Assessing the Efficacy of Anti-staphylococcal Phages in the Management of Infected Foot Ulcers in Diabetes

University Hospitals of Derby and Burton NHS Foundation Trust

Overview

Work Package 1: Observational cohort pilot safety study Work Package 2: Randomised, double-blind, placebo controlled pilot study Work Package 3: Observer-blind pilot RCT

Work Package 1 WP1 is a safety cohort pilot study targeting patients with DFU which are non-infected as determined by the IDSA criteria. 20 participants will be recruited from Diabetic Foot Clinic at the Royal Derby Hospital. Phage gel will be applied to the index ulcer after the first and second sets of measures at baseline, weeks 1, 2 and 3. Samples will be taken at baseline and weekly up to 4 weeks by surface swab and deep tissue sample for determination of bacterial colonisation using both conventional and genotypic (molecular) microbiological methods, prior to any IMP application. Work Package 2 WP2 is a pilot double blind, placebo-controlled, randomised study targeting patients with mild or moderate infection of DFUs and comparing systemic antibiotic therapy plus phage gel against systemic antibiotics therapy plus placebo gel. A total of 50 participants from two centres (foot clinics at Royal Derby Hospital and City Campus, Nottingham University Hospitals NHS Trust) will be recruited. Phage gel or placebo will be applied to the index ulcer after the first and second sets of measures at baseline, weeks 1, 2 and 3. Samples will be taken at baseline and weekly up to 4 weeks by surface swab and deep tissue sample for determination of bacterial colonisation using both conventional and genotypic (molecular) microbiological methods Work Package 3 WP3 is an observer-blind RCT targeting patients with mild diabetic foot infection by IDSA criteria and comparing phage gel with systemic antibiotics. A total of 50 participants from two centres (foot clinics at Royal Derby Hospital and City Campus, Nottingham University Hospitals NHS Trust) will be recruited. Those with moderately severe infections will be withheld from this work package because of the clinical and ethical issues associated with withholding antibiotics in those with a moderately severe infection.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

TRIPLE

Conditions

Diabetes Diabetic Foot Diabetic Foot Infection

Interventions

PhageDRUG

The studies will be undertaken using a cocktail of at least 2-3 anti-staphylococcal phages produced by Intralytix Inc, Baltimore, Maryland, USA. The phages will be included in a gel designed for application directly to the wound surface and packaged in 5 ml single use tubes.

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. Diabetes Mellitus according to WHO criteria 2. are aged 18 years or over 3. Additionally, patients must meet one of the following criteria to participate in the described Work Package: * Patients are only eligible for WP1 if they also have one or more DFUs (area 25mm2) below the malleoli without infection according to IDSA criteria that have been present for at least 4 weeks * Patients are only eligible for WP2 if they also have one or more DFUs (area 25mm2) below the malleoli with mild or moderate infection according to IDSA criteria that have been present for at least 4 weeks * Patients are only eligible for WP3 if they also have one or more DFUs (area 25mm2) below the malleoli with mild infection according to IDSA criteria that have been present for at least 4 weeks Exclusion Criteria: We will exclude patients who meet ANY of the following criteria: 1. with mental incapacity to give informed consent, 2. who have other major co-morbidities, which in the opinion of the investigator would mean that the patient would not be able to complete the study 3. with significant peripheral arterial disease (PAD): ABPI (ankle brachial pressure index) \<0.7, 4. Who have osteomyelitis defined by agreed clinical criteria 5. who are receiving treatment with systemic glucocorticoids or other immunosuppressants, 6. who have received systemic or topical antibiotics in the preceding 14 days, 7. who are judged to require parenteral administration of antibiotics, 8. Who have been previously recruited to an earlier part of the project 9. who are women of childbearing age who are at risk of conception 10. History of antibiotic hypersensitivity

Locations (1)

University Hospitals Derby and Burton NHS Foundation Trust

Derby, Derbyshire, United Kingdom

Outcomes

Primary Outcomes

Work Package 1: To assess the safety of the use of anti-staphylococcal phages therapy on the wound bacterial microbiome of uninfected DFU's.

\- Safety : Clinically significant change in safety bloods, vital signs, Full Blood Count (FBC), renal function, C-Reactive protein (CRP), Liver function Tests (LFT)s, Adverse events

Time frame: 7 months

Work Package 2

To compare the effect on the microbiome of empirical systemic antibiotic therapy alone (ESAT) versus ESAT plus phage therapy in ulcers complicated by mild or moderate infection as assessed by IDSA criteria

Time frame: 16 months

Work Package 3

To compare the use of empirical systemic antibiotic therapy versus phage therapy in ulcers complicated by mild infection on the eradication of the infection as assessed by IDSA criteria.

Time frame: 16 months

Secondary Outcomes

Work Package 1: Safety of phage gel and overt toxic effect of phage gel.

The following outcomes will be recorded at weekly intervals for 4 weeks from baseline: 1. Incidence of new infection 2. Number of days of antibiotic usage 3. Change in surface microbiome 4. Adverse events 5. Change in safety bloods, vital signs, FBC, renal function, CRP, LFTs 6. Wound status (clinical infection, area, depth, extent of surface slough, pain by VAS, peri ulcer appearance) 7. Patient well-being using a Visual Analogue Scale, 0-100mm. 8. Vital signs (Resting pulse and blood pressure (BP))

Time frame: 7 months

Work Package 1: • Impact on the bacterial microbiome of anti-staphylococcal phage gel and systemically chosen antibiotics.

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.

Time frame: 7 months

Work Package 2: Safety of phage gel and overt toxic effect of phage gel.

The following outcomes will be recorded at weekly intervals for 4 weeks from baseline: 1. change in surface microbiome 2. Number of antibiotic-free days 3. Adverse events 4. Change in safety bloods, vital signs, FBC, renal function, CRP, LFTs 5. Wound status (clinical infection, area, depth, extent of surface slough, pain by VAS, peri ulcer appearance) 6. Patient well-being using a Visual Analogue Scale, 0-100mm. 7. Eradication of clinical evidence of the infection in the index ulcer at weeks 1, 2 and 3, and time to eradication 8. Healing of all ulcers and time to healing 9. Resting pulse and blood pressure (BP)

Time frame: 7 months

Work Package 2: Clinical benefit and patient well-being associated with adding phage gel to systemically chosen antibiotics compared to placebo in the management of mild or moderate infection.

Time frame: 16 months

Work Package 2: Impact on the bacterial microbiome of systemically chosen antibiotics and of anti-staphylococcal phage gel.

Time frame: 16 months

Work Package 3: Safety of phage gel and overt toxic effect of phage gel.

The following outcomes will be recorded at weekly intervals for 4 weeks from baseline: 1. Change in surface microbiome 2. Number of antibiotic-free days 3. Adverse events 4. Change in safety bloods, FBC, renal function, CRP, LFTs 5. Wound status (clinical infection, area, depth, extent of surface slough, pain by VAS, peri ulcer appearance) 6. Patient well-being using a Visual Analogue Scale, 0-100mm. 7. Eradication of clinical evidence of the infection in the index ulcer at weeks 1, 2 and 3, and time to eradication 8. Healing of all ulcers and time to healing 9. Resting pulse and blood pressure (BP)

Time frame: 16 months

Work Package 3: Clinical benefit and patient well-being associated with phage gel therapy compared to systemically chosen antibiotics in the management of mild infection.

Time frame: 16 months

Work Package 3: Impact on the bacterial microbiome of systemically chosen antibiotics and of anti-staphylococcal phage gel.

Time frame: 16 months