CD45RA-depleted CD19-CAR T Cell Consolidation After TCRαβ+/CD19 B Cell-depleted Haploidentical Hematopoietic Cell Transplantation for Relapsed/Refractory CD19+ ALL and Lymphoma

May 18, 2026 updated by: St. Jude Children's Research Hospital

The purpose of this study is to learn more about newer methods of transplanting blood cells donated by a partially matched family member to children with high-risk CD19 positive leukemia ALL.

Primary Objective:

- To assess the safety and feasibility of combining CD19-CAR(Mem) T cells after TCRαβ+/CD19 depleted haploidentical donor transplantation for pediatric patients with relapsed/refractory CD19+ B-cell malignancies.

Secondary Objectives:

  • To estimate 1-year post-transplant overall survival, event-free survival, and GVHD-free relapse-free survival (GRFS).
  • To estimate cumulative incidence of engraftment, acute and chronic GVHD, and immune-related adverse events, including CRS and ICANS.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This is a Phase I study evaluating the addback of CD19-CAR(Mem) T cells after TCRαβ+/CD19 B cell depleted haploidentical donor transplantation for pediatric patients with relapsed/refractory CD19+ B-cell malignancies.

Donors that meet eligibility criteria will be consented to undergo two separate collections: 1) G-CSF mobilized stem cell graft via apheresis for progenitor cell infusion and 2) Non-mobilized peripheral blood mononuclear cells (PBMC) via apheresis for subsequent CAR T-cell manufacturing and DLI if needed.

Patients that meet eligibility criteria to receive therapy will be consented to proceed on study. Treatment will include a conditioning chemotherapy preparative regimen followed by infusion of TCRαβ/CD19 B cell depleted progenitor cell infusion on day 0. Then as early as day + 14 patients will receive the previously manufactured CD19-CAR(Mem) T cell product. Patients will then be monitored for safety and efficacy of the infused CAR T-cell product, as well as collection of correlative samples.

Study Type

Interventional

Enrollment (Estimated)

70

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • Tennessee
      • Memphis, Tennessee, United States, 38105
        • Recruiting
        • St. Jude Children's Research Hospital
        • Principal Investigator:
          • Swati Naik, MBBS
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

Recipient

  • Age less than or equal to 21 years

  • High risk hematologic malignancy where allogeneic transplantation is the current standard of care. This includes (but is not limited to):

    • High risk CD19+ B cell ALL in CR1 or CR2
    • Any CD19+ B-cell ALL in CR3 or subsequent
  • If prior CNS leukemia, it must be treated and in CNS CR
  • Left ventricular ejection fraction > 40%, or shortening fraction ≥ 25%
  • Creatinine clearance (CrCl) or glomerular filtration rate (GFR) ≥ 50 ml/min/1.73m2
  • Forced vital capacity (FVC) ≥ 50% of predicted value; or pulse oximetry ≥ 92% on room air if patient is unable to perform pulmonary function testing
  • Karnofsky or Lansky (age dependent) performance score ≥ 50 (See APPENDIX A)
  • Bilirubin ≤ 3 times the upper limit of normal for age
  • Alanine aminotransferase (ALT) or Aspartate aminotransferase (AST) ≤ 5 times the upper limit of normal for age

Donor

  • At least single haplotype matched (≥ 4 of 8) family member
  • At least 18 years of age
  • HIV negative
  • If sexually active, agreement to use birth control until 2 weeks after completion of the mobilization and apheresis procedure

  • Regarding donation eligibility, is identified as either:

    • Completed the process of donor eligibility determination as outlined in 21 CFR 1271 and agency guidance; OR
    • Does not meet 21 CFR 1271 eligibility requirements, but has a declaration of urgent medical need completed by the principal investigator or physician sub-investigator per 21 CFR 1271

Exclusion Criteria:

Recipient

  • Has a suitable HLA-identical sibling or suitable 12/12 (HLA-A, B, C, DRB1, DQB1, and DPB1) HLA-matched unrelated donor available in an appropriate time frame
  • Any other active malignancy other than the one for which this HCT is indicated
  • Received a prior allogeneic HCT at any time
  • Pregnant, if female is of childbearing potential, negative test must be confirmed by serum or urine pregnancy test within 14 days prior to enrollment
  • If sexually active, agreement to use birth control until 6 months after T cell infusion
  • Breast feeding
  • Any severe current uncontrolled bacterial, fungal or viral infection

Donor

  • Pregnant, negative test must be confirmed by serum or urine pregnancy test within 14 days prior to enrollment if female
  • If female, breast feeding

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: HAPALL Treatment

Patients receive a conditioning regimen that will comprise of ATG, Fludarabine, Cyclophosphamide. Melphalan and Thiotepa. Following the conditioning regimen, patients receive infusion of TCRαβ+/CD19 B cell depleted progenitor cell infusion on day 0. Then as early as day + 14 patients will receive the previously manufactured CD19-CAR(Mem) T cell product. Patients will then be monitored for safety and efficacy of the infused CAR T-cell product,

