 Years to 80 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Between the ages of 30 and 80 years
  • Comfortable communicating in English
  • Currently has a primary care physician
  • Willing to discontinue vitamin D or calcium supplements
  • Willing to have all protocol specific tests run

Exclusion Criteria:

  • Plans on taking a vacation or travel to a sunny region within 3 months of vitamin supplementation period except for a short period (i.e. 1 weekend)
  • Pregnant or breast feeding or planning on becoming pregnant in the following year
  • Pre-existing calcium (including hypercalcemia), parathyroid conditions (including hyperparathyroidism), sarcoidosis
  • No concurrent active malignancies (other than non-melanoma skin cancer) or previous diagnosis of prostate cancer
  • Cognitively impaired
  • Active thyroid disease (e.g. Graves, Hashimoto's or thyroiditis)
  • History of nephrolithiasis, chronic liver disease, chronic renal disease, or renal dialysis
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00585637

United States, Massachusetts
Dana-Farber Cancer Institute
Boston, Massachusetts, United States, 02115
Sponsors and Collaborators
Dana-Farber Cancer Institute
Harvard School of Public Health
Principal Investigator: Edward Giovannucci, MD, ScD Harvard School of Public Health/Brigham and Women's Hospital
Study Director: Gary G Bennett, PhD Dana-Farber Cancer Institute
  More Information

No publications provided by Dana-Farber Cancer Institute

Additional publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Karen Emmons, PhD, Principal Investigator, Dana-Farber Cancer Institute Identifier: NCT00585637     History of Changes
Other Study ID Numbers: 07-342, P15192
Study First Received: December 24, 2007
Last Updated: January 23, 2013
Health Authority: United States: Institutional Review Board
United States: Food and Drug Administration

Keywords provided by Dana-Farber Cancer Institute:
Vitamin D

Additional relevant MeSH terms:
Vitamin D
Bone Density Conservation Agents
Growth Substances
Pharmacologic Actions
Physiological Effects of Drugs processed this record on March 26, 2015