Safety and Efficacy of Diacerein 1% Ointment for Subjects With Epidermolysis Bullosa Simplex (EBS)

Study Overview
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Brief Summary
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Epidermolysis bullosa simplex (EBS) is a rare genetic skin disease characterized by fragility of the skin and mucous membranes resulting in painful blisters and erosions after minor trauma. The purpose of this study is to compare the efficacy of diacerein 1% ointment to vehicle ointment when applied once-daily for 8 weeks in subjects with EBS.

Detailed Description
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The study is an international, multicenter, randomized, double-blind, vehicle-controlled, parallel group study to evaluate the safety and efficacy of diacerein 1% ointment for the treatment of subjects with EBS. Participants were assigned to study groups receiving either diacerein 1% ointment or vehicle ointment for 8 weeks, followed by an 8 week follow-up period. Approximately 80 subjects were to be randomized to one of the 2 treatment groups. The primary objective of this study is to compare the efficacy of diacerein 1% ointment to vehicle ointment based on reduction in body surface area (BSA) of EBS lesions being treated when applied once-daily for 8 weeks in subjects with EBS. The secondary objectives are to compare the effects of diacerein 1% ointment to vehicle ointment in subjects with EBS in changes in Investigator Global Assessment (IGA) scores, pain, pruritus, mobility, and safety and tolerability.

Official Title
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An International, Multicenter, Randomized, Double-Blind, Parallel-Group Phase 2 Study Evaluating the Safety and Efficacy of Diacerein 1% Ointment Topical Formulation in Subjects With Epidermolysis Bullosa Simplex

Conditions
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Epidermolysis Bullosa Simplex

Intervention / Treatment
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* Drug: diacerein 1% ointment
* Drug: A placebo ointment


Participation Criteria
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Eligibility Criteria
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Key Inclusion Criteria: Subject is at least 4 years of age at Screening Subject has a documented genetic mutation consistent with EBS. Gene mutations acceptable for inclusion are as follows: KRT5, KRT14, PLEC1, TGM5, PKP1, DSP, FERMT1, EXPH5, DST, KLHL24. Subject has an Assessment Area of EBS lesions to be treated, that is ≥2% body surface area (BSA) and the EBS lesions are in one or both of the following body areas: Localized: plantar and/or palmar areas Generalized: arms, legs, torso, hands and feet Subject's EBS lesions in the Assessment Area have an Investigator's Global Assessment (IGA) score of ≥3 Subject/caregiver agrees to not use any topical therapies other than the study medication that might influence the status of the EBS lesions during the duration of the study Subject is non-pregnant as confirmed by a negative urine pregnancy screen, non-lactating and is not planning for pregnancy during the study period If the subject is a woman of childbearing potential, agrees to use an approved effective method of birth control Subject is in good general health and free of any known disease state or physical condition which might impair evaluation of the EBS lesions or which exposes the subject to an unacceptable risk by study participation Key Exclusion Criteria: Subject has EBS lesions to be treated that are infected Subject has used any diacerein containing product within 6 months prior to Screening Subject has used systemic immunotherapy or cytotoxic chemotherapy within 60 days prior to Screening Subject has used systemic steroidal therapy or has used topical steroidal therapy on the EBS lesions to be treated within 30 days prior to Baseline Subject has evidence of a systemic infection or has used systemic antibiotics within 7 days prior to Screening Subject is currently using systemic analgesics and/or anti-histamine therapy, for treatment of EBS lesions unless on a stable regimen (i.e., the same dosing regimen) for at least 4 weeks prior to Screening Subject has used any systemic diuretics or cardiac glycosides or any systemic product that might put the subject at undue risk Subject has used any topical product containing allantoin on the EBS lesions to be treated within 30 days prior to Screening Subject has a current malignancy, or a history of treatment for a malignancy within 2 years prior to Screening Subject currently has diabetes mellitus (HbA1c ≥6.5%) or controlled diabetes (HbA1c < 6.5%) Subject has a history of cardiac, hepatic (ALT and or AST >2x ULN, Total bilirubin >1.5x ULN at Screening), or renal disease (eGFR<30 ml/min/1.73 m^2) Subject has a non-EBS skin disease or condition (e.g., sunburn) that might put the subject at undue risk by study participation or interferes with the study medication application or the study assessments

Ages Eligible for Study
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Minimum Age: 4 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: diacerein 1% ointment<br>diacerein 1% ointment will be used for 8 weeks | Drug: diacerein 1% ointment<br>* diacerein 1% ointment administered topically<br>* Other names: CCP-020;|
| Placebo Comparator: vehicle ointment<br>vehicle ointment will be used for 8 weeks | Drug: A placebo ointment<br>* vehicle ointment administered topically<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Proportion of Subjects Who Achieved ≥ 60% Reduction in Body Surface Area (BSA) of EBS Lesions Within Assessment Area | Analysis of the proportion of subjects who achieved a ≥60% reduction in Body Surface Area (BSA) of EBS lesions within Assessment Area from Baseline to Week 8 | Baseline to Week 8 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The Proportion of Subjects Who Achieved Success on the Investigator's Global Assessment (IGA) | The investigator's global assessment (IGA) is a five-point scale that is used for overall clinical assessment of severity of disease and classifies EBS-involved skin with a score ranging from 0-4. Success on the IGA was defined as ≥2-point reduction from Baseline to Visit 6 (Week 8). IGA Scoring: 0 = Clear; 1 = Near Clear; 2 = Mild; 3 = Moderate; 4 = Severe Minimum score = 0 Maximum score = 4; higher score = worse outcome | Baseline to Week 8 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Epidermolysis, bullosa, simplex, EBS