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Administration af donor-T-celler med Caspase-9-selvmordsgenet (DOTTI)

30. september 2026 opdateret af: Helen Heslop, Baylor College of Medicine

Administration af haploidentiske donor-T-celler transduceret med det inducerbare Caspase-9-selvmordsgen

Patients will be receiving a stem cell transplant as treatment for their disease. As part of the stem cell transplant, patients will be given very strong doses of chemotherapy, which will kill all their existing stem cells.

A close relative of the patient will be identified, whose stem cells are not a perfect match for the patient's, but can be used. This type of transplant is called "allogeneic", meaning that the cells are from a donor. With this type of donor who is not a perfect match, there is typically an increased risk of developing GvHD, and a longer delay in the recovery of the immune system.

GvHD is a serious and sometimes fatal side-effect of stem cell transplant. GvHD occurs when the new donor cells (graft) recognize that the body tissues of the patient (host) are different from those of the donor.

In this study, investigators are trying to see whether they can make special T cells in the laboratory that can be given to the patient to help their immune system recover faster. As a safety measure, we want to "program" the T cells so that if, after they have been given to the patient, they start to cause GvHD, we can destroy them ("suicide gene").

Investigators will obtain T cells from a donor, culture them in the laboratory, and then introduce the "suicide gene" which makes the cells sensitive to a specific drug called AP1903. If the specially modified T cells begin to cause GvHD, the investigators can kill the cells by administering AP1903 to the patient. We have had encouraging results in a previous study regarding the effective elimination of T cells causing GvHD, while sparing a sufficient number of T cells to fight infection and potentially cancer.

More specifically, T cells made to carry a gene called iCasp9 can be killed when they encounter the drug AP1903. To get the iCasp9 gene into T cells, we insert it using a virus called a retrovirus that has been made for this study. The AP1903 that will be used to "activate" the iCasp9 is an experimental drug that has been tested in a study in normal donors with no bad side-effects. We hope we can use this drug to kill the T cells.

The major purpose of this study is to find a safe and effective dose of "iCasp9" T cells that can be given to patients who receive an allogeneic stem cell transplant. Another important purpose of this study is to find out whether these special T cells can help the patient's immune system recover faster after the transplant than they would have otherwise.

Studieoversigt

Status

Aktiv, ikke rekrutterende

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

If the patient is doing well after the stem cell transplant, and does not have severe GvHD, s/he will be eligible to receive the special "iCasp9" T cells from Day 30 to 90 after transplant. The specially selected and treated T cells will be given by vein (IV) once.

This is a dose escalation study. This means that at the beginning, patients will be started on the lowest dose (1 of 5 different levels) of T cells. Once that dose schedule proves safe, the next group of patients will be started at a higher dose. This process will continue until all 5 dose levels are studied. If the side-effects are too severe, the dose will be lowered or the T cell injections will be stopped.

If the patient develops GvHD after being given the specially treated T cells, we will prescribe AP1903, which has been shown to kill cells carrying the iCasp9 gene. This drug will be given as a 2-hour IV infusion.

We will continue to follow the patient weekly in the bone marrow transplant clinic for the first month after the infusion, to check for side-effects of the treatment and for GvHD. The patient will have the standard tests performed that all patients have after transplant, even when not receiving special T cells.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

15

Fase

  • Fase 1

Kontakter og lokationer

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

Studiesteder

    • Texas
      • Houston, Texas, Forenede Stater, 77030
        • The Methodist Hospital
      • Houston, Texas, Forenede Stater, 77030
        • Texas Children's Hospital

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

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

Inclusion Criteria at Time of Procurement:

  1. Lack of a suitable conventional donor (i.e. 5/6 or 6/6 related, or 5/6 or 6/6 unrelated donor), or presence of a rapidly progressive disease not permitting time to identify an unrelated donor.

