Phase 1-2 MAHCT w/ TCell Depleted Graft w/ Simultaneous Infusion Conventional and Regulatory T Cell

Phase 1-2 Trial for Patients With Advanced Hematologic Malignancies Undergoing Myeloablative Allogeneic HCT With a T-cell Depleted Graft With Infusion of Conventional T-cells and Regulatory T-cells

This study looks at giving specific types of immune cells, called regulatory T cells and conventional T cells, to patients with blood cancers who are receiving a stem cell transplant. These cells are added back to help the immune system recover and reduce complications after the transplant.

Study Overview

• Status: Completed
• Conditions: Lymphoma, Non-Hodgkin; Acute Myeloid Leukemia; Acute Leukemia; Acute Myelogenous Leukemia; Chronic Myelogenous Leukemia; Myelodysplastic Syndromes (MDS); Acute Lymphoblastic Leukemia (ALL); Myeloid Leukemia, Chronic; Myeloproliferative Syndrome
• Intervention / Treatment: Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Biological: Regulatory T-Cells (Treg); Biological: Conventional T-Cells (Tcon); Procedure: Myeloablative Conditioning Regimen

Detailed Description

Primary Objectives:

• To determine the efficacy, safety and feasibility of administration of several dose combinations of conventional T cells (Tcon) and regulatory T cells (Treg) in patients undergoing allogeneic hematopoietic cell transplantation (HCT) with HLA matched donors (related or unrelated) using a T cell depleted graft [CD34+ hematopoietic progenitor cells ("CD34+ HSPC")], without immune suppression.
• To determine if concomitant single-agent immunosuppression is needed with fresh Treg cells (phase 2 stage 1) * To determine 1-year GvHD-free relapse-free survival (GRFS) post-HCT (phase 2 stage 2).

Secondary Objectives:

• To determine the 1 year OS in patients undergoing allogeneic HCT with matched donors.
• To measure the incidence and severity of acute and chronic graft vs host disease (GvHD)
• To measure incidence of serious infections

• Study Type: Interventional
• Enrollment (Actual): 68
• Phase: Phase 2; Phase 1

Contacts and Locations

Study Locations

• United States
  • California
    • Palo Alto, California, United States, 94305
      • Stanford University School of Medicine Palo Alto, California, United States

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 9 years to 56 years (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Recipient Inclusion Criteria

1. Patients with the following diseases that are histopathologically confirmed are eligible

   • Acute leukemia, primary refractory or beyond CR1, or minimal residual disease (MRD) positivity.
   • High risk acute myeloid leukemia in CR1 with any of the following features:
   • Complex karyotype(≥3 clonal chromosomal abnormalities)

   • Any of the following high risk chromosomal abnormalities:

     • Monosomal karyotype (-5, 5q-, -7, 7q-)
     • t(11q23), t(9;11), inv(3), t(3;3) t(6;9) t(9;22)
     • Normal karyotype with fms-like tyrosine kinase 3 (FLT3)-ITD mutation
   • Other high risk features as determined by molecular studies, or clinical presentation as assessed by the treating physician
   • Chronic myelogenous leukemia (accelerated, blast or second chronic phase)
   • Myelodysplastic syndromes
   • Myeloproliferative syndromes
   • Non-Hodgkin lymphoma with poor risk features not suitable for autologous HCT
2. Age ≥18 yo and ≤ 60 yo for patients in Cohort 1 only. At the start of Cohort 2A and beyond, eligibility will be expanded to allow pediatric patients age ≥ 13 yo.
3. Cardiac ejection fraction ≥ 45%
4. Lung diffusion capacity ≥ 50%
5. Calculated creatinine clearance ≥ 50 cc/min
6. Serum glutamic-pyruvic transaminase( SGPT) and serum glutamic-oxaloacetic transaminase (SGOT) ≤ 3.0 x ULN (Upper limit of normal), unless elevated secondary to disease.
7. Total bilirubin ≤ 2 x ULN (patients with Gilbert's syndrome may be included at the discretion of the PI or where hemolysis has been excluded
8. Availability of a HLA matched donor (related or unrelated) defined by Class I (HLA-A and B) serologic typing (or higher resolution) and Class II (HLA DRB1) molecular typing. An HLA matched donor is defined for this study to be a sibling that is HLA matched 6/6; or an unrelated donor that is HLA matched 6/6 or 5/6. A sibling may be a "half sibling."
9. Karnofsky performance status ≥70%

