A Study to Assess the Incidence of Skin Cancers in Patients With Epidermolysis Bullosa Receiving Filsuvez (FOSteR)

September 18, 2025 updated by: Amryt Pharma

A Long-term Non-interventional Study to Assess the Incidence of Skin Malignancies in Patients With Dystrophic and Junctional Epidermolysis Bullosa Receiving Treatment With Filsuvez

In patients with epidermolysis bullosa (EB), collagen does not form properly, so their skin is very fragile and blisters easily. Such patients are also at greatly increased risk of developing skin cancers. Filsuvez is a topical gel used to promote healing of skin lesions in patients with certain types of EB. In this observational study, patients with either dystrophic EB (DEB) or junctional EB (JEB) will receive standard of care treatment, whether Filsuvez or something else, and will be followed for up to 5 years. The main purpose is to see if the use of Filsuvez affects the likelihood of developing skin malignancies in these patient populations.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Some forms of EB are associated with a greatly increased incidence of aggressive skin and mucosal squamous cell carcinoma (SCC), as well as increased incidence of other skin malignancies including basal cell carcinoma (BCC) and malignant melanoma (MM). This long-term non-interventional study will assess all types of skin malignancies (SCC, BCC, and MM) in DEB and JEB patients. It is an observational study of real-world treatment practices, in which patients will receive standard of care therapy whatever that may entail. Data will be obtained from two sources: clinical study centers in the European Union (EU) and the United Kingdom (UK), and pre-existing EB registries in the EU. Participants will be followed for up to 5 years, and information about the development and nature of skin malignancies will be collected over this time period both from patients who are taking and those who are not taking Filsuvez.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
580

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • France
      • Toulouse, France
        • Recruiting
        • CHU de Toulouse, Hôpital Larrey
        • Contact:
        • Principal Investigator:
          • Juliette Mazereeuw Hautier
  • Greece
      • Thessaloniki, Greece
        • Recruiting
        • Hospital Of Skin And Venereal Diseases of Thessaloniki
        • Contact:
        • Principal Investigator:
          • Dimitra Kiritsi
  • Spain
      • Barcelona, Spain
        • Recruiting
        • Hospital Clinic, Barcelona
        • Contact:
        • Principal Investigator:
          • Josep Riera Monroig
      • Barcelona, Spain
        • Recruiting
        • Hospital San Juan de Dios (Barcelona)
        • Contact:
        • Principal Investigator:
          • Asuncion Vicente
  • United Kingdom
      • London, United Kingdom
        • Recruiting
        • Guy's and St Thomas' NHS Foundation Trust
        • Contact:
        • Principal Investigator:
          • Jemima Mellerio

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Patients with dystrophic EB or junctional EB, whether they are receiving Filsuvez, receiving another treatment for EB, or not receiving any treatment.

Description

Inclusion Criteria:

  • Patients with a confirmed diagnosis of dystrophic EB or junctional EB

Exclusion Criteria:

  • None

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Patients with dystrophic or junctional EB being treated with Filsuvez
Patients in this cohort will be receiving treatment with Filsuvez for their EB.
Drug: Filsuvez
Topical gel
Other Names:
  • Birch bark extract
Patients with dystrophic or junctional EB not being treated with Filsuvez
Patients in this cohort will be receiving treatment other than Filsuvez or no treatment at all for their EB.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Incidence of first skin malignancy during follow-up in EB patients receiving Filsuvez
Time Frame: Up to 5 years
Patients being treated with Filsuvez will be followed for occurrence of skin malignancies from the date of study enrolment until either the date of discontinuation (withdrawal of consent, withdrawal from the site or registry, physician decision, death, or lost to follow-up) or termination of the study
Up to 5 years

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Incidence of first skin malignancy during follow-up in EB patients not receiving Filsuvez
Time Frame: Up to 5 years
Patients with EB who are not being treated with Filsuvez will be followed for occurrence of skin malignancies from the date of study enrolment until either the date of discontinuation (withdrawal of consent, withdrawal from the site or registry, physician decision, death, or lost to follow-up) or termination of the study
Up to 5 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Amryt Pharma

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Chiesi Farmaceutici S.p.A.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 18, 2024

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
November 30, 2031

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
August 1, 2032

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 16, 2024

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 16, 2024

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 21, 2024

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 19, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 18, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • AEB-21

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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