Study to Assess Efficacy and Safety of Bone Marrow Derived Stem Cells in Patients With Critical Limb Ischemia

Efficacy will be determined by number of collateral arteries as assessed magnetic resonance angiography at baseline and again at 3 months, rate of major amputation (above the ankle) of the affected limb within 3 months or an unchanged critical limb ischemia of the affected limb after 3 months defined as less than 15% change in tcPO2 or ABI or absolute ankle pressure.Efficacy endpoint is at 3 months. Clinical endpoints and safety will be measured through 12 months.

Inclusion criteria

• Male and Female patients in the age group of 18-80yrs.
• Established CLI (confirmed by Rutherford 4 to 5) with angiographic evidence of significant infra-inguinal arterial occlusive disease
• Ankle Brachial Pressure Index (ABI) ≤ 0.6 or the absolute ankle blood pressure < 60 mm Hg or TcPO2<20 mmHg without tissue loss or TcPO2<40 mmHg if there is tissue loss or alternatively toe Brachial Pressure Index (TBI) less 0.5 or the absolute toe blood pressure less than 50 mm Hg
• No surgical or interventional option for revascularization and no response to best standard care delivered as confirmed by a vascular surgeon and/or physician.
• No immediate life-threatening complication from CLI which would demand immediate amputation.
• Patients who are able to understand the requirements of the study, and willing to provide voluntary written informed consent, abide by the study requirements, and agree to return for required follow-up visits.
• On optimal medical therapy
• If diabetic, HgbA1c <10%

Exclusion criteria

• Acute life threatening complication of limb ischemia with the need for immediate limb amputation to avoid death or clinical deterioration
• Patients with confirmed Rutherford 6 condition with extensive tissue damage
• Patients with documented terminal illness or cancer or any concomitant disease process with a life expectancy of less than 6 months.
• Patients with a history of severe alcohol or drug abuse within 3 months of screening.
• Known bone marrow diseases which preclude transplantation.
• End-stage renal failure on regular dialysis treatment. Creatinine ≥2.0 mg/dl
• Patients already enrolled in another investigational drug trial or completed within 1month.
• Pregnancy.
• Patients tested positive for HIV screen1or2, Hepatitis C antibody Hepatitis B surface-antigen, HepatitisBcore Antibody, Syphilis screen
• Myocardial infarction / CVA / TIA within the past three months prior to enrollment
• Revascularization procedure in target limb within 6 weeks prior to enrollment
• Laboratory values as show below*
• Currently taking immunosuppressive agents
• If diabetic, diagnosis of proliferative retinopathy
• Patients with infected ulcers or systemic infections *Laboratory Values: Hemoglobin <10 g/dL Platelet count <100,000/microL ALT >60 U/L AST >60 U/L Bilirubin >1.0 mg/dL INR >1.3 unless on Coumadin and at Investigator discretion APTT >40 second unless on Lovenox or Heparin and at Investigator's discretion