Denne side blev automatisk oversat, og nøjagtigheden af ​​oversættelsen er ikke garanteret. Der henvises til engelsk version for en kildetekst.

Erhvervet hæmofili A og autoimmunitet. Undersøgelse af lymfocytpopulationer og myeloid-afledte suppressorceller (IMMUNHEMAC)

23. september 2026 opdateret af: Nantes University Hospital

Acquired hemophilia A is a rare condition of hemostasis secondary to the development of antibodies against factor VIII. This is a potentially serious pathology that can be life-threatening due to the major risk of bleeding caused by the sometimes drastic decrease in the level of circulating factor VIII.

This pathology occurs overwhelmingly in elderly subjects or, more rarely, in young women, during the postpartum period. It appears idiopathic in 50% of cases and associated, for the other cases, with underlying pathologies such as autoimmune pathologies (rheumatoid arthritis and bullous pemphigoid in particular) and neoplasias, or with a particular circumstance represented by the post -partum.

The association between this autoimmune pathology and its association with pathologies of the same type or with circumstances involving the immune system, suggests that common mechanisms could favor its emergence.

This study therefore proposes to study lymphocyte populations and subpopulations as well as Myeloid-Derived Suppressor Cells and the cytokine profile, which are abnormal in a large part of autoimmune pathologies.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

36

Kontakter og lokationer

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

Studiesteder

      • Nantes, Frankrig
        • CHU de Nantes
      • Saint-Nazaire, Frankrig
        • CH de Saint Nazaire

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

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Patients with acquired hemophilia A will be recruited prospectively when diagnosed with acquired hemophilia A and will be followed in the study until recovery.

Patients with constitutional hemophilia A will be recruited prospectively. They should be over 50 years old and have severe or moderate hemophilia A, and not be taking any treatment that could interfere with the immune system or inflammatory markers.

Population of control subjects without coagulation abnormalities, over 60 years of age and not taking any treatment likely to interfere with the immune system or inflammatory markers.

Patient population with inflammatory pathology will include subjects with an inflammatory pathology likely, according to the literature, to be associated with acquired hemophilia A and, in particular patients with rheumatoid arthritis, if possible at diagnosis and not taking any treatment likely to interfere with the disease. immune system or inflammatory markers.

Beskrivelse

Inclusion Criteria:

  1. Patient population with acquired hemophilia A:

    Adult patients with a diagnosis of acquired hemophilia A and with a social security system. Obtaining oral non-opposition from the patient to participate in the study following the submission of an information note relating to the project.

    Obtaining signed and written informed consent for biocollection consent.

  2. Population of Patients with constitutional hemophilia A:

    Adult patients over 50 years of age with severe or moderate constitutional hemophilia A, with no history of autoimmune disease, and with a social security system.

    Obtaining oral non-opposition from the patient to participate in the study following the submission of an information note relating to the project.

    Obtaining signed and written informed consent for biocollection consent.

  3. Population of control subjects:

    Adult patients, over the age of 60, without a coagulation abnormality, with no history of autoimmune disease, and with a social security system.

    Obtaining oral non-opposition from the patient to participate in the study following the submission of an information note relating to the project.

    Obtaining signed and written informed consent for biocollection consent.

  4. Patient population with inflammatory pathology:

Adult patients over the age of 50 with an inflammatory pathology likely to be associated with acquired hemophilia A, and with a social security system.

Obtaining oral non-opposition from the patient to participate in the study following the submission of an information note relating to the project.

Obtaining signed and written informed consent for biocollection consent.

Exclusion Criteria:

For the 4 groups:

  • Minor patient, under guardianship or curatorship.
  • Pregnant and lactating women.
  • Blood transfusion less than 7 days old.
  • Treatment with corticosteroids in the 7 days preceding inclusion or any other immunomodulatory or immunosuppressive treatment in the 4 weeks preceding inclusion.

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Observationsmodeller: CASE_CONTROL
  • Tidsperspektiver: PROSPECTIVE

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Patienter i Acquired Hemophilia A-gruppen.

no intervention

patienter i den konstitutionelle hæmofili A-gruppe.

no intervention

patienter i kontrolpersongruppen.

no intervention

patienter i gruppen af ​​patienter med inflammatorisk patologi.

no intervention

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Evaluate the evolution of lymphocyte populations and subpopulations, MDSCs and inflammatory cytokines in patients with hemophilia A acquired at diagnosis and during follow-up
Tidsramme: 2 years

Comparisons between diagnosis and during follow-up

2 years

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
To test the link between the severity of the disease at diagnosis and the cellular and cytokine parameters.
Tidsramme: 2 years

Factor VIII level and inhibitor titration at diagnosis

2 years
Comparisons of baseline lymphocyte and cytokine data between patients with a favorable versus unfavorable final diagnosis.
Tidsramme: 2 years

Cell populations and cytokine profile and half-life of the inhibitor under treatment, time before normalization of the Factor VIII / Willebrand factor ratio, total duration of treatment with corticosteroids, recurrence and mortality tested to define a favorable course of the disease or unfavorable.

2 years
Comparison of lymphocyte populations and subpopulations, MDSCs and inflammatory cytokines between different groups.
Tidsramme: 2 years

Cell populations and cytokine profile of the different groups at diagnosis and at the end of follow-up.

2 years

Samarbejdspartnere og efterforskere

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

Sponsor

Efterforskere

  • Ledende efterforsker: Marc Fouassier, Nantes University Hospital

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 (Faktiske)

30. november 2021

Primær færdiggørelse (Faktiske)

25. marts 2024

Studieafslutning (Faktiske)

2. juni 2025

Datoer for studieregistrering

Først indsendt

16. marts 2021

Først indsendt, der opfyldte QC-kriterier

16. marts 2021

Først opslået (Faktiske)

18. marts 2021

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

24. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

23. september 2026

Sidst verificeret

1. september 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • RC20_0253

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

UBESLUTET

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 .