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NCT Number: NCT04835519

Phase I/II Study of Enhanced CD33 CAR T Cells in Subjects With Relapsed or Refractory Acute Myeloid Leukemia

This is a open-label, nonramdominzed, single-arm, Phase I/II Study to evaluate safety and tolerability of functionally enhanced CD33 CAR-T cells in subjects with relapsed or refractory acute myeloid leukemia. 25 subjects will be enrolled. Subjects will be pretreated with chemotherapy prior to infusion of CAR T cells: about 5 days before cells transfusion, the patients who planned to reinfuse CAR T cells were treated with fluorodarabine 30 mg/m^2( body surface area) and cyclophosphamide 250 mg/m^2( body surface area) for 3 days. Then the Bayesian optimal interval phase I/II (Boin12) trial design will be used in this study: The protocol preset 2 dose levels: Dose 1 (DL-1) was 5×10^5 (±20%) CAR T cells/kg, and dose 2 (DL-2) was 1×10^6 (±20%) CAR T cells/kg. Phase I was the dose exploration phase. After determining the optimal biological dose (OBD), phase II will be expanded at the OBD dose by 10 cases, enrollment will reach 25 cases, and the trial will be discontinued. Moreover, the first 3 enrolled subjects per dose group will be on one by one dosing regimen.

The expected initial dose of 5×10^5 (±20%) CAR T cells/kg could not be achieved due to preparation problems and should be placed in the reduced dose group. The number of cells will be collected by the above regimen as far as possible. If this is not possible, subjects can still enter the study upon investigator consideration but require documentation of dosing. The lowest dose is 1×10^5 CAR T cells/kg (±20%), and the highest dose is 1×10^6 CAR T cells/kg (±20%). If the dose is out of the range mentioned above, entry into the trial will not be considered.

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Key information

Conditions

Acute Myeloid Leukemia Hematologic Diseases Hemic and Lymphatic Diseases Leukemia Leukemia, Myeloid Leukemia, Myeloid, Acute Neoplasms Neoplasms by Histologic Type Refractory Acute Myeloid Leukemia Relapse Leukemia

Age range

1 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1 / Phase 2

Primary location

Beijing Boren Hospital

Beijing, Beijing Municipality, 100000, China

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

In order to be eligible to participate in this study, an individual must meet all of the following criteria:

  • Candidates with relapse or refractory CD33+ acute myeloid leukemia, who have progressed on after treatment with all standard therapies or intolerant of standard care, have limited prognosis with currently available therapies and had no available curative treatment options (such as HSCT or chemotherapy)
  • Male or female, aged 1-70 years
  • No serious allergic constitution
  • Eastern Cooperative Oncology Group (ECOG) performance status (Oken et al.,1982) score 0 to 2
  • Have life expectancy of at least 60 days based on investigator's judgement
  • CD33 positive in bone marrow or cerebrospinal fluid (CSF) by flow cytometry, or CD33 positive in tumor tissues by immunohistochemistry; (CD33 positive criteria: Flow cytometry: Positive: > 80% of tumor cells expressed CD33 and the MFI of CD33 is the same as that in normal myeloid cells; Dim: > 80% of tumor cells expressed CD33, but the MFI of CD33 is lower than that in normal myeloid cells as least as 1log; Partial positive: 20-80% of tumor cells expressed CD33 and the MFI of CD33 is the same as that in normal myeloid cells. Tumor tissue immunohistochemistry: Positive > 30% tumor cells expressed CD33);
  • Provide a signed informed consent before any screening procedure; subjects who voluntarily participate in the study should have the ability to understand and sign the informed consent form and be willing to follow the study visit schedule and relevant study procedure, as specified in the protocol. Candidates aged 19-70 years need to be sufficiently conscious and able to sign the treatment consent form and voluntary consent form. Pediatric patients aged 1-7 years could be recruited after signing an informed consent form by a legal surrogate (Guardian); pediatric patients aged 8-18 years need to be sufficiently conscious and voluntarily signed an informed consent form, and their legal surrogates (guardians) were also required to sign a written informed consent form.

Exclusion criteria

An individual who meets any of the following criteria will be excluded from participation in this study:

  • Intracranial hypertension or disorder of consciousness
  • Symptomatic heart failure or severe arrhythmia
  • Symptoms of severe respiratory failure
  • Complicated with other types of malignant tumors
  • Diffuse intravascular coagulation
  • Serum creatinine and / or blood urea nitrogen ≥ 1.5 times of the normal value
  • Suffering from septicemia or other uncontrollable infections
  • Patients with uncontrollable diabetes
  • Severe mental disorders
  • Obvious and active intracranial lesions were detected by cranial magnetic resonance imaging (MRI)
  • Have received organ transplantation (excluding hematopoietic stem cell transplantation);
  • Reproductive-aged female patients with positive blood HCG test
  • Screened to be positive of infection of hepatitis (including hepatitis B and C), AIDS or syphilis
  • Patients with tumor burden higher than 30% requiring reinfusion of autologous CAR-T cells.

Treatment and study plan

chimeric antigen receptor T cell

Biological

Subjects will be pretreated with chemotherapy prior to infusion of CAR T cells: about 5 days before cells transfusion, the patients who planned to reinfuse CAR T cells were treated with fluorodarabine 30 mg/m^2( body surface area) and cyclophosphamide 250 mg/m^2( body surface area) for 3 days. Then this study will be using the Bayesian optimal interval phase I/II (Boin12) trial design. The protocol preset 2 dose levels: Dose 1 (DL-1) was 5×10^5 (±20%) CAR T cells/kg, and dose 2 (DL-2) was 1×10^6 (±20%) CAR T cells/kg. If the above dose cannot be met, subjects can still enter the study upon investigator consideration but require documentation of dosing. The lowest dose is 1×10^5 CAR T cells/kg (±20%), and the highest dose is 1×10^6 CAR T cells/kg (±20%). If the dose is out of the range mentioned above, entry into the trial will not be considered.

Primary outcomes

  1. Incidence and type of dose-limiting toxicity (DLT)

    Time frame: day 21 post intravenous CAR T cell infusion

  2. Incidence and severity of adverse events (AE)

    Time frame: day 28 post intravenous CAR T cell infusion

Secondary outcomes

  1. CR (complete remission) rate and CRi (complete remission with incomplete blood count recovery) rate to the CAR-T treatment

    Time frame: day 15 post intravenous CAR T cell infusion

  2. CR rate and CRi rate to the CAR-T treatment

    Time frame: day 28 post intravenous CAR T cell infusion

Sponsors and collaborators

Lead sponsor

Beijing Boren Hospital

Other

Registry information

Official study title

Open-Label, Nonramdominzed, Single-Arm Phase I/II Study to Evaluate the Safety and Tolerability of Functionally Enhanced CD33 CAR T Cells in Subjects With Relapsed or Refractory Acute Myeloid Leukemia

Important dates

Study start
2021
Primary completion
2023
Study completion
2023
First posted
Apr 8, 2021
Registry last updated
Jun 21, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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