Evaluating The Efficacy Of A Keratin Graft In Treating Non-Healing Diabetic Foot Ulcers

ProgenaMatrix® is a human keratin graft that is 510K approved for application on diabetic foot wounds and has been shown in case studies and clinical practice to assist in wound healing . Additionally, a study published by Tang and Kirsner showed that keratin stimulates human keratinocyte migration and types IV and VII collagen expression. Therefore, based on this early promising data, a larger pilot is necessary to further validate these results and identify the likelihood of wound healing with weekly versus bi-weekly application. For consistency, one type of wound will be studied in this trial and DFU's have been chosen as they are some of the most common wounds seen in the wound clinics.

The purpose of this clinical evaluation is to collect patient outcome data on a commercially available 510K FDA cleared synthetic, absorbable skin substitute matrix. The commercially available product is ProgenaMatrix® Advanced Wound Graft and consists of Human Keratin Matrix. In this trial, two groups of subjects with diabetic foot ulcers (DFUs), will receive standard of care (SOC) treatment for their condition. Half of the patients will be randomized to a 510K FDA cleared ProgenaMatrix® applied weekly and the other half will be randomized to a 510K FDA cleared ProgenaMatrix® applied bi-weekly (i.e., once every two weeks).

Inclusion criteria

• Diagnosis of type 1 or 2 diabetes mellitus
• Target diabetic foot ulcer with a minimum surface area of 1.0 cm^2 and a maximum surface area of 20.0 cm^2 measured post-debridement with photographic planimetry.
• Target ulcer must have been present for a minimum of 4 weeks and maximum of 52 weeks of standard of care prior to initial screening
• Target ulcer must be located on the foot with at least 50% of its area below the malleolus
• Target ulcer must be full thickness on the foot or ankle that does not probe to bone
• Adequate circulation in the affected foot documented within 3 months of initial screening visit, as determined by one of the following: transcutaneous oximetry measurement (TCOM) greater or equal to 30 mmHg, ankle-brachial index (ABI) between 0.7 and 1.3, biphasic pulse volume recording (PVR), toe-brachial index (TBI) greater than 0.6, or arterial Doppler ultrasound evaluating for biphasic dorsalis pedis and posterior tibial vessels at the ankle level
• If subject has two or more ulcers, they must be separated by at least 2 cm. The largest ulcer satisfying the inclusion and exclusion criteria will be designated as the target ulcer
• Target ulcers on the plantar aspect of the foot must be offloaded for at least 14 days prior to randomization
• Subject must consent to using the prescribed off-loading method for the duration of the study
• Subject must agree to attend weekly study visits required by the protocol
• Subject must be willing and able to participate in the informed consent process

Exclusion criteria

• Subjects known to have a life expectancy of < 6 months
• Infection of the target ulcer or cellulitis in the surrounding skin
• Presence of osteomyelitis or exposed bone, or wounds that probe to bone or joint capsule on investigator's exam or radiographic evidence
• Infection in the target ulcer requiring systemic antibiotic therapy
• Subjects receiving immunosuppressants (including systemic corticosteroids > 10 mg Prednisone per day or equivalent) or cytotoxic chemotherapy
• Topical application of steroids to the ulcer surface within one month of initial screening
• Subjects with previous partial amputation on the affected foot that impedes proper offloading of the target ulcer
• Subjects with a glycated hemoglobin (HbA1c) greater than or equal to 13% taken at or within 3 months of the initial screening visit
• Subjects with a serum creatinine level ≥ 3.0mg/dL within 6 months of randomization
• Surface area of the target ulcer reduces in size by more than 30% in the two weeks between the initial screening and randomization during which they are subject to standard of care
• Subjects with acute or inactive Charcot foot that impedes proper offloading of the target ulcer
• Women who are pregnant or considering becoming pregnant within the next 6 months
• Subjects with end stage renal disease requiring dialysis
• Subjects who participated in a clinical trial involving treatment with an investigational product within the previous 30 days
• Subjects who, in the opinion of the investigator, have a medical or psychological condition that may interfere with study assessments
• Subjects treated with hyperbaric oxygen therapy or a cellular and/or tissue product (CTP) in the 30 days prior to the initial screening visit