Recipient Exclusion Criteria

1. Seropositive for any of the following:

   HIV ab; hepatitis B sAg; hepatitis C ab

2. Prior myeloablative therapy or hematopoietic cell transplant
3. Candidate for autologous transplant
4. HIV positive
5. Active uncontrolled bacterial, viral or fungal infection, defined as currently taking antimicrobial therapy and progression of clinical symptoms.
6. Uncontrolled central nervous system (CNS) disease involvement
7. Pregnant or a lactating female
8. Positive serum or urine beta human chorionic gonadotropin (HCG) test in females of childbearing potential within 3 weeks of registration
9. Psychosocial circumstances that preclude the patient being able to go through transplant or participate responsibly in follow up care

Donor Inclusion Criteria

1. Age ≥13 yo and ≤ 75 years
2. Karnofsky performance status of ≥ 70% defined by institutional standards

3. Seronegative for HIV 1 RNA (polymerase chair reaction (PCR); HIV 1 and HIV 2 ab (antibody); HTLV 1 and HTLV 2 ab; PCR+ or sAg (surface antigen) hepatitis B ; or PCR+ or sAg for hepatitis C; negative for the Treponema pallidum antibody Syphilis screen; and negative for HIV 1 and hepatitis C by nucleic acid testing (NAT) within 30 days of apheresis collection. In the case that T pallidum antibody tests are positive, donors must:

   • Be evaluated and show no evidence of syphilis infection of any stage by physical exam and history
   • Have completed effective antibiotic therapy to treat syphilis
   • Have a documented negative non treponemal test (such as RPR) or in the case of a positive non treponemal test must be evaluated by an infectious disease expert to evaluate for alternative causes of test positivity and confirm no evidence of active syphilitic disease
4. Must be 6/6 matched sibling donor as determined by HLA typing
5. Female donors of child-bearing potential must have a negative serum or urine beta-HCG test within three weeks of mobilization
6. Capable of undergoing leukapheresis, have adequate venous access, and be willing to undergo insertion of a central catheter should leukapheresis via peripheral vein be inadequate
7. Agreeable to 2nd donation of Peripheral blood stem cell (PBPC) (or bone marrow harvest) in the event of graft failure
8. The donor or legal guardian greater than 18 years of age, capable of signing an institutional review board (IRB-approved consent form.

Donor Exclusion Criteria

1. Evidence of active infection or viral hepatitis
2. HIV positive
3. Medical, physical, or psychological reason that would place the donor at increased risk for complications from growth factor or leukapheresis
4. Lactating female

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

9

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Cohort 1, Phase I: Low Dose Treg + Tcon (Dose escalation); Participants receive low-dose Treg (1e6 cells/kg) and Tcon (3e6 cells/kg) with CD34+ HSPC.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.
Experimental: Cohort 1A, Phase I: Low Dose Treg + Tcon (Dose escalation); Participants receive low-dose Treg (1e6 cells/kg) and Tcon (1e6 cells/kg) with CD34+ HSPC.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.
Experimental: Cohort 2, Phase 1: Mid Dose Treg + Tcon (Dose escalation); Participants receive low-dose Treg (3e6 cells/kg), Tcon (1e6 cells/kg), and CD34+ HSPC following a conditioning regimen.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.; Procedure: Myeloablative Conditioning Regimen; Chemotherapy or total body irradiation used before hematopoietic cell transplantation.
Active Comparator: Cohort 2A, Phase I: Mid Dose Treg + Tcon (Dose escalation); Participants receive low-dose Treg (up to 3e6 cells/kg), Tcon (3e6 cells/kg), and CD34+ HSPC following a conditioning regimen.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.; Procedure: Myeloablative Conditioning Regimen; Chemotherapy or total body irradiation used before hematopoietic cell transplantation.
Experimental: Cohort 3, Phase I: High Dose Treg + Tcon (Dose escalation); Participants receive high-dose Treg (3e6 cells/kg), Tcon (3e6 cells/kg), and CD34+ HSPC following a conditioning regimen.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.; Procedure: Myeloablative Conditioning Regimen; Chemotherapy or total body irradiation used before hematopoietic cell transplantation.
Experimental: Cohort 3A, Phase I: High Dose Treg + Tcon (Dose escalation); Participants receive high-dose Treg (1e6 cells/kg), Tcon (1e6 cells/kg), and CD34+ HSPC following a conditioning regimen.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.; Procedure: Myeloablative Conditioning Regimen; Chemotherapy or total body irradiation used before hematopoietic cell transplantation.
Active Comparator: Phase 2: Myeloablative HCT Control; Participants receive standard myeloablative conditioning with CD34+ HSPC and no experimental Treg or Tcon.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Procedure: Myeloablative Conditioning Regimen; Chemotherapy or total body irradiation used before hematopoietic cell transplantation.
Experimental: Phase 2 Treg + Tcon with Immunosuppression; Participants receive Treg and Tcon therapy with immunosuppressive drugs following myeloablative conditioning.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.; Procedure: Myeloablative Conditioning Regimen; Chemotherapy or total body irradiation used before hematopoietic cell transplantation.
Experimental: Phase 2 Treg + Tcon without Immunosuppression; Participants receive Treg and Tcon therapy without immunosuppressive drugs following myeloablative conditioning.	Biological: CD34+ Hematopoietic Progenitor Cells (HSPC); Purified CD34+ hematopoietic progenitor cells used in transplantation.; Biological: Regulatory T-Cells (Treg); Highly purified CD4+CD25+CD127-FoxP3+ regulatory T cells to reduce graft-versus-host disease.; Biological: Conventional T-Cells (Tcon); Conventional CD3+ T cells used for immune reconstitution and graft enhancement.; Procedure: Myeloablative Conditioning Regimen; Chemotherapy or total body irradiation used before hematopoietic cell transplantation.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
GvHD Free Relapse Free Survival (GRFS)	GvHD-free is defined as no GvHD symptoms, and relapse free survival is defined as survival at 12 months without relapse.	12 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants With Dose-Limiting Toxicity (DLT) Within 28 Days	Dose-limiting Toxicity (DLT) was assessed as: Absolute neutrophil count <500/µL, to 28 day; Cytokine release syndrome/acute infusion reactions as CTCAE Grade 3 to 5; Grade 3 to 4 acute GvHD. GvHD was staged as follows:1: Skin: rash <25%. Liver: bilirubin (BIL) 2-3mg/dL. Gut: diarrhea (DIA) 500-1000 mL/day2: Skin: rash 25-50%. Liver: BIL 3-6mg/dL. Gut: DIA 1001-1500 mL/day3: Skin: rash > 50%. Liver: BIL 6-15mg/dL. Gut: DIA >1501-2000 mL/day4: Skin: generalized erythroderma. Liver: BIL >15mg/dL. Gut: DIA >2001 mL/day GvHD was graded as follows.1: Skin Stage 1-2; No Liver stage; No Gut stage2: Skin Stage 1-3 ; Liver Stage 1; +/- Gut Stage 13: Skin Stage 2-3, Liver Stage 2-4; +/- Gut Stage 2-34: Skin Stage 2-4; Liver Stage 2-4; +/- Gut Stage 2-4 The outcome is reported as the number of participants who received both Treg and Tcon cell infusions and had DLT events, per treatment level.	28 days
Number of Participants With Overall Survival (OS) at