An International, Multicenter, Randomized, Double-Blind, Parallel Group, Vehicle-Controlled, Phase 2/3 Study With Open-Label Extension Evaluating the Efficacy and Safety of Diacerein 1% Ointment for the Treatment of Generalized Epidermolysis Bullosa Simplex (EBS)

Last updated: April 8, 2025
Sponsor: TWi Biotechnology, Inc.
Overall Status: Active - Recruiting

Phase

2/3

Condition

Epidermolysis Bullosa

Pemphigus Vulgaris (Pv)

Treatment

AC-203

Vehicle

Clinical Study ID

NCT06073132
AC-203-EBS-007
  • Ages > 6
  • All Genders

Study Summary

The proposed Phase 2/3 trial with double-blind and open-label extension phases is an international, multicenter study designed to assess the efficacy and safety of diacerein 1% ointment in patients with generalized EBS.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Patient is at least 6 months old at Visit 2 (Day 1/Baseline A). (Note: Enrollment ofpatients under 4 in the EU is pending approval of the safety review for 10 patientsaged 4-12.)

  2. Patients has been clinically diagnosed with severe EBS or intermediate EBS,confirmed by documented genetic diagnosis to have autosomal dominant mutations inKRT5 or KRT14 gene.

  3. Patient with ≥ 3% BSA of EBS lesions excluding palms and soles at Visit 2 (Day 1/Baseline A).

  4. Patient's EBS lesions within the Treatment Area have an IGA score of ≥3 at Visit 2 (Day 1/Baseline A).

  5. Patient/caregiver agrees to follow study medication application instructions.

  6. Patient (and caregiver/legal guardian) agrees to report use of all prescription andover-the-counter medications, including topical therapies applied to the body, e.g.,medical cleansers, bleach cleansers, bleach baths, topical antiseptics, topicaldisinfectants, etc. for the duration of the study.

  7. Patient (and caregiver/legal guardian) is willing and able to comply with all studyvisits and all the protocol requirements, including completing questionnaires.

  8. Patient (and caregiver/legal guardian) is able to provide written informed consent;assent based on age.

  9. Female patient of childbearing potential must have a negative pregnancy test priorto randomization.

  10. Female patient of childbearing potential is willing to practice highly effectivecontraception (i.e., pregnancy prevention method with a failure rate of < 1% peryear) from Screening throughout the end of the study.

Exclusion

Exclusion Criteria:

  1. Patient has a clinically significant skin disease other than EBS (e.g., psoriasis,atopic dermatitis, eczema, sun damage, etc.), or a vascular disorder associated withcutaneous erosions/ulcerations, that may confound assessments of efficacy or safety.

  2. Patient has a clinically significant underlying medical condition, psychiatriccondition (such as major depressive or psychotic disorder, severe intellectualdisability, or alcohol or drug use disorder), or requires concomitant medicationthat based on the investigator's judgement may impair evaluation of the TreatmentArea or exposes the patient to an unacceptable risk by study participation.

  3. Patient has used any diacerein-containing product within 6 months prior to Visit 2 (Day 1/Baseline A).

  4. Patient has had a cutaneous infection in the Treatment Area or use systemicantibiotics within 7 days prior to Visit 2 (Day 1/Baseline A).

  5. Patient has uncontrolled diabetes mellitus (HbA1c ≥ 6.5%), hepatic enzymeabnormalities (alanine aminotransferase or aspartate aminotransferase >2.5 the upperlimit of normal (ULN), or total bilirubin >2.0x ULN), or renal abnormalities (estimated glomerular filtration rate [eGFR]< 30 ml/min/1.73 m2) during theScreening period.

  6. Patient has a current malignancy, or a history of treatment for a malignancy within 5 years (with the exception of treated non-melanoma cutaneous malignancy e.g.,surgically resected with clear margins) prior to Visit 2 (Day 1/Baseline A).

  7. Patient is treated with protocol-excluded topical therapies other than steroidswithin 2 weeks prior to Visit 2 (Day 1/Baseline A) that might influence theassessment of the Treatment Area throughout the study period.

  8. Patient has been treated with topical steroids on the EBS lesions within 2 weeks orsystemic steroids within 4 weeks. prior to Visit 2 (Day 1/Baseline A). (Note:inhaled and ophthalmic products containing steroids are allowed.)

  9. Patient has been treated with: (a) an approved biologic anti-inflammatory therapy (such as monoclonal antibodies that target to modulate the immune responses) and (b)other immunosuppressive/immunomodulatory therapies or chemotherapy within 8 weeksprior to Visit 2 (Day 1/Baseline A).

  10. Patient has been treated with any investigational drug or device within 30 days or 5half-lives, whichever is longer, prior to Visit 2 (Day 1/Baseline A).

  11. Patient has a history of allergy or hypersensitivity to any component of studymedications, including diacerein or rhein.

  12. Patient is pregnant or breastfeeding/lactating.

  13. Patient has a planned or anticipated major surgical procedure or other activity thatwould interfere with their ability to comply with protocol requirements.