  2. High risk disease in one of the following:

    • Myelodysplastic syndrome (MDS) in one of the following categories: RCMD with an IPSS-R of intermediate, poor, or very poor, RAEB-1, or RAEB-2
    • Acute myeloid leukemia (AML) after first relapse or primary refractory disease
    • Chronic myelogenous leukemia (CML) in Chronic Phase 2 or greater, Accelerated Phase or Blast Crisis
    • Acute lymphoblastic leukemia (ALL) after first relapse or primary refractory disease, or High-Grade Non Hodgkin lymphoma (NHL) Stage III or IV after first relapse or primary refractory disease
    • Hemophagocytic lymphohistiocytosis (HLH)
    • Familial hemophagocytic lymphohistiocytosis (FLH)
    • Viral-associated hemophagocytic syndrome (VAHS)
    • T or NK cell lymphoproliferative syndrome
    • X-linked lymphoproliferative disease (XLP)

Inclusion Criteria at Time of T Cell Infusion:

  1. Engrafted with an absolute neutrophil count (ANC) > 500 cells/µL
  2. Greater than or equal to 50% donor chimerism in either peripheral blood or bone marrow, or relapse of their original disease
  3. Life expectancy > 30 days
  4. Lansky/Karnofsky score greater than or equal to 60
  5. Absence of severe renal disease (creatinine > 2X upper limit of normal for age)
  6. Absence of severe hepatic disease (direct bilirubin > 3X upper limit of normal or SGOT > 3X upper limit of normal)
  7. Oxygen saturation > 94% on room air
  8. Patient/Guardian able to give informed consent
  9. AP1903 available in sufficient quantities to allow for treatment of the patient

Exclusion Criteria:

Exclusion Criteria at Time of T Cell Infusion:

  1. GvHD

  2. Severe intercurrent infection

  3. Pregnancy*

  4. Other investigational drugs in the prior 30 days

    • Pregnancy test only required for at-risk individuals, defined as female patients of childbearing potential who have received a reduced-intensity conditioning regimen.

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: iCaspase9-transduced T cells

The 5 dose levels are:

  1. 1 x 10^4 T cells/kg
  2. 1 x 10^5 T cells/kg
  3. 5 x 10^5 T cells/kg
  4. 1 x 10^6 T cells/kg
  5. 5 x 10^6 T cells/kg

AP1903 will be administered if there is development of Grade 1 or greater GvHD.

Patients will receive the T cells between 30 and 90 days following transplantation. The T cells will be infused through a catheter line.

AP1903 will be administered if there is development of Grade 1 or greater GvHD.

Dose: 0.4 mg/kg by IV over 2 hours.

Up to 3 additional doses may be administered if the GvHD does not respond or gets worse.

Andre navne:
  • AP1903 Dimerizer Drug

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Clinical and immunological effects of AP1903 administration.
Tidsramme: 14 days

To evaluate the clinical and immunological effects of AP1903 administration, a dimerizer drug used to activate an iCaspase9 suicide gene mechanism, to subjects who have received escalating doses of T lymphocytes expressing the iCaspase9 gene and developed acute graft-versus-host-disease (GvHD).

14 days

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
T cell dose that produces a greater than 25% risk of Grade II or greater GvHD.
Tidsramme: 42 days

To discover the number of T cells/kg (up to 5 x 10^6/kg) that produce a greater than 25% risk of inducing Grade II or greater acute GvHD in these subjects.

42 days
Immune reconstitution and relative contribution of iCaspase9-modified T cells post-infusion.
Tidsramme: Up to 15 years

To measure the subsequent immune reconstitution of recipients of iCaspase9 modified T cells (and dimerizer drug), and assess the relative contribution of endogenous T cell recovery and infused gene-modified T cells.

Up to 15 years
Overall and disease-free survival.
Tidsramme: 100 days and 1 year

To measure the overall and disease-free survival of recipients of iCaspase9 T cells at 100 days and at 1 year post-transplant.

100 days and 1 year

Samarbejdspartnere og efterforskere

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

Sponsor

Samarbejdspartnere

Efterforskere

  • Ledende efterforsker: Helen E Heslop, MD, Baylor College of Medicine

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.

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

1. november 2011

Primær færdiggørelse (Anslået)

1. maj 2029

Studieafslutning (Anslået)

1. maj 2029

Datoer for studieregistrering

Først indsendt

15. december 2011

Først indsendt, der opfyldte QC-kriterier

15. december 2011

Først opslået (Anslået)

16. december 2011

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

2. oktober 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

30. september 2026

Sidst verificeret

1. september 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • H-28256-DOTTI
  • DOTTI (Anden identifikator: Baylor College of Medicine)

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ja

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 .