Homocysteine Study (HOST)

This study has been completed.
Sponsor:
Collaborators:
Pan American Laboratories
Abbott Diagnostics Division
Information provided by:
Department of Veterans Affairs
ClinicalTrials.gov Identifier:
NCT00032435
First received: March 20, 2002
Last updated: October 14, 2010
Last verified: October 2010

March 20, 2002
October 14, 2010
May 2001
August 2006   (final data collection date for primary outcome measure)
Not Provided
Not Provided
Complete list of historical versions of study NCT00032435 on ClinicalTrials.gov Archive Site
Not Provided
Not Provided
Not Provided
Not Provided
 
Homocysteine Study (HOST)
CSP #453 - Homocysteinemia in Kidney and Endstage Renal Disease Study (HOST)

The primary objective of this study is to test the hypothesis that administration of folate, pyridoxine (vitamin B6) and cyanocobalamin (vitamin B12) in high doses to patients with advanced chronic renal failure or end stage renal disease and abnormally high plasma homocysteine levels will lower the homocysteine levels and the death rate compared to patients who receive placebo. The secondary objective is to test the hypothesis that intake of the vitamins compared to placebo decreases the incidence of myocardial infarction, disabling stroke, and amputation of a lower extremity and, in hemodialysis patients, thrombosis of the vascular access.

Primary Hypothesis:

The primary objective of this proposal is to test the hypothesis that administration of folate, pyridoxine (vitamin B6) and cyanocobalamin (vitamin B12) in high doses to patients with advanced chronic renal failure or end-stage renal disease and abnormally high plasma homocysteine levels will lower the homocysteine levels and increase survival.

Secondary Hypotheses:

The secondary objectives are to test the hypotheses that intake of the vitamins decreases: 1) MI, 2) stroke, 3) amputation of lower extremity, 4) combination death, MI, stroke and amputation of lower extremity, 5) thrombosis of the vascular access in hemodialysis patients.

Primary Outcome: Death

Interventions: A treated group that receives a daily tablet containing 40mg of folic acid, 100mg of pyridoxine and 2mg of B12 versus a control group that receives a placebo.

Study Abstract:

The experimental design is a prospective, two-arm, randomized, double blind study, stratified for medical center and whether the patient has chronic renal failure or end-stage renal disease. In each arm 1003 patients will ingest daily a capsule containing either 40mg of folic acid, 100mg of pyridoxine and 2mg of vitamin B12, or placebo. We will use stratified randomization to ensure that the treatment is balanced within the end-stage renal disease patients and chronic renal failure patients.

This 6 year study will require an accrual phase of 2 years and a treatment phase lasting a minimum of 4 years. Patients will be screened by their plasma homocysteine concentration. They must have a level of at least 15 uM/L to be enrolled in the study. The study nurse will evaluate each patient at 3 months. Thereafter, patients will be contacted by phone, or mail if they prefer, at 3-month intervals by coordinators at a central location. Secondary endpoint events, hospitalization, onset of dialysis, and death or other reason for exit from the study will be recorded on standard forms. Plasma homocysteine levels will be obtained at 3 months in all patients.

Patients will be excluded if: age less than 21 years, expected life span less than 6 months, pregnancy, metastatic cancer, AIDS-related infection, end-stage liver disease, vitamin B12 deficiency, treatment with methotrexate, or anticonvulsants, unreliable or likely non-compliant, participation in other long-term trial, or unwilling or unable to give informed consent.

For a relative treatment effect of 17% (that is reducing the 3-year death rate from 28% to 23.2%) and 80% power, 2006 patients and 36 VA medical centers are required.

An abundance of published reports has shown a strong correlation between homocysteinemia and the incidence of cardiovascular death. Authors of these papers have unanimously recommended a study be undertaken to determine if folate, pyridoxine, and vitamin B12 can lower the incidence.

The study is to be conducted in patients with chronic renal failure and end-stage renal disease whose plasma homocysteine levels and incidence of cardiovascular death and disease are among the highest of all patient populations. By screening for patients with high plasma homocysteine concentrations and measuring the levels after 3 months, we will be able to determine if the hypothetical reduction in death and cardiovascular event rate is associated with a decrease in plasma homocysteine concentration.

Interventional
Phase 3
Masking: Double-Blind
  • End Stage Renal Disease
  • Renal Failure
  • Drug: PAL-40 Active
  • Drug: PAL-40 Placebo
  • Experimental: 1
    PAL-40 Active
    Intervention: Drug: PAL-40 Active
  • Placebo Comparator: 2
    PAL-40 Placebo
    Intervention: Drug: PAL-40 Placebo

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
2003
September 2006
August 2006   (final data collection date for primary outcome measure)

Inclusion Criteria:

Patients will be screened by their plasma homocysteine concentration. They must have a level of at least 15 mM/L to be enrolled in the study.

Patients will be excluded by any of the following criteria: age less than 21 years, expected life span less than 6 months, pregnancy, metastatic cancer, end-stage liver disease, treatment with methotrexate, other anti-folate medication or anticonvulsants, unreliable or likely noncompliant, participation in another long-term trial, or unwilling or unable to give informed consent.

Exclusion Criteria:

Both
21 Years and older
No
Contact information is only displayed when the study is recruiting subjects
United States,   Puerto Rico
 
NCT00032435
453
No
Jamison, Rex - Study Chair, Department of Veterans Affairs
Department of Veterans Affairs
  • Pan American Laboratories
  • Abbott Diagnostics Division
Study Chair: Rex L. Jamison VA Palo Alto Health Care System
Department of Veterans Affairs
October 2010

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP