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Trial to Assess Chelation Therapy (TACT). Principal Investigator: Gervasio A. Lamas, MD Mount Sinai Medical Center – Miami Heart Institute Miami Beach FL. TACT Design. 5-year randomized, double-blind, placebo-controlled; 2X2 factorial trial;

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Trial to Assess Chelation Therapy (TACT)

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trial to assess chelation therapy tact

Trial to Assess Chelation Therapy (TACT)

Principal Investigator: Gervasio A. Lamas, MD

Mount Sinai Medical Center – Miami Heart Institute

Miami Beach FL

tact design
TACT Design
  • 5-year randomized, double-blind, placebo-controlled;
  • 2X2 factorial trial;
  • Testing the standard chelation solution versus placebo;
  • Testing the effects of a high-dose antioxidant vitamin and mineral supplementation, versus a low dose regimen.
specific aims
Specific Aims
  • To determine whether chelation or high-dose supplements in patients with CHD will reduce the incidence of clinical cardiovascular events;
  • To determine whether chelation and high-dose supplements have acceptable safety profiles.
substudy specific aims
Substudy Specific Aims

Two substudies will be conducted whose specific aims are as follows:

  • To determine whether chelation or high-dose supplements improve quality of life;
  • To conduct an economic analysis of chelation therapy and high dose supplements.
inclusion criteria
Inclusion Criteria
  • Men or women age 50 and older
  • MI >6 weeks prior to randomization
definition of mi
Definition of MI
  • Biomarkers + (symptoms or ECG changes)


  • Imaging evidence of myocardial scar + evidence of coronary disease on angiography.

This requires PI involvement, especially the decision that the CAD corresponds to an imaged scar. Remember that the CCC is always happy to help.

major exclusion criteria
Major Exclusion Criteria
  • Chelation within 5 years
  • Known allergy to any components of solutions or vitamins
  • Carotid and coronary revascularization within 6 months, or planned revascularization
  • Symptomatic HF, or HF hospitalization within 6 months
  • Uncontrolled hypertension
  • No venous access
  • Creatinine >2.0mg/dL
  • Baseline platelets <100,000
  • Cigarette smoking within 3 months
primary endpoint
Primary Endpoint
  • Composite clinical endpoint including:
    • all cause mortality
    • myocardial infarction
    • stroke
    • coronary revascularization
    • hospitalization for angina
secondary endpoints
Secondary Endpoints
  • Composite serious irreversible vascular events including: cardiovascular death, or non-fatal MI or non-fatal stroke.

Dr. Lee

event rate assumptions
Event Rate Assumptions
  • 20% event rate (primary endpoint) in control arm after 2.5 years of follow-up
  • Chelation therapy will reduce event rate by 25% (if patients comply)
  • 7% of patients per year will discontinue the infusions (20% over 3 years)
  • 3% loss to follow-up
statistical power of tact
Statistical Power of TACT

With these assumptions, 2,372 patients will


  • 85% power for detecting a 25%  in the primary endpoint, taking into account non-compliance and loss to follow-up
the clinical unit
The Clinical Unit
  • Principal Investigator (PI) with NIH Clinical Investigator training module completed
  • Research coordinator with NIH Clinical

Investigator training module completed

  • Commitment to follow protocol
  • FWA
  • IRB approval
  • Training in chelation
  • Training in evidence-based cardiology
  • Internet access
  • Infusion area
  • Patient base
study overview
Study Overview
  • Infusion Visits
    • Initial - Weekly X 30 wks
    • Maintenance - Every 5 – 8 weeks
    • Enter data into internet data collection system during or immediately post visit
study overview1
Study Overview
  • Patient Follow-up:
    • 3 phone calls/year (average 2.5 years f/u)
    • 1 annual clinic visit
    • Clinic visit at end of study
pharmacy delivery of study drugs
Pharmacy – Delivery of Study Drugs
  • Infusion Kits – UPS delivery the morning before scheduled visit
    • 500 ml bag IV solution
    • 2 - 20ml syringes
  • Vitamins – Initial supply shipped with first kit
    • Subsequent shipments on 1st each month
    • Subsequent shipments contain 2-month supply (360 tablets in a bottle; 60 gel-caps in blister packs)
pharmacy security and storage
Pharmacy – Security and Storage
  • Infusion Kit refrigerated (2-8 degrees C)
  • Vitamins at room temperature
  • Store study drugs in secure location with limited access
pharmacy simple mixing instructions
Pharmacy – Simple Mixing Instructions
  • Prepare infusion just prior to administration
  • Inject 2 syringes of solution into IV bag using 21 g needles
  • Allow solution to reach room temp prior to infusing (30 minutes)
  • Administer within 24 hrs of mixing
potential toxicity
Potential Toxicity
  • Nephrotoxicity
  • Hypocalcemia
  • Hypoglycemia
  • Hypotension
  • Trace metal and vitamin deficiencies
  • Venous access problems
  • Clotting parameters
  • Febrile episodes
  • ECG changes
  • Fluid overload
subject safety
Subject Safety
  • EDTA dose is adjusted based on estimated creatinine clearance (Jan 15, 2003 section 6.2)
  • Kidney. Doubling of the creatinine from baseline or increase to a level of 2.5 mg/dLwill lead to cessation of infusions and continuation of the vitamin regimen. We will also look for signs of hematuria and/or proteinuria, which will prompt further evaluation.
  • Liver. Doubling of the ALT, AST, alkaline phosphatase or bilirubin will be lead to interruption of infusions and a potential re-challenge.
  • Hematology. Platelet count < 100,000, or a 50% decrease from baseline will lead to elimination of heparin.
study interventions
Study Interventions
  • ACAM protocol EDTA chelation vs placebo
  • High dose antioxidant vitamins and minerals vs placebo
low dose regimen

Low-Dose Regimen

These supplements, produced by OleoMed S.A., Madrid, Spain, are administered in an olive oil based gel capsule.

quality of life endpoints
Quality of Life Endpoints

Data collected by structured interview in 1000 randomly selected patients

  • Cardiac physical functioning: Duke Activity Status Index
  • Psychological well-being: SF-36 MHI5
  • Patient utilities: EuroQoL
  • Analysis by intention to treat
economic analysis
Economic Analysis
  • Medical resource consumption on CRF
  • Compared by intention to treat
  • Cost weights assigned from 2º sources
  • CEA if 1º study endpoint positive for experimental arms

Dr. Lee

statistical analysis overview
Statistical Analysis - Overview
  • Treatment comparisons performed according to “intention to treat”
  • Treatments compared using “two-sided” statistical tests
  • Analysis will incorporate not only how many events occur, but also when they occur