Study of a Topical Gentamicin-Collagen Sponge Along With Systemic Antibiotic in Infected Diabetic Foot Ulcers



Status:Active, not recruiting
Conditions:Infectious Disease, Gastrointestinal, Podiatry, Diabetes
Therapuetic Areas:Endocrinology, Gastroenterology, Immunology / Infectious Diseases, Orthopedics / Podiatry
Healthy:No
Age Range:18 - 85
Updated:6/9/2016
Start Date:May 2015
End Date:August 2016

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A Phase 3 Randomized, Placebo-Controlled, Blinded Study to Investigate the Safety and Efficacy of a Topical Gentamicin-Collagen Sponge in Combination With Systemic Antibiotic Therapy in Diabetic Patients With an Infected Foot Ulcer

This is a phase 3, randomized, controlled, blinded, multicenter study conducted in 3
parallel cohorts of diabetic patients with at least 1 infected foot ulcer. Patients will be
randomized to receive 1 of 3 study treatments; systemic antibiotic therapy and standard
ulcer care with either (A) daily application of a gentamicin-sponge, (B) daily application
of a placebo-sponge or (C) no-sponge, in the ratio 2:1:1.

Patients will be treated for approximately 28 days and return to the clinic weekly for
safety and efficacy assessments. After completing treatment, patients will return to the
clinic for scheduled follow-up visits approximately 10, 30, 60 and 90 days after treatment
is stopped.

This is a phase 3, randomized, controlled, blinded, multicenter study conducted in 3
parallel cohorts of diabetic patients with at least 1 infected foot ulcer. Patients will be
randomized using an electronic randomization system to receive 1 of 3 study treatments;
systemic antibiotic therapy and standard ulcer care with either (A) daily application of a
gentamicin-sponge, (B) daily application of a placebo-sponge or (C) no-sponge, in the ratio
2:1:1. The investigator will be blinded to the patient's treatment group assignment and
patients randomized to one of the 2 sponge groups will be blinded as to whether the sponge
is active or placebo.

If a patient has multiple infected ulcers, the assigned treatment will be administered to
all infected ulcers. The investigator will determine the highest severity ulcer to be used
for all efficacy evaluations and will also determine the size and number of sponges (up to
4) that a patient will use in order to completely cover all infected ulcers. The
investigator will prescribe an empiric systemic antibiotic therapy based on protocol
instructions.

Patients will be treated for approximately 28 days and return to the clinic weekly for
safety and efficacy assessments. The investigator will stop study treatment if a patient
achieves clinical cure by or after the 3rd treatment visit (approximately study day 15).
After completing treatment, patients will return to the clinic for scheduled follow-up
visits or until ulcer closure. The final efficacy assessments used in the primary efficacy
analyses will be obtained at the first follow-up visit approximately 10 days after treatment
is stopped. The remaining follow-up visits will occur at approximately 30, 60 and 90 days
after treatment is stopped when patients will be assessed for ulcer closure and any
re-infection.

Inclusion Criteria:

- Has diabetes mellitus, according to the American Diabetes Association (ADA) criteria.

- Has at least 1 skin ulcer located on or below the malleolus that presents with the
following clinical manifestations of a moderate or severe infection based on the
Infectious Disease Society of America guidelines for the "Diagnosis and Treatment of
Diabetic Foot Infections" (CID 2012; 54:132-173) (IDSA guidelines):

- has ≥ 2 manifestations of inflammation (local swelling or induration, erythema,
local tenderness or pain, local warmth, purulent discharge (thick, opaque to
white or sanguineous secretion)

- has ≥ 1 of the following characteristics: erythema > 2cm, or involving
structures deeper than skin and subcutaneous tissues (e.g. abscess,
osteomyelitis, septic arthritis, fasciitis) For patients with multiple infected
ulcers, the ulcer with the highest Diabetic Foot Infection Wound score (DFI
score) must be on or below the malleolus and all infected ulcers must be
completely coverable using no more than 4 sponges (sponges cannot be cut).

- Has documented adequate arterial perfusion in the affected limb(s) (either palpable
dorsalis pedis and posterior tibial pulses, or normal Doppler wave forms, a toe blood
pressure ≥ 45 mm Hg or participation is approved by a vascular surgeon)

- Has received appropriate surgical intervention to remove all necrotic and infected
bone if diagnosed with osteomyelitis.

- Has received appropriate surgical debridement to remove all gangrenous tissue.

Exclusion Criteria:

- Has a known history of hypersensitivity to gentamicin (or other aminoglycosides).

- Has a known or suspected hypersensitivity to bovine collagen.

- Has an ulcer infection which, based upon the patient's known history of
hypersensitivity and/or as otherwise in the opinion of the investigator, cannot be
adequately treated with at least one of the empiric systemic antibiotic regimens
allowed by this protocol.

- Has an ulcer associated with prosthetic material or an implanted device.

- Has received any systemic or topical antibiotic therapy for any reason within 7 days
of randomization unless it was administered to specifically treat the infected
ulcer(s) and only within 36 hours of randomization.

- Requires or is likely to require treatment with any concomitant topical product or
wound therapy before the first follow-up study visit.

- Is severely immunocompromised, or likely to become severely immunocompromised during
the study, in the opinion of the investigator.

- Has a history of myasthenia gravis or other neurological condition where gentamicin
use is contraindicated as determined by the investigator.

- Has a history of epilepsy.

- Has a history of alcohol or substance abuse in the past 12 months.

- Has an uncontrolled illness that, in the opinion of the investigator, is likely to
cause the patient to be withdrawn from the trial or would otherwise interfere with
interpreting the results of the study
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