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Observational Study of Adults and Adolescents With Erythropoietic Protoporphyria (EPP) and X-linked Porphyria (XLP) (stEPP)

28. april 2026 opdateret af: Portal Therapeutics, Inc.

Prospective Clinical Assessment Study in Adolescents and Adults With Erythropoietic Protoporphyria (EPP) and X-Linked Porphyria (XLP) (STEPP)

The purpose of this study is to collect information about the effects of EPP/XLP in adults and adolescents. This is an observational study in which participants will not receive any treatment. Study details include:

  • The study duration will be up to 6 months for each participant.
  • After Screening, participants will have a Baseline (Day 1) visit and return for visits every 4 weeks through 24 weeks.
  • Assessments to evaluate EPP/XLP will include clinical laboratory tests, physical exams, vital signs measurement, blood draws for PPIX concentration, reporting of EPP/XLP-related symptoms (including completion of a daily diary), light dosimetry.

Studieoversigt

Status

Rekruttering

Betingelser

Undersøgelsestype

Observationel

Tilmelding (Anslået)

50

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Studiesteder

  • Belgien
      • Leuven, Belgien
        • Ikke rekrutterer endnu
        • UZ Leuven
        • Kontakt:
  • Canada
  • Det Forenede Kongerige
      • Cardiff, Det Forenede Kongerige
        • Rekruttering
        • University Hospital of Wales
        • Kontakt:
      • Dundee, Det Forenede Kongerige
      • London, Det Forenede Kongerige
        • Rekruttering
        • Guy's Hospital
        • Kontakt:
      • Manchester, Det Forenede Kongerige
  • Forenede Stater
    • Massachusetts
      • Boston, Massachusetts, Forenede Stater, 02114
        • Rekruttering
        • Massachusetts General Hospital
        • Kontakt:
    • New York
      • New York, New York, Forenede Stater, 10029
        • Rekruttering
        • Mount Sinai School of Medicine
        • Kontakt:
    • North Carolina
      • Wake Forest, North Carolina, Forenede Stater, 27587
        • Rekruttering
        • Wake Forest University Baptist Health - Dept of Gastroenterology
        • Kontakt:
    • Pennsylvania
      • Philadelphia, Pennsylvania, Forenede Stater, 19121
        • Ikke rekrutterer endnu
        • Temple University
        • Kontakt:
    • Texas
      • Houston, Texas, Forenede Stater, 77030
        • Rekruttering
        • University of Texas Health - Ertan Digestive Disease Center
        • Kontakt:
  • Frankrig
      • Bordeaux, Frankrig
        • Ikke rekrutterer endnu
        • Centre Hospitalier Universitaire de Bordeaux - Hopital Saint - Andre
        • Kontakt:
      • Paris, Frankrig
        • Ikke rekrutterer endnu
        • AP-HP Hopital Bichat - Claude Bernard
        • Kontakt:
  • Italien
      • Milan, Italien
        • Ikke rekrutterer endnu
        • Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico di Milano
        • Kontakt:
      • Modena, Italien
        • Ikke rekrutterer endnu
        • Azienda Ospedaliero-Universitaria di Modena
        • Kontakt:
  • Norge
      • Bergen, Norge
        • Ikke rekrutterer endnu
        • Haukeland University Hospital
        • Kontakt:
  • Spanien
      • Madrid, Spanien
        • Rekruttering
        • Hospital Universitario 12 de Octubre
        • Kontakt:
      • Valencia, Spanien
        • Ikke rekrutterer endnu
        • Consorcio Hospital General Universitario de Valencia
        • Kontakt:
  • Tyrkiet (Türkiye)
      • Ankara, Tyrkiet (Türkiye)
        • Ikke rekrutterer endnu
        • Gazi University Faculty of Medicine
        • Kontakt:

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Barn
  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

The study design and key inclusion criteria are focused on EPP/XLP and are inclusive of all potential participants, including those from underrepresented racial and ethnic populations. The sites and countries selected have diverse populations and the potential to enroll diverse participants.