Study Design

Total Participants: 80
Treatment Group(s): 2
Primary Treatment: AC-203
Phase: 2/3
Study Start date:
April 04, 2024
Estimated Completion Date:
March 31, 2026

Study Description

Epidermolysis bullosa simplex (EBS) is a genetic skin disorder characterized by skin fragility and recurrent blister formation, primarily caused by mutations in keratins 5 and 14. EBS has 3 common subtypes based on clinical severity and manifestations: localized EBS, intermediate EBS and severe EBS. Severe EBS and intermediate EBS collectively are also known as generalized EBS due to widespread blistering.

Disruption of the keratin 5/14 filament network in basal keratinocytes is a key factor in EBS pathogenesis, compromising skin integrity. The severity of EBS is linked to the extent of keratin mutations disrupting this network, particularly resulting in keratin aggregates in severe cases. Recent studies suggest that mutated keratin proteins can trigger inflammation, exacerbating EBS. Elevated proinflammatory cytokines, like IL-1β and IL-6, are observed in EBS patients, and IFN-γ may mediate inflammation, promoting keratin aggregations. As a result, targeting inflammation is considered a potential therapeutic approach in EBS.

AC-203 (diacerein 1% ointment) is a topical formulation of diacerein, well-known for its ability to inhibit IL-1β and other proinflammatory cytokines. Moreover, diacerein and its active metabolite, rhein, have demonstrated ability in reducing keratin aggregates in keratinocytes derived from severe EBS. Taken together, with its anti-inflammatory property and ability to diminish keratin aggregation, AC-203 shows promise in reducing the clinical severity of EBS.

Connect with a study center

  • Premier Specialists

    Kogarah,
    Australia

    Active - Recruiting

  • Sydney Children's Hospital

    Randwick,
    Australia

    Active - Recruiting

  • Universitaetsklinik fuer Dermatologie und Allergologie

    Salzburg,
    Austria

    Active - Recruiting

  • UZ Leuven

    Leuven,
    Belgium

    Active - Recruiting

  • Hopital Necker-Enfants Malades

    Paris,
    France

    Active - Recruiting

  • Hospital of Skin and Venereal Diseases of Thessaloniki

    Thessaloniki,
    Greece

    Site Not Available

  • Children's Health Ireland

    Dublin,
    Ireland

    Site Not Available

  • Tel Aviv Sourasky Medical Center

    Tel Aviv,
    Israel

    Active - Recruiting

  • IRCCS, AOUBO, Policlinico Sant'Orsola

    Bologna,
    Italy

    Site Not Available

  • Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milano

    Milan,
    Italy

    Active - Recruiting

  • Università degli Studi di Modena e Reggio Emilia (UNIMORE)

    Modena,
    Italy

    Site Not Available

  • Istituto Dermopatico dell'Immacolata (IDI) - Istituto di

    Rome,
    Italy

    Active - Recruiting

  • UOS "Centro delle Dermatosi Croniche Complesse e Genodermatosi" UOC Dermatologia

    Rome,
    Italy

    Active - Recruiting

  • Gangnam Severane Hospital

    Seoul,
    Korea, Republic of

    Active - Recruiting

  • Hospital Tunku Azizah (Hospital Wanita Dan Kanak-kanak Kuala Lumpur)

    Kuala Lumpur,
    Malaysia

    Active - Recruiting

  • Southern Philippines Medical Center (SPMC)

    Davao,
    Philippines

    Site Not Available

  • Iloilo Doctors Hospital

    Iloilo,
    Philippines

    Active - Recruiting

  • Health Cube Medical Clinics

    Mandaluyong,
    Philippines

    Active - Recruiting

  • Asian Hospital

    Muntinlupa,
    Philippines

    Active - Recruiting

  • OT.CO Clinic Osipowicz & Turkowski

    Warsaw,
    Poland

    Active - Recruiting

  • Hospital Universitario La Paz

    Madrid,
    Spain

    Site Not Available

  • National Cheng Kung University Hospital

    Tainan,
    Taiwan

    Active - Recruiting

  • Sheikh Khalifa Medical City (SKMC)

    Abu Dhabi,
    United Arab Emirates

    Site Not Available

  • Great Ormond Street Hospital (GOSH) for Children NHS Foundation Trust - Somers Clinical Research Facility (CRF)

    London,
    United Kingdom

    Active - Recruiting

  • University Hospitals Birmingham NHS Foundation Trust (UHB)

    Solihull,
    United Kingdom

    Active - Recruiting

  • Mission dermatology Center

    Rancho Santa Margarita, California 92688
    United States

    Active - Recruiting

  • Stanford University

    Stanford, California 94304
    United States

    Active - Recruiting

  • Children's Hospital Colorado

    Aurora, Colorado 80045
    United States

    Active - Recruiting

  • Pediatric Center of Excellence (PCE) - Miami Pediatric Endocrinology, LLC

    Miami, Florida 33146
    United States

    Active - Recruiting

  • Northwestern University - Lurie Childrens's Hospital

    Chicago, Illinois 60611
    United States

    Active - Recruiting

  • Stony Brook Dermatology

    Stony Brook, New York 11790
    United States

    Active - Recruiting

  • Cincinnati Childrens Hospital

    Cincinnati, Ohio 45229
    United States

    Active - Recruiting

  • Medical University of South Carolina

    Charleston, South Carolina 29425
    United States

    Active - Recruiting

  • Texas Dermatology and Laser Specialists

    San Antonio, Texas 78218
    United States

    Active - Recruiting

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