A Study of Obecabtagene Autoleucel in People With B-cell Acute Lymphoblastic Leukemia

Recruiting now · Phase 2

Conditions studied: Acute Lymphoblastic Leukemia

In brief

The researchers are doing this study to find out whether obecabtagene autoleucel (obe-cel) is an effective treatment for people with B-cell acute lymphoblastic leukemia (ALL) that is in complete remission (CR, meaning all signs of cancer are gone) with no measurable residual disease (MRD-negative, meaning there are no detectable cancer cells). Participants in this study will have received past treatment for their B-cell ALL, and their disease will be in MRD-negative CR for the first time (first MRD-negative CR).

Key facts

Study ID: NCT07400029
Run by: Memorial Sloan Kettering Cancer Center
People needed: 40
Starts: 2026-02-03
Expected to finish: 2029-02-01
Last updated by the study team: 2026-06-29

Who can join

Age: 40 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Diagnosis of CD19+ B-cell ALL.
Both Ph-negative and Ph-positive are allowed
Patients with EMD must have detectable disease in the bone marrow (by flow cytometry or molecular methods) in order to follow MRD.
Patients aged ≥ 40 years at time of screening A.
Patients aged 30-39 years (at time of Screening A) are allowed in the presence of high-risk comorbidities or poor tolerability of chemotherapy (e.g. history or experienced pancreatitis with therapy, BMI ≥40kg/m2, underlying liver disease precluding safer administration of pediatric inspired regimens, any further combination of documented severe comorbidities that the investigator judges to be incompatible with administering an intensive pediatric or pediatric-inspired standard chemotherapy regimen).
In MRD negative CR or CR with incomplete hematologic recovery (CRi) at the time of screening. MRD will be assessed by flow cytometry and/or molecular testing such as ClonoSEQ at the minimum sensitivity of 10-4 from the bone marrow. Patients with MRD <10\^-4 will be eligible.
Patients may receive more than one course of upfront induction and/or consolidation, but must be in MRD- CR/CRi at time of screening, within 4 months from initiation of treatment. The 4-month window will be measured from the first day of anti-leukemic therapy initiation (excluding steroid prophase) until the Screening A test for the trial.
Frontline regimens include but are not limited to:
HyperCVAD or mini-hyper-CVD
Asparaginase-containing multiagent chemotherapy (e.g. CALGB10403, pediatric inspired chemo)
Inotuzumab or blinatumomab with or without chemotherapy
Tyrosine kinase inhibitor plus steroids, chemotherapy, or blinatumomab
Adequate organ function at time of screening A, including:
ALT or AST ≤5x ULN and total bilirubin ≤2 (or ≤3 if history of Gilbert's syndrome or leukemic infiltration of the liver)
Serum creatinine <2.0mg/dL
SaO2 ≥92% on room air
Left ventricular ejection fraction (LVEF) ≥50% within 1 month of screening
ECOG performance status 0-2
CD19 expression is required at any time since diagnosis. CD19 expression may be detected by immunohistochemistry or by flow cytometry. Patients receiving prior blinatumomab are eligible if there is no documentation of CD19-negative disease after blinatumomab.
CNS1 status must be documented at time of screening by CSF assessment. Patients with prior CNS2 or CNS3 disease must be CNS1 at screening and have no residual CNS deficits or symptoms.
Patients will need to adhere to institutional contraception guidelines for a minimum of 1 year.
Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial

You may not qualify if…

Burkitt's leukemia or lymphoma
Patients with measurable extramedullary disease at screening are excluded. Patients with prior history of extramedullary disease are allowed after documentation of disease resolution by either PET/CT scan (or CT with contrast if PET cannot be performed).
The following medications are excluded:
Steroids: Therapeutic doses of corticosteroids (greater than 10mg daily of prednisone or its equivalent) within 7 days of leukapheresis or 72 hours prior to CAR T cell infusion.
Systemic chemotherapy: Must be discontinued 7 days prior to leukapheresis or 7 days prior to starting lymphodepleting chemotherapy if used during bridging.
Tyrosine kinase inhibitors: Must be discontinued 48 hours prior to apheresis and 48 hours prior to starting lymphodepleting chemotherapy, if used during bridging.
Blinatumomab must be discontinued 5 days before apheresis
Inotuzumab must be discontinued 2 weeks before apheresis to allow T cell recovery
Patients with uncontrolled systemic fungal, bacterial, viral or other infection at time of leukapheresis or at time of CAR T cell infusion
Blinatumomab may not be used as bridging therapy following apheresis
Positive test indicating the presence of active infection with the following pathogens: HIV, Hepatitis B (detectable Hep B DNA by PCR or Hep B surface antigen), Hepatitis C (detectable Hep C RNA by PCR), HTLV, Syphilis. The tests required will be agreed upon with the manufacturer to comply with manufacturer's regulatory and manufacturing requirements.

Where it is running

Stanford University (Data Collection AND Specimen Analysis) — Stanford, California, United States (enrolling)
Memorial Sloan Kettering at Basking Ridge (Limited Protocol Activities) — Basking Ridge, New Jersey, United States (enrolling)
Memorial Sloan Kettering Monmouth (Limited Protocol Activities) — Middletown, New Jersey, United States (enrolling)
Memorial Sloan Kettering Bergen (Limited Protocol Activities) — Montvale, New Jersey, United States (enrolling)
Memorial Sloan Kettering Cancer Commack - Suffolk (Limited Protocol Activities) — Commack, New York, United States (enrolling)
Memorial Sloan Kettering Westchester (Limited Protocol Activities) — Harrison, New York, United States (enrolling)
Memorial Sloan Kettering Cancer Center (All Protocol Activities) — New York, New York, United States (enrolling)
Memorial Sloan Kettering Nassau (Limited Protocol Activities) — Uniondale, New York, United States (enrolling)

Full record on ClinicalTrials.gov

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