Efficacy and Safety Study of NV1FGF in Patients With Severe Peripheral Artery Occlusive Disease

Inclusion Criteria: * Outpatients with severe Peripheral Artery Occlusive Disease defined as Rutherford's Grade III, category 5 or 6, or Fontaine's stage IV. * Trophic lesions with no signs of healing (no reduction in ulcer size or depth) for at least 2 weeks prior to first study treatment administration (Day 1). * Patients with objective evidence of peripheral vascular disease (resting ankle pressure \< 70 mmHg and/or toe pressure \< 50 mmHg, and/or resting ankle-brachial index (ABI) \< 0.4 and/or resting toe-brachial index (TBI) \< 0.3 and/or metatarsal pulse volume recording (PVR) flat or barely pulsatile) in the diseased limb on two consecutive examinations performed at least 1 week apart. * Demonstration or documentation (historical data not older than 6 months prior to first study treatment administration) of total occlusion of the affected limb of one or more of the iliac, superficial femoral, popliteal and/or one or more infrapopliteal arteries as assessed by angiography. * Life expectancy \> 6 months from the first study treatment administration. * Poor/not candidates for revascularization (patients suitable for revascularization but with a high risk of failure/ amputation/ or patients not suitable for revascularization). Exclusion Criteria: * Previous or current history of malignant disease. Patients who had successful tumor resection or radio-chemotherapy more than 5 years prior to inclusion in the study and no recurrence will be allowed for inclusion. * Suspicion of malignant disease (abnormal X ray,positive. stool hemoccult, positive Prostate Specific Antigen , abnormal mammography, papanicolaou smear of Class IV or Class V characterization. * Lower extremity surgery : bypass/angioplasty of the leg to be treated within 2 months prior to the first administration of study treatment (Day 1). * Active proliferative retinopathy. * Buerger's disease