The primary objectives of this study are to evaluate the efficacy, dosing, and safety of an intra-ulcer injection H5.020CMV.PDGF-b in adults who have a venous leg ulcer. The primary endpoint of this Phase I trial is the determination of the Maximum Tolerated Dose (MTD) for the intra-ulcer injection of H5.020CMV.PDGF-b.

Inclusion Criteria:

1. Subject must have an examination by study the investigator that is consistent with a venous leg ulcer (i.e., varicose veins, venous blush, wound in the gaiter area of the leg, dermatitis, lipodermatosclerosis).
2. Subject must have received limb compression therapy for at least 6 weeks without improvement in wound size.
3. The size of the study wound must be larger than 5 and smaller than 60 cm2 as measured by acetate trace and planimetry.
4. By patient history, the study wound must be more than six months old.
5. For subjects with more than one wound that meets requirements 2 and 3, only one wound will be randomly selected and treated with H5.020CMV.PDGF-b.
6. By history, subject must be able to tolerate a limb compression bandage.
7. Ankle brachial index (ABI) greater than or equal to 0.85
8. White blood cell count greater than or equal to 3500/mm3, platelets < 1,000,000/mm3 but greater than 100,000/mm3 and hemoglobin > 10.0 g%.
9. Signed informed consent
10. Subject age must be greater than or equal to 18 years of age. In reality, it would be very unlikely that anyone less than 45 years old will have a venous leg ulcer.

Exclusion Criteria:

1. Subject with any active cancer other than a nonmelanomatous skin cancer. If cancer is in remission, subjects will be excluded unless the remission has extended for at least 10 years.

2. Subjects with life expectancy of less than 6 months.

3. Liver function tests (Alamine Amino Trandferase, ALT; angiotensin sensitivity test, AST; alkaline phosphatase ALK PHOS, and bilirubin) greater than 1.5x upper limit of normal for the reference lab.

4. Sedimentation rate (ESR) at baseline of greater than 60.

5. A Rheumatoid Factor at baseline that is greater than 30 IU/ml (Less than 30 IU/ml is considered negative and 30 to 80IU/ml is considered weakly positive by University of Pennsylvania Pathology Laboratories criteria in use as of March 2007).

6. Anti Nuclear Antibody test of dilutional titer of greater than 1:160 (Less than 1:160 is considered negative by University of Pennsylvania Pathology Laboratories criteria in use as of March 2007)

7. Patients with inter-current organ damage, abnormal laboratory tests, or medical problems that in the opinion of the PI will jeopardize their ability to participate in this study or to heal their wound.

8. Any subject with a recognized rheumatic disease (e.g., lupus, scleroderma, dermatomyositis, rheumatoid arthritis, polymyalgia, etc.) will be excluded from the study

9. Pregnant or lactating females. A pregnancy test will be performed on each fertile premenopausal female prior to entry into the study. Treatment may not begin until the result of the pretreatment pregnancy test is ascertained.

10. Any requirement for systemic corticosteroids or immunosuppressives, or history of corticosteroid or immunosuppressive use in the 4 weeks previous to study entry.

11. Seropositive for hepatitis B or C surface antigen.

12. Patient refusal to use or inability to successfully use a limb compression bandage changed weekly.

13. Any concurrent medical illness that be exacerbated by H5.020CMV.PDGF-b administration.

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