EW-A-401 to Treat Intermittent Claudication
| Status: | Completed |
|---|---|
| Conditions: | Peripheral Vascular Disease, Cardiology |
| Therapuetic Areas: | Cardiology / Vascular Diseases |
| Healthy: | No |
| Age Range: | 21 - Any |
| Updated: | 4/21/2016 |
| Start Date: | March 2004 |
| End Date: | December 2011 |
Modulation of Vascular Endothelial Growth Factor (VEGF) Using an Engineered Zinc-Finger Transcription Factor to Treat Lower Limb Intermittent Claudication
This study will test the safety of a drug called EW-A-401 in patients with intermittent
claudication - pain and discomfort in the legs due to blockages of the arteries. The study
will also evaluate whether EW-A-401 improves blood flow to the legs. EW-A-401 contains
genetic material (DNA) that instructs the body to produce specific proteins that promote the
growth of new blood vessels and may, therefore, improve blood flow to the legs.
Patients 21 years of age and older with pain or discomfort of one or both legs due to
blockages of the arteries below the groin may be eligible for this study. Candidates are
screened with a medical history, physical examination, blood and urine tests, eye
examination, chest x-ray and CT scan of the chest, and treadmill tests. Patients who are
able to exercise more than 12 minutes on the treadmill may not enroll in the study.
Participants undergo the following procedures:
- Muscle biopsy: On the first day of the study, patients have a muscle biopsy. This
procedure is done under local anesthesia with mild sedation. A 1-inch incision is cut
into the skin over a calf muscle and a small amount of muscle tissue is removed for
examination by a pathologist.
- Drug treatment and tests: About 10 to 13 days after the biopsy, patients are admitted
to the NIH Clinical Center for 3 to 5 days for drug treatment and tests. They receive
10 injections of either the study drug (EW-A-401) or placebo (an inactive substance) in
each leg during a single session lasting about 1 hour. In addition, they have blood and
urine tests, complete questionnaires about their symptoms, and undergo magnetic
resonance imaging (MRI), a test that a magnetic field and radio waves to produce
detailed images of body tissues and organs. For this procedure, the patient lies on a
table that slides into the scanner (a large hollow tube) for imaging of the blood
vessels in the legs. Patients wear headphones to muffle loud knocking and thumping
sounds that occur during the scanning process.
- 30-day follow-up: Patients return to the Clinical Center three times over 30 days
following the hospital stay for a medical history, physical examination, and blood and
urine tests to assess the safety of EW-A-401.
- Extended follow-up: Patients return to the Clinical Center at 3, 6, and 12 months after
hospitalization for a medical history and physical examination, blood and urine tests,
two treadmill tests, questionnaires about symptoms, and MRI studies, including imaging
for blood flow measurement. Blood flow to the legs is measured during MRI using large
blood pressure cuffs inflated around the legs during the scanning. The cuffs are
inflated very tightly for 5 minutes, and then a dye is injected into an arm vein to
brighten the images. Additional pictures are taken over the next 5 to 10 minutes. At
two of these follow-up visits, patients also have an eye examination, and at the 3- or
6-month visit they have a repeat muscle biopsy of the calf.
The study lasts 12 months. After 6 months, patients will be told whether they received
EW-A-401 or placebo. Because EW-A-401 is so new, patients will continue to be contacted
every year after the study is completed.
claudication - pain and discomfort in the legs due to blockages of the arteries. The study
will also evaluate whether EW-A-401 improves blood flow to the legs. EW-A-401 contains
genetic material (DNA) that instructs the body to produce specific proteins that promote the
growth of new blood vessels and may, therefore, improve blood flow to the legs.
Patients 21 years of age and older with pain or discomfort of one or both legs due to
blockages of the arteries below the groin may be eligible for this study. Candidates are
screened with a medical history, physical examination, blood and urine tests, eye
examination, chest x-ray and CT scan of the chest, and treadmill tests. Patients who are
able to exercise more than 12 minutes on the treadmill may not enroll in the study.
Participants undergo the following procedures:
- Muscle biopsy: On the first day of the study, patients have a muscle biopsy. This
procedure is done under local anesthesia with mild sedation. A 1-inch incision is cut
into the skin over a calf muscle and a small amount of muscle tissue is removed for
examination by a pathologist.