Beskrivelse

Inclusion Criteria:

  1. Aged 12 years and older.

  2. Confirmed diagnosis of EPP or XLP as follows:

    1. Genetic confirmation of EPP (FECH mutation with reduced ferrochelatase activity) OR
    2. Genetic confirmation of XLP (ALAS2 gain-of-function mutation) OR
    3. Elevated free PPIX levels in RBCs consistent with EPP/XLP, supported by clinical and/or family history.
  3. Currently has symptoms of EPP/XLP.
  4. History of consistent, non-painful prodrome within approximately 45 minutes of sunlight exposure and prior to phototoxic attacks, as self-reported by the participant.
  5. Willing and able to wear a light dosimetry device during the study.
  6. Willing and able to complete a daily diary of EPP/XLP symptoms.
  7. Willing and able to keep skin sites chosen for provocative sunlight exposure testing covered by opaque material when outside or exposed to potentially triggering light beginning 2 days prior to testing.
  8. Willing and able to provide informed consent and/or assent for the study.
  9. Study participants and LAR (as appropriate) are willing and able to comply with study visits and study procedures.

Exclusion Criteria:

  1. Diagnosis of another porphyria or another photodermatosis that may confound the characterization of EPP/XLP.
  2. Has a clinically significant disease or condition that, at the discretion of the Investigator or Sponsor, would interfere with the evaluation of EPP/XLP or study participation, or would make study participation not in the best interest of the participant.
  3. Is taking, or has taken within 60 days of Day 1, any medication, vitamin, or supplement that alters sensitivity to light exposure (eg, afamelanotide, melanotan, beta carotene, dersimelagon, or bitopertin).
  4. Concurrent or anticipated participation in an interventional clinical trial during the study period.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Plasma Protoporphyrin IX (PPIX) Levels Over Time
Tidsramme: Screening; Baseline; Weeks 4, 8, 12, 16, 20, 24
Plasma protoporphyrin IX (PPIX) concentrations measured at specified study visits.
Screening; Baseline; Weeks 4, 8, 12, 16, 20, 24
Clinical History of Phototoxic Symptoms and Prodrome Timing
Tidsramme: Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Medical history of EPP/XLP symptoms, including time to onset of prodromal sensations and occurrence of phototoxic reactions.
Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Skin Damage Manifestations
Tidsramme: Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Skin damage manifestations associated with EPP/XLP, including swelling, erythema, and chronic skin changes.
Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Light Exposure and Phototoxic Reaction Data From Daily Diary
Tidsramme: Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Daily recorded light exposure (including time spent outdoors), light dosimetry measurements, and occurrence of phototoxic reactions as captured in participant diaries.
Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Sunlight Exposure Required to Induce Prodromal Symptoms
Tidsramme: Baseline and Weeks 4, 8, 12, 16, 20
Amount of sunlight exposure associated with onset of prodromal symptoms, along with corresponding plasma protoporphyrin IX (PPIX) levels.
Baseline and Weeks 4, 8, 12, 16, 20

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Liver Function Test Results
Tidsramme: Baseline and Weeks 4, 8, 12, 16, 20, 24
Blood levels of liver function parameters (e.g., alanine aminotransferase [ALT], aspartate aminotransferase [AST], bilirubin) and corresponding plasma protoporphyrin IX (PPIX) levels.
Baseline and Weeks 4, 8, 12, 16, 20, 24

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Portal Therapeutics, Inc.

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

30. april 2026

Primær færdiggørelse (Anslået)

1. marts 2027

Studieafslutning (Anslået)

1. april 2027

Datoer for studieregistrering

Først indsendt

15. april 2026

Først indsendt, der opfyldte QC-kriterier

28. april 2026

Først opslået (Faktiske)

5. maj 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

5. maj 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

28. april 2026

Sidst verificeret

1. april 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • PORT-77-001

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

JA

IPD-planbeskrivelse

What may be shared:

De-identified individual participant data (no direct identifiers)

Who can access it:

Qualified researchers with a scientifically sound research proposal

Conditions for access:

Submission and approval of a research proposal Execution of a data sharing agreement (DSA) Compliance with privacy regulations (e.g., GDPR, HIPAA as applicable)

How it will be shared:

Through a secure data access process managed by the sponsor or designated data-sharing platform

Timing:

Typically after study completion and/or publication of primary results

Purpose:

To support further research on EPP and XLP while protecting participant confidentiality

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

Kliniske forsøg med Erytropoietisk protoporfyri (EPP)

Søg i lignende forsøg

Sponsorer og samarbejdspartnere

Medicinske tilstande

Narkotikainterventioner

CROs by country

CROs in Kenya

Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

Abonner