Safety and Efficacy of Autologous Bone Marrow Mononuclear Cells in Patients With Severe Critical Limb Ischemia
Critical Limb Ischemia
Other: Autologous Bone Marrow Mononuclear cells (BMMNCs)
|Study Design:||Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||To Study and Demonstrate the Safety and Efficacy of RES-Q Prepared Bone Marrow Mononuclear Cells Injected Into Ischemic Tissue of Patients With Non-Reconstructable Critical Limb Ischemia (CLI).|
- Number of Participants With Adverse Events as a Measure of Safety and Major Limb Amputation Free Survival Post BMMNC Administration [ Time Frame: 1, 3, 6 and 12 Months ] [ Designated as safety issue: Yes ]The Primary objective of this study was to determine the safety of intramuscular administration of concentrated autologous BMMNCs harvested, and processed using the Res-Q 60 technology (a point-of-care system). Safety measurements included close vigilance for major limb amputation free survival at 1, 3, 6 and 12 months post BMMNCs administration and stringent reporting of AEs and SAEs.
- Degree of Angiogenesis Measured by the Number of Collateral Blood Vessels Formed at 12 Months [ Time Frame: Baseline and 12 month ] [ Designated as safety issue: No ]Measurement of blood supply facilitated by the formation of collateral blood vessels assessed by CT angiography after the procedure.
- Measurement of Mean Change in Ankle Brachial Index From Baseline to 12 Months [ Time Frame: Baseline, 1, 3, 6 and 12 months ] [ Designated as safety issue: No ]ABI was used to provide a measure of blood flow in the lower limbs. It is the ratio of the blood pressure in the lower limbs to the blood pressure in the upper limbs. Compared to the upper limb, lower blood pressure in the lower limb is an indication of blocked arteries (peripheral vascular disease). The ABI was calculated by dividing the systolic blood pressure at the ankle by the systolic blood pressures in the arm. ABI test was performed at baseline, 1 month, 3 months, 6 months, and 12 months.
- Measurement of Change in Transcutaneous Oxygen Pressure (TcPO2) From Baseline to 12 Months [ Time Frame: Baseline, 1, 3, 6 and 12 months ] [ Designated as safety issue: No ]TcPO2 was used to assess the partial pressure (tension) of oxygen in the capillaries of tissues of lower limbs. It was measured by applying a special set of electrodes to the skin. These electrodes contain photoelectric sensors capable of detecting the specific wavelengths of radiation emitted by oxygenated versus reduced hemoglobin.
- Change in Rest Pain and Intermittent Claudication Assessment From Baseline to 12 Months [ Time Frame: Baseline, 1, 3, 6 and 12 months ] [ Designated as safety issue: No ]
Rest pain is a burning sensation felt at rest, usually in the skin of the foot. It is a symptom of critical ischemia due to severe, chronic, and occlusive peripheral arterial disease (PAD). While, Intermittent Claudication is a crampy leg pain that occurs during exercise, especially walking. The pain is due to the insufficient blood flow in the legs (caused by blocked arteries). Intermittent claudication is the most prominent symptom of PAD.
Both Rest Pain assessment and Intermittent Claudication assessment was performed through Visual Analog Scale or Visual Analogue Scale (VAS). VAS is a psychometric (self-report) response scale that ranges from 0 to 10, where a mark of zero indicates no pain and a mark of 10 indicates worst possible pain.
- Clinical Evaluation for the Presence of Ulcer and/or Gangrene in the Affected Limb From Baseline to 12 Months [ Time Frame: Baseline, 1, 3, 6 and 12 months ] [ Designated as safety issue: No ]Evaluation of the integument for ulceration, gangrene and other skin changes in the affected limb was performed at baseline and follow-up visits at 1 month, 3 months, 6 months, and 12 months.The ulceration and gangrene in the affected limb of the subjects was evaluated by visual clinical inspection.
- Number of Participants Able to Walk From Baseline to 12 Months as Measured by 6-Minute Walk Test [ Time Frame: Baseline, 1, 3, 6 and 12 months ] [ Designated as safety issue: No ]Subjects were analyzed to see if they were able to walk any distance and the distance covered by patients in 6 minutes was measured to assess the functional changes from baseline. The American Thoracic Society has issued guidelines for the 6-minute walk test (6 MWT). The 6 MWT is safe, easy to administer, well tolerated, and reflects activities of daily living.
|Study Start Date:||February 2011|
|Study Completion Date:||July 2013|
|Primary Completion Date:||January 2013 (Final data collection date for primary outcome measure)|
Experimental: BMMNC treated group
Autologous bone marrow mononuclear cell concentrate (BMMNCs) prepared using the Res-Q 60 technology (a point of care system) to be injected intramuscularly into multiple sites in the ischemic muscle tissue of the affected limb at 0.5 cc/injection for a total of 15-20 cc.
Other: Autologous Bone Marrow Mononuclear cells (BMMNCs)
Multiple intramuscular injections of concentrated bone marrow derived mononuclear cells (0.5 cc/injection) into the ischemic muscle of the affected limb.
Other Name: Autologous bone marrow mononuclear cell concentrate
A total of 15 patients suffering from end stage IV and V Rutherford /CLI in whom all previous therapeutic strategies failed (e.g. surgical revascularization) will be selected and undergo local transplantation of autologous BMMNCs. Conventional treatments include angioplasty and /or bypass to remove blood vessel blockage for restoring blood supply, along with prescribed medicines that aid in ulcer recovery and wound healing and debridement of damaged/infected tissue. Amputation is inevitable in many cases because some blood capillaries cannot be corrected and restenosis of vessels is very common. Cell therapies with mononuclear cells from patients own bone marrow is promising because these stem cells are capable of stimulating and regenerating capillaries and blood vessels (neovascularization).
This is a Phase Ib (feasibility study), prospective, non randomized and open labeled study aimed to find out the safety and efficacy of intramuscular autologous bone marrow mononuclear cells implantation in patients with chronic critical limb ischemia.
The efficacy/safety of this therapy will be assessed by using several endpoints such as (a) prevention of amputation, (b) wound healing and (c) degree of angiogenesis. In order to assess the limb ischemia, the measurements will be performed at pre- and post transplantation at a variety of time intervals. The measurements include: ABI-ankle brachial index, Transcutaneous partial pressure of Oxygen (TcPO2), 6 min walk test, Rest pain and intermittent Claudication assessment, Healing of ulcers/ wounds and angiography of the affected limb.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01472289
|Fortis Escorts Heart Institute & Research Centre|
|New Delhi, India|
|Study Director:||Venkatesh Ponemone, PhD||TotipotentRX, Center for Cellular Medicine|
|Study Chair:||Kenneth Harris, MS||TotipotentRX, Centre for Cellular Medicine|
|Principal Investigator:||Suhail Bukhari, MBBS, FNBE||Fortis Escorts Heart Institute and Research Centre|