PolyArginine Treated vEiN grafTs (PATENT)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00264706
Recruitment Status : Terminated (Reformulation of test compound)
First Posted : December 13, 2005
Last Update Posted : September 8, 2016
Information provided by (Responsible Party):
Lumen Therapeutics

Brief Summary:
The primary objectives of this trial are: 1) to evaluate the safety of NONA-L-ARGININE in ex vivo application to saphenous vein segments prior to grafting; and, 2) to obtain preliminary data on the biological effects of NONA-L-ARGININE, as compared to placebo, in the prevention of neointimal hyperplasia.

Condition or disease Intervention/treatment Phase
Saphenous Vein Graft Disease Drug: Nona-L-arginine Phase 1 Phase 2

Detailed Description:

LT-1951 is an aqueous solution of NONA-L-ARGININE. The drug efficiently penetrates into vascular tissues like the saphenous vein and supplies the tissue with a sustained reservoir of L-arginine, the substrate for production of nitric oxide. Nitric oxide (NO) is an important vasoactive and cell signaling compound implicated in suppression of neointimal hyperplasia. NO limits neointimal hyperplasia by inhibiting monocyte chemotaxis and adherence, platelet adherence and aggregation, and vascular smooth muscle cell proliferation.

A dramatic reduction of neointimal hyperplasia following treatment with LT-1951 has been demonstrated in preclinical vein to artery interposition studies in several animal models. Marked improvement following a single ex vivo application of LT-1951 in interposition grafts demonstrated that the beneficial effect of the drug is not dependent upon continued treatment of the grafted tissue.

In the PATENT trial, saphenous vein grafts are harvested in the usual manner from the patient's leg and are bathed in LT-1951 or placebo ex vivo (at normal pressure and temperature) before being rinsed and implanted into the patient. Because LT-1951 is applied only to the graft, there is minimal systemic exposure and risk to the patient.

All patients in this study will receive treatment with both NONA-L-ARGININE and vehicle control. This within-patient, placebo-controlled, study will be double-blinded and randomized. For each patient, one of the comparable vein grafts will receive treatment with placebo, while the other will receive treatment with NONA-L-ARGININE. Any third vein graft used in the procedure will be treated as per the first vein graft, while any fourth vein graft will be treated as per the second vein graft.

The first cohort of 20 patients will be the primary safety subgroup. This subgroup will be evaluated in combination with a second cohort of 30-80 patients for assessment of efficacy endpoints. During follow-up, all patients will have clinical visits at 6 weeks, which will include Computed Tomographic Angiography (CTA). Patients will undergo Intravascular Ultrasound-coronary angiography (IVUS-angio) at 12 months and optional CTA at 6, 12 and 24 months.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 25 participants
Intervention Model: Single Group Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: PolyArginine Treated vEiN grafTs (PATENT)
Study Start Date : March 2005
Actual Primary Completion Date : April 2008
Actual Study Completion Date : April 2008

Arm Intervention/treatment
Internal control study
Drug: Nona-L-arginine

Primary Outcome Measures :
  1. Safety - as assessed by the nature and frequency of clinical adverse event at 6 weeks post-surgery. [ Time Frame: 6 weeks ]
  2. Efficacy - Volume obstruction of the vein grafts measured by IVUS at 1 year. [ Time Frame: 1 year ]

Secondary Outcome Measures :
  1. 1. Volume obstruction adjacent to the proximal and distal anastomoses, and within the body of the graft; 2. Intima:media ratio; 3. Minimal and maximal luminal diameter; and, 4. lumen volume:vessel volume. [ Time Frame: 1 year ]

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Ages Eligible for Study:   35 Years to 85 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Subject must be 35-85 years of age and able to give informed consent.
  2. Coronary artery disease requiring bypass grafting using at least two saphenous vein bypass grafts carried out through median sternotomy and utilizing cardiopulmonary bypass.
  3. Use of an approved statin anticipated for at least 24 months after surgery.
  4. Subject must not be a candidate for concurrent ventricular surgical restoration, AICD placement, or valvular surgery.
  5. Agreeable to CTA at 6 weeks and IVUS intervention at 12-months post-CABG. Subjects agreeable to additional CTA at 6, 12 and 24 months preferred.

Exclusion Criteria:

  1. Acute traumatic injury or vasculitis.
  2. Insulin-dependent diabetes.
  3. Procedure is for revision for an existing bypass graft.
  4. Procedure is to be minimally invasive (except for harvesting of the graft segment).
  5. Concurrent cardiac valvular surgery.
  6. Patients with any medical condition that, in the investigator's judgment, makes the patient ineligible or places the patient at undue risk (e.g. conditions that preclude standard invasive follow-up procedures such as IVUS and angiography, i.e. renal failure, bleeding diathesis, or peripheral vascular disease preventing catheterization via the groin).
  7. Subject has clinical evidence of infection that the Investigator deems significant to the completion of the procedure, or that could compromise the subject's safety.
  8. Subject has recent history (within past 6 months) of alcohol or drug abuse.
  9. If female, subject is pregnant or trying to become pregnant.
  10. Calculated creatinine clearance < 30 mls/min for non-diabetics or < 50 mls/min for non-insulin dependent diabetics.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00264706

Canada, Ontario
Toronto General Hospital
Toronto, Ontario, Canada, M5G 2C4
Sponsors and Collaborators
Lumen Therapeutics
Principal Investigator: Stephanie Brister, M.D. Toronto General Hospital

Additional Information:
Responsible Party: Lumen Therapeutics Identifier: NCT00264706     History of Changes
Other Study ID Numbers: Lumen-01-CS-1
First Posted: December 13, 2005    Key Record Dates
Last Update Posted: September 8, 2016
Last Verified: September 2016