Expanded Access Program of Bitopertin For Participants With EPP or XLP

May 18, 2026 updated by: Disc Medicine, Inc

Expanded Access Program Protocol: Bitopertin (DISC-1459) For The Treatment of Erythropoietic Protoporphyria (EPP) and X-Linked Protoporphyria (XLP)

The goal of this expanded access program is to provide bitopertin to patients with EPP and XLP who have no satisfactory treatment options available in the US and to learn if bitopertin is safe to treat EPP and XLP.

Study Overview

Status

Temporarily not available

Conditions

Intervention / Treatment

Study Type

Expanded Access

Expanded Access Type

  • Intermediate-size Population

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

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

N/A

Description

Inclusion Criteria:

  • Written informed consent (and assent where applicable).
  • Age ≥12 years at time of request.
  • Diagnosis of erythropoietic protoporphyria (EPP) or X-linked protoporphyria (XLP), confirmed by ferrochelatase (FECH) or aminolevulinic acid synthase 2 (ALAS2) genotyping or by biochemical porphyrin analysis. Prior confirmation is acceptable; re-testing is not required if documentation of prior diagnosis is available.
  • Hemoglobin ≥10 g/dL at baseline.
  • Females of childbearing potential must have a negative pregnancy test prior to enrollment.

Exclusion Criteria:

  • Known hypersensitivity to bitopertin or its excipients.
  • Patients with AST or ALT ≥3 × upper limit of normal (ULN), or total bilirubin ≥2 × ULN (unless due to Gilbert syndrome), or albumin below the lower limit of normal at screening.
  • Patients with a history of liver transplantation or anticipated need for liver transplantation.
  • Pregnancy, planned pregnancy during the program, or breastfeeding.
  • Inability or unwillingness to comply with contraception requirements.

  • Use of any of the following prohibited concomitant therapies:

    • Strong CYP3A4 inhibitors
    • Strong CYP3A4 inducers
    • Grapefruit or Seville orange products
    • Afamelanotide or dersimelagon
    • Chronic opioid therapy (>7 consecutive days)
  • Patients who are currently participating in a bitopertin clinical study.
  • Patients who previously participated in a bitopertin study and discontinued the study due to an adverse event or for reasons that, in the judgement of the treating physician or Disc, would put the patient at unacceptable risk or otherwise preclude participation in the EAP.
  • Patients who have received another investigational therapy within 30 days.
  • History of suicidal ideation with intent (C-SSRS Grade 4 or 5) within the past year or suicidal behavior within the past 5 years.

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?

Collaborators and Investigators

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

Sponsor

Disc Medicine, Inc

Investigators

  • Study Director: Will Savage, MD, PhD, Disc Medicine

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 Registration Dates

First Submitted

May 18, 2026

First Submitted That Met QC Criteria

May 18, 2026

First Posted (Actual)

May 22, 2026

Study Record Updates

Last Update Posted (Actual)

May 22, 2026

Last Update Submitted That Met QC Criteria

May 18, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • DISC-1459-EAP-US

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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