High Dose Vitamin D Study

Colorectal Cancer Clinical Trial

Official title: Study of High-dose Vitamin D Supplementation in Stage-4 Colorectal Cancer Patients

Status Completed

Clinical Trial Summary

The purpose of this study is to investigate the therapeutic effect and the safety of high-dose vitamin D supplementation in metastatic colorectal cancer patients. We propose to supplement metastatic (stage 4) colorectal cancer patients with oral doses of vitamin D to raise serum 25-hydroxy-vitamin D [25(OH)D] levels to the high normal range of 200-250 nmol/L. The primary objective of this study is to evaluate the metabolic consequences, including tolerability and toxicity, of prolonged, high-dose physiological vitamin D in patients with colorectal cancer. The secondary objective is to evaluate patient survival with regards to high-dose vitamin D supplementation.

Hypothesis:

Whereas low doses of vitamin D reportedly play a significant role in prevention of colorectal cancers, do much larger (pharmacological) doses of vitamin D have a significant therapeutic effect against the same kind of cancer?

Clinical Trial Description

Metastatic (stage 4) colorectal cancer patients who were randomly assigned to the treatment arm of this study will be orally supplemented with high doses of vitamin D to achieve serum 25(OH)D concentrations of 200-250 nmol/L (80-100 ng/ml). Therefore, the supplementation dosage is not pre-set but will be determined on an individual basis. Vitamin D supplementation will be continued for 16 months, followed by a 12 month follow up period. Monthly monitoring of serum 25(OH)D and calcium levels will assure the safety of our treatment protocol. Subjects in the control arm of the study will be receiving standard cancer care at InspireHealth that includes supplementation with at least 2,000 International Units of vitamin D. ;

Related Conditions & MeSH terms

• Colorectal Cancer
• Colorectal Neoplasms

• NCT number: NCT01150877
• Study type: Interventional
• Source: University of British Columbia
• Status: Completed
• Phase: Phase 1/Phase 2
• Start date: January 2011
• Completion date: April 23, 2014