Preliminary Testing of New Treatment for Chronic Leg Wounds

Varicose Ulcer Clinical Trial

Official title:

Phase I Trial to Evaluate the Safety of Platelet Derived Growth Factor B (PDGF-B) and a Limb Compression Bandage in Venous Leg Ulcers

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00000431
• Other study ID #: N01AR92238
• Secondary ID: N01AR92238-000NI
• Status: Completed
• Phase: Phase 1
• First received: January 18, 2000
• Last updated: May 8, 2013
• Start date: January 2005
• Est. completion date: March 2011

Study information

• Verified date: March 2009
• Source: University of Pennsylvania
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Food and Drug Administration
• Study type: Interventional

Clinical Trial Summary

Most chronic (long-lasting) wounds of the leg (also known as venous ulcers) fail to heal in a reasonable period of time. Although researchers have made great progress in understanding how the body repairs wounds, attempts to develop new treatments have been disappointing. In general, treatments based on recent findings about the details of wound repair have not greatly reduced the number of people who have chronic wounds. The long-term goal of this study is to evaluate a new approach for healing a chronic wound. Current methods of directly applying substances that are involved in wound healing to a chronic wound do not cause enough healing. PDGF-B (platelet-derived growth factor B), a factor associated with wound healing, might dramatically enhance healing if a genetically engineered virus is injected into the wound that causes cells in the wound to produce PDGF-B in large quantities.

Description:

Most chronic wounds of the leg fail to heal in a reasonable period of time. In fact, despite considerable advances in elucidating the molecular basis of wound repair, attempts to develop new therapies have been disappointing. In general, therapies based on recently elucidated mechanisms of wound repair have had minimal effect on the overall number of individuals with a treated healed chronic wound. The long-term goal of this study is to evaluate a new approach for healing a chronic wound. Current methods of applying cytokines as a topical protein to treat chronic wounds result in an inadequate response. PDGF-B, a growth factor associated with wound healing, might dramatically enhance wound healing when produced in large quantities in the wound bed via adenovirus-mediated gene overexpression by the cells of the wound bed.

This study consists of two trials. The goal of Trial A, a dose-escalation trial, is to determine the maximum tolerated dose (MTD) of PDGF-B/Ad5, an adenovirus vector designed to overexpress PDGF-B, with respect to local and systemic toxicity and biologic feasibility. The primary objective is to evaluate the acute safety, both local and systemic, of an intra-ulcer injection of PDGF-B/Ad5, thereby determining the recommended dose. Upon evaluating patients, they will be treated with a single intra-ulcer injection of PDGF-B/Ad5 in the wound. Patients will receive only one dose, which will be administered during a 72-hour inpatient stay in a research unit at the Hospital of the University of Pennsylvania.

This study will use a standard three-six dose-escalation scheme. The MTD is defined as the highest dose for which fewer than two of six subjects experience a severe adverse reaction. Each patient will be closely monitored for clinical adverse reactions resulting from treatment with PDGF-B/Ad5. Toxicity will be graded according to the National Cancer Institute's Common Toxicity Criteria Scale.

The primary objective of Trial B is to evaluate the safety and biologic feasibility of the MTD of PDGF-B/Ad5 reported in Trial A in a standard 24-week trial for treatment of a venous leg ulcer. For this study, 15 consecutive patients will be treated using the MTD. All patients will receive a single intra-ulcer injection of PDGF-B/Ad5 and a limb compression bandage to be changed weekly.Study participants will be followed for 24 weeks, which is the length of most FDA-approved venous leg ulcer trials.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 24
• Est. completion date: March 2011
• Est. primary completion date: July 2008
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years to 90 Years

Eligibility

Inclusion Criteria:

• Patient must have a venous leg ulcer.

• Patient must have failed at least 6 weeks of limb compression.

• Wound must be free of necrotic debris.

• Wound must be greater than 5 cm2 and less than 20 cm2.

• Wound must be more than 6 months old.

• Affected limb must have an ankle-brachial index (ABI) > 0.85.

• Patient must be more than 18 years old.

Exclusion Criteria:

• Any active cancer or cancer in remission for less than 10 years.

• Patients with life expectancy of less than 6 months.

• Liver function tests (Alanine Transaminase(ALT) Aspartate Amino Transfer (AST) Alkaline Phosphatase (ALK PHOS) and bilirubin) greater than 1.5x upper limit of normal for the reference lab.

• Patients with intercurrent organ damage or medical problems.

• Pregnant or lactating females.

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

• Seropositive for hepatitis B surface antigen or hepatitis C antibody.

• Any concurrent medical illness that may be exacerbated by PDGF-B/Ad5 administration.

Study Design

Allocation: Non-Randomized, Endpoint Classification: Safety Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Varicose Ulcer

Intervention

Drug:
• PDGF-B/Ad5
This is a dose finding study to evaluate the safety of a single injection of PDGF dna in an adenoviral vector.

Locations

Country	Name	City	State
United States	University of Pennsylvania	Philadelphia	Pennsylvania

Sponsors (3)

Lead Sponsor	Collaborator
University of Pennsylvania	National Gene Vector Laboratory, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Safety of treatment		Wtihin 28 days of administration	Yes
Secondary	Proof of concept		Within 28 days of administration	Yes