Cells for infusion are prepared using the CliniMACS system.
Drug: Anti-Thymocyte Globulin (Rabbit)
Days -10, -11, -12.
Drug: Cyclophosphamide
60 mg/kg intravenous once daily on day -9.
Drug: Fludarabine
30 mg/m2 intravenous once daily for >10 kg, 1 mg/kg intravenous once daily for ≤10 kg on days -4, -5, -6, -7, -8.
Drug: Thiotepa
5 mg/kg intravenous twice daily on day -3.
Drug: Mesna
Mesna is planned to be administered at 15 mg/kg/dose prior to cyclophosphamide and at approximately 3, 6, and 9 hours after the cyclophosphamide infusion, to give a 1:1 ratio of mesna:cyclophosphamide.
Drug: Melphalan
70 mg/m2 intravenous once daily for >10 kg, 2.3 mg/kg intravenous once daily for ≤10 kg on days -1, and -2.
Drug: Filgrastim
G-CSF* 10 mcg/kg/day SC days 0, -1, -2, -3, -4, -5.
Other Names:
  • G-CSF
Device: CliniMACS System
The mechanism of action of the CliniMACS Cell Selection System is based on magnetic-activated cell sorting (MACS). The CliniMACS device is a powerful tool for the isolation of many cell types from heterogeneous cell mixtures, (e.g. apheresis products). These can then be separated in a magnetic field using an immunomagnetic label specific for the cell type of interest.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
To assess the safety of combining CD19-CAR(Mem) T cells after TCRαβ+/CD19 depleted haploidentical donor transplantation for pediatric patients with relapsed/refractory CD19+ B-cell malignancies.
Time Frame: This will be assessed 100 days post-HCT
The primary analysis will compute the sample proportions and corresponding binomial exact 95% confidence intervals among evaluable patients for the following toxicities (separately for each toxicity) within 100 days post-HCT: 1) Severe aGVHD defined as Grade 3-4 aGVHD 2) Severe CRS defined as Grade 4 CRS that does not resolve to grade 3 or lower within 72 hours of onset 3) Severe ICANS defined as Grade 4 ICANS that does not resolve to grade 3 or lower within 72 hours of onset 4) TRM defined as death without prior relapse or disease progression within 100 days post-HCT 5) Other toxicity data will also be reported for a complete safety assessment of the study regimen.
This will be assessed 100 days post-HCT
To assess the feasibility of combining CD19-CAR(Mem) T cells after TCRαβ+/CD19 depleted haploidentical donor transplantation for pediatric patients with relapsed/refractory CD19+ B-cell malignancies.
Time Frame: This will be assessed in the first 60 days post-HCT
this will be measured by the failure to receive CD19-CAR(Mem) T cells among patients who received HCT. The number of patients who fail to receive addback will be reported as the proportion who were unable to receive addback within 60 days post-HCT
This will be assessed in the first 60 days post-HCT

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Estimate 1-year post-transplant relapse free survival
Time Frame: This will be assessed in the first 3 years post-HCT
This this will be estimated by the Kaplan-Meier method
This will be assessed in the first 3 years post-HCT
Estimate cumulative incidence of neutrophil engraftment
Time Frame: This will be assessed in the first 30 days post-HCT
This will be summarized by cumulative incidence functions estimated by the Kalbfleisch-Prentice method.
This will be assessed in the first 30 days post-HCT
Estimate cumulative incidence of platelet engraftment
Time Frame: This will be assessed in the first 100 days post-HCT
This will be summarized by cumulative incidence functions estimated by the Kalbfleisch-Prentice method.
This will be assessed in the first 100 days post-HCT
Estimate cumulative incidence of acute and chronic GVHD
Time Frame: This will be assessed in the first 3 years post-HCT
This will be summarized by cumulative incidence functions estimated by the Kalbfleisch-Prentice method.
This will be assessed in the first 3 years post-HCT
Estimate cumulative incidence of immune-related adverse events
Time Frame: This will be assessed in the first 1 years post-HCT
This will be summarized by cumulative incidence functions estimated by the Kalbfleisch-Prentice method.
This will be assessed in the first 1 years post-HCT
To assess the feasibility of combining CD19-CAR(Mem) T cells after TCRαβ+/CD19 depleted haploidentical donor transplantation for pediatric patients with relapsed/refractory CD19+ B-cell malignancies.
Time Frame: This will be assessed in the first 60 days post-HCT
This will be measured by the failure to receive CD19-CAR(Mem) T cells among patients who received HCT. The number of patients who fail to receive addback will be reported as the proportion who were unable to receive addback within 60 days post-HCT
This will be assessed in the first 60 days post-HCT

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

St. Jude Children's Research Hospital

Investigators

  • Principal Investigator: Swati Naik, MBBS, St. Jude Children's Research Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 3, 2026

Primary Completion (Estimated)

December 1, 2031

Study Completion (Estimated)

December 1, 2035

Study Registration Dates

First Submitted

November 20, 2025

First Submitted That Met QC Criteria

November 20, 2025

First Posted (Actual)

December 2, 2025

Study Record Updates

Last Update Posted (Actual)

May 19, 2026

Last Update Submitted That Met QC Criteria

May 18, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • HAPALL
  • NCI-2025-08364 (Other Identifier: NCI Clinical Trial Registration Program)

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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