- Drug treatment and tests: About 10 to 13 days after the biopsy, patients are admitted
to the NIH Clinical Center for 3 to 5 days for drug treatment and tests. They receive
10 injections of either the study drug (EW-A-401) or placebo (an inactive substance) in
each leg during a single session lasting about 1 hour. In addition, they have blood and
urine tests, complete questionnaires about their symptoms, and undergo magnetic
resonance imaging (MRI), a test that a magnetic field and radio waves to produce
detailed images of body tissues and organs. For this procedure, the patient lies on a
table that slides into the scanner (a large hollow tube) for imaging of the blood
vessels in the legs. Patients wear headphones to muffle loud knocking and thumping
sounds that occur during the scanning process.
- 30-day follow-up: Patients return to the Clinical Center three times over 30 days
following the hospital stay for a medical history, physical examination, and blood and
urine tests to assess the safety of EW-A-401.
- Extended follow-up: Patients return to the Clinical Center at 3, 6, and 12 months after
hospitalization for a medical history and physical examination, blood and urine tests,
two treadmill tests, questionnaires about symptoms, and MRI studies, including imaging
for blood flow measurement. Blood flow to the legs is measured during MRI using large
blood pressure cuffs inflated around the legs during the scanning. The cuffs are
inflated very tightly for 5 minutes, and then a dye is injected into an arm vein to
brighten the images. Additional pictures are taken over the next 5 to 10 minutes. At
two of these follow-up visits, patients also have an eye examination, and at the 3- or
6-month visit they have a repeat muscle biopsy of the calf.
The study lasts 12 months. After 6 months, patients will be told whether they received
EW-A-401 or placebo. Because EW-A-401 is so new, patients will continue to be contacted
every year after the study is completed.
Lower limb intermittent claudication, muscular pain with exercise relieved promptly by rest,
is a disabling syndrome affecting over 10 million patients in the United States.
Intermittent claudication is caused by peripheral artery atherosclerosis, the same disease
causing heart attack. Peripheral artery atherosclerosis impairs blood flow to skeletal
muscles in the lower limbs. Growth factors, such as vascular endothelial growth factor
(VEGF-A), have been shown in animal studies to improve blood flow the lower limbs by
promoting the growth of new blood vessels.
This clinical study tests the safety and feasibility of gene transfer of an agent (EW-A-401)
intended to improve blood flow in the skeletal muscle of subjects with intermittent
claudication. The investigational agent is a circle of genetic material (plasmid DNA) that
instructs the body to produce a genetically-engineered transcription factor, a protein that
regulates expression of genes. This specific transcription factor has been shown in animal
studies to increase expression of the VEGF-A gene, and to promote the growth of new blood
vessels. The study agent will be delivered by injection into leg muscle during a single
session. This is the first human experience using this transcription factor.
This study has a randomized, double-blind, dose-escalation, placebo-controlled design. The
primary outcome measure will be safety and toxicity. In addition, we will collect
exploratory effectiveness information including blood flow, walking capacity, quality of
life, and inspection of blood vessels on samples of leg muscle.
is a disabling syndrome affecting over 10 million patients in the United States.
Intermittent claudication is caused by peripheral artery atherosclerosis, the same disease
causing heart attack. Peripheral artery atherosclerosis impairs blood flow to skeletal
muscles in the lower limbs. Growth factors, such as vascular endothelial growth factor
(VEGF-A), have been shown in animal studies to improve blood flow the lower limbs by
promoting the growth of new blood vessels.
This clinical study tests the safety and feasibility of gene transfer of an agent (EW-A-401)
intended to improve blood flow in the skeletal muscle of subjects with intermittent
claudication. The investigational agent is a circle of genetic material (plasmid DNA) that
instructs the body to produce a genetically-engineered transcription factor, a protein that
regulates expression of genes. This specific transcription factor has been shown in animal
studies to increase expression of the VEGF-A gene, and to promote the growth of new blood
vessels. The study agent will be delivered by injection into leg muscle during a single
session. This is the first human experience using this transcription factor.
This study has a randomized, double-blind, dose-escalation, placebo-controlled design. The
primary outcome measure will be safety and toxicity. In addition, we will collect
exploratory effectiveness information including blood flow, walking capacity, quality of
life, and inspection of blood vessels on samples of leg muscle.
- INCLUSION CRITERIA:
1. Adults greater than or equal to 21 years.
2. Limiting lower limb intermittent claudication due to infra-inguinal obstructive
atherosclerosis, not optimal for catheter-based treatment.
3. Patient femoral artery inflow by radio contrast or magnetic resonance
angiography within the previous 12 months.
4. Stable symptoms for at least 4 months.
5. Peak walking time (PWT) on standardized Gardner Exercise Treadmill Exam between
1 and 12 minutes.
6. Resting ankle-brachial systolic blood pressure index (ABI) less than 0.9 in the
more-affected limb.
7. Bilateral PAD for subjects enrolled into Strata C-F with the less-affected limb
having any of the following:
- Resting or post-exercise ABI less than or equal to 0.9.
- Typical intermittent claudication.
- Infrainguinal obstructive atherosclerosis in a femoropopliteal and/or tibial artery
greater than or equal to 70%.
Subjects enrolled into Strata A and B may have both unilateral or bilateral peripheral
atherosclerotic disease.
EXCLUSION CRITERIA:
1. Any history of malignancy or a known genetic predisposition for developing cancer
except for curatively resected basal cell carcinoma of skin, squamous cell carcinoma
of skin, cervical carcinoma in situ, or resected benign colonic polyps.
2. Non-compressible arteries (resting ankle-brachial systolic blood pressure index (ABI)
greater than 1.3 in the more-affected limb).
3. Evidence of malignancy after screening according to modified American Cancer Society
Guidelines in the following organ systems (screening procedures in addition to
history and physical exam are noted):
-Prostate: subjects with the following PSA levels above the recommended age-specific
cut-points will be excluded
Age 50-59 greater than or equal to 3.7
Age 60-69 greater than or equal to 5.1
Age 70-79 greater than or equal to 7.0
Age 80 plus-greater than or equal to 7.2
Subjects with PSA values above the age-specific cut-points are eligible if a prostate
biopsy, within 12 months, shows neither prostate cancer nor high-grade prostatic
intraepithelial neoplasia (PIN).
- Breast: mammogram
- Cervix: Pap smear
- Colon: Colonoscopy
- Skin
- Lung: contrast chest CT scan
4. Proliferative retinopathy, severe non-proliferative retinopathy, advanced age-related
macular degeneration, especially subjects with chorodial neovascularization, diabetic
retinopathy, macular edema, or intraocular surgery within 3 months.
5. Limiting symptom on Gardner Exercise Treadmill Examination other than intermittent
claudication.
6. Co-morbid conditions that limit exercise capacity:
- Severe arthritis affecting lower extremities
- Severe chronic obstructive pulmonary disease
- Angina pectoris greater than Canadian Angina Class 2
- Dyspnea greater than New York Heart Association Class II
7. Cardiovascular surgery or percutaneous revascularization within 4 months.
- Inclusion is permitted two or more months after successful iliac stenting in the
presence of significant infra-inguinal atherosclerotic obstruction.
- Inclusion is permitted immediately after unsuccessful attempts at percutaneous
recanalization of total occlusions of infra-inguinal arteries.
8. Coagulopathy:
- aPTT greater than 1.4 x mean laboratory normal reference range
- International Normalized Ration of Prothrombin Time greater than 1.5
- Patients on anticoagulation therapy are eligible to participate, with reversal
of coagulopathy in accordance with ACC/AHA guidelines, except patients with:
Recent arterial (0-1 month) thromboemboism; Recent venous (0-3 months)
thromboembolism; Recurrent venous thromboembolism; Non-valvular atrial
fibrillation and previous thromboembolism; Mechanical prosthetic valve.
9. Women of childbearing potential.
10. Subjects unwilling to use barrier contraception during the study.
11. Subjects unsuitable for unilateral investigational thigh compression for perfusion
measurements due to:
- Patent femoropopliteal or femorotibial bypass graft or patent femoropopliteal
stent on both limbs.
- Subjects with one of the above features who are amenable to contralateral thigh
compression are eligible for enrollment.
12. Immune compromise including chronic HIV, HBV, and HCV infection.
13. Contraindication to Magnetic Resonance Imaging:
- Allergy to Gadolinium MRI contrast agents.
- Implanted cardiac pacemaker or defibrillator.
- Central nervous system aneurysm clips.
- Implanted neural stimulator.
- Cochlear implant.
- Ocular foreign body (e.g. metal shavings).
- Insulin Pump.
- Metal shrapnel or bullet.
- Note: When subjects can provide evidence that their implanted device is labeled
compatible with MRI, exceptions to the above exclusions can be made and recorded
in the note.
14. Creatinine clearance less than or equal to 20 mL per minute. Creatinine clearance
(CLcr) will be estimated using the Cockcroft-Gault formula.
15. Current alcohol, drug abuse, severe medical, psychiatric, behavioral, or emotional
disorder of any other condition that may preclude a subject from complying with all
requirement of the protocol.
16. Subjects receiving experimental medication or participating in another study
receiving an experimental drug or procedure within 30 days prior to enrollment.
17. Unable or unwilling to provide written informed consent.
We found this trial at
3
sites
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9000 Rockville Pike
Bethesda, Maryland 20892
Bethesda, Maryland 20892
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