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Reduceret Intensity Conditioning (RIC) regime til patienter med ikke-maligne lidelser (RIC)

27. august 2026 opdateret af: Children's Hospital of Philadelphia

This Phase II pilot study evaluates the safety and effectiveness of reduced-intensity conditioning (RIC) regimens prior to allogeneic hematopoietic stem cell transplantation (HSCT) in pediatric and young adult patients with non-malignant disorders, including immunodeficiencies and hemoglobinopathies. The study examines different conditioning approaches that vary in the timing and dosing of alemtuzumab (Campath), as well as disease-specific modifications for beta thalassemia major and infants. The primary objective is to assess donor engraftment and event-free survival at one year following transplant. The study aims to determine whether RIC regimens can reduce toxicity while maintaining successful engraftment and disease control.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

This Phase II, single-institution, investigator-initiated pilot study evaluates reduced-intensity conditioning (RIC) strategies in the setting of allogeneic hematopoietic stem cell transplantation (HSCT) for non-malignant disorders. The study focuses on optimizing conditioning approaches to balance adequate immunosuppression for donor engraftment with minimization of regimen-related toxicity.

RIC regimens are designed to reduce the organ toxicity and late effects associated with traditional myeloablative conditioning while maintaining sufficient host immune suppression to allow durable donor cell engraftment. This approach is particularly relevant in patients with pre-existing organ dysfunction or increased vulnerability to treatment-related complications. In non-malignant diseases, full donor chimerism may not be required for therapeutic benefit, and stable mixed chimerism may be sufficient for disease correction.

The conditioning strategies evaluated in this protocol primarily differ in the timing and administration of alemtuzumab, an anti-CD52 monoclonal antibody used to deplete host lymphocytes and reduce the risk of graft rejection and graft-versus-host disease. Earlier ("distal") administration is intended to reduce prolonged exposure at the time of stem cell infusion, thereby preserving donor immune function, while more proximal administration provides more immediate immunosuppression but may increase the risk of delayed immune recovery.

Disease-specific modifications to conditioning intensity are incorporated for select populations. Patients with beta thalassemia major receive additional cytoreductive and immunosuppressive agents to address the higher risk of graft rejection associated with intact immunity and expanded marrow space. Infants with immunodeficiencies are treated with modified regimens designed to reduce toxicity while maintaining engraftment potential.

Following conditioning, patients undergo stem cell transplantation using donor sources that may include related or unrelated donors as well as cord blood or alternative donor options based on clinical circumstances. Standard supportive care and post-transplant immunosuppression are administered according to institutional guidelines.

Patients are monitored longitudinally for engraftment, donor chimerism, immune recovery, and transplant-related complications. The study also evaluates clinical management strategies such as donor lymphocyte infusions or second transplantation in cases of declining chimerism or graft failure.

This study is intended to inform optimal conditioning approaches for patients with non-malignant disorders undergoing HSCT, with the goal of improving transplant tolerability while maintaining effective and durable engraftment.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

56

Fase

  • Fase 2

Kontakter og lokationer

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

Studiesteder

    • Pennsylvania
      • Philadelphia, Pennsylvania, Forenede Stater, 19104
        • The Children's Hospital of Philadelphia

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

6 måneder til 25 år (Barn, Voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  1. Age >6 months- 25 years

  2. Diseases eligible for Distal Alemtuzumab:

    • Immunodysregulation polyendocrinopathy enteropathy X-linked (IPEX) syndrome
    • Sickle cell disease (Neurologic: history of stroke or any neurologic defect lasting >24 hours accompanied by infarct on MRI; or abnormal transcranial Doppler, or abnormal MRI with cerebral vasculature stenosis. OR minimum 2 episodes of acute chest syndrome in preceding 2 year period OR history 3 or more severe pain events/year in the 2 years prior to transplant.)
    • Thalassemia major
    • Bone marrow failure, including Kostmann's, amegakaryocytic thrombocytopenia, Blackfan-Diamond syndrome
  3. Diseases eligible for Intermediate Alemtuzumab

    • Hemophagocytic lymphohistiocytosis other macrophage activation syndromes, severe Langerhans histiocytosis
    • Severe combined immune deficiency, adenosine deaminase deficiency, common variable immunodeficiency
    • Wiskott-Aldrich syndrome
  4. Organ criteria:

    • Cardiac: Echocardiogram shortening fraction >27%
    • Pulmonary: for those with pulmonary function tests: DLCO/VA >40% If DLCO/VA is not reported this is considered inability to perform the test. In this case Pulse Ox and Respiratory Exam will be used as evaluation criteria.
    • Renal: Serum creatinine <1.5 x upper limit of normal for age
    • Hepatic:; ALT and AST <5 x upper limit of normal
    • Infection: No active infections.

Exclusion criteria

  1. Uncontrolled bacterial, fungal or viral infections.
  2. Bare lymphocyte syndrome (MHC class II deficiency)

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: N/A
  • Interventionel model: Enkelt gruppeopgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Reduced-Intensity Conditioning (RIC) HSCT

Participants receive reduced-intensity conditioning with alemtuzumab-, fludarabine-, and melphalan-based regimens, varying by timing of alemtuzumab (distal or intermediate). Regimens are based on established protocols used in non-malignant disorders. Alemtuzumab is administered prior to other agents to reduce risk of declining donor chimerism. Participants then undergo allogeneic stem cell transplantation with standard post-transplant care.

A pre-transplant conditioning approach designed to provide sufficient immunosuppression to enable donor cell engraftment while minimizing regimen-related toxicity compared to myeloablative conditioning. Regimens are adapted based on patient age and underlying disease characteristics using the following agents: Campath, Fludarabine, Melphalan, Cyclosporine, Cellcept (MMF).

Andre navne:
  • RIC

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Number of Participants With Engraftment
Tidsramme: Post Transplant -100 days

engraftment of patients with non-malignant disorders will be evaluated using a reduced-intensity conditioning regimen

Post Transplant -100 days

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Event-free Survival
Tidsramme: 1 year post transplant

Event-free survival is defined as the time interval to either primary or late graft failure, disease recurrence, or death.

1 year post transplant

Samarbejdspartnere og efterforskere

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

Sponsor

Efterforskere

  • Ledende efterforsker: Timothy J Olson, MD, Children's Hospital of Philadelphia

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

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)

1. januar 2008

Primær færdiggørelse (Faktiske)

1. juli 2024

Studieafslutning (Faktiske)

1. juni 2025

Datoer for studieregistrering

Først indsendt

15. januar 2010

Først indsendt, der opfyldte QC-kriterier

15. januar 2010

Først opslået (Anslået)

18. januar 2010

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

23. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

27. august 2026

Sidst verificeret

1. august 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 08-005658
  • CHP 894 (Anden identifikator: Children's Hospital of Philadelphia)

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

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