Inclusion Criteria:

1. Diagnosis of venous leg ulceration
2. Ankle brachial index of > 0.80 measured during screening or within three months prior to the Day -14 visit.
3. Reference ulcer area greater than 1 cm2 and less than 25 cm2
4. Reference ulcer present for at least 4 weeks
5. Have an ankle circumference of greater than 18 cm
6. Male of female patients aged 18 years or over
7. Able to tolerate effective compression bandaging
8. Patients able to walk independently with or without mobility aids
9. Able and willing to give informed consent
10. Able and willing to attend all follow up visits

Exclusion Criteria:

1. Significant change in ulcer size in the screening period screening period
2. Presence of a non-study ulcer within 2.0 cm of the reference ulcer
3. Wound bed with exposed bone, tendon or fascia
4. Patients with leg ulceration etiology other than venous insufficiency
5. Patients who require wheel chairs for normal mobility
6. Patients who have any ulcer (reference or non-reference) which shows signs of clinical infection
7. Patients who have any ulcer (reference or non-reference) positive for β-hemolytic streptococcus upon culture.
8. Patients who are unable to tolerate or comply with the standardized compression bandaging protocol specified in this protocol
9. Female patients who are pregnant or breastfeeding.

10. Patients who are currently taking:

    1. Pentoxifylline (Trental®)
    2. Immunosuppressive therapy
    3. Oral corticosteroid therapy or topical corticosteroid on the leg where the reference ulcer is located
    4. Growth factors (e.g. Regranex)
    5. Cell cultures or topical skin factors

11. Patients with:

    1. Renal insufficiency defined as an estimated GFR which is < 30 mL/min/1.7m2
    2. Abnormal blood biochemistry defined as 3 times that of the upper limit of the normal range
    3. Hepatic insufficiency defined as total bilirubin > 2 mg/dL or serum albumin < 25 g/L
    4. HbA1c > 8.5%
    5. Hemoglobin < 10 g/dL
    6. Hematocrit < 0.30
    7. Platelet count < 100,000
12. Patients have had a myocardial infarction within the previous 6 months or patients with unstable angina pectoris

13. Patients with:

    1. Collagen vascular disease
    2. Severe rheumatoid arthritis
    3. Cellulitis or osteomyelitis
14. Patients who have, or are suspected of having malignancy, or who have received treatment for any active malignancy, apart from non-melanomatic skin cancer, within 3 months prior to treatment
15. Patients who, in the opinion of the Investigator, have an existing condition that would compromise their participation and follow-up in this study, e.g., known to abuse alcohol or drugs currently or to have psychological disorders that could affect follow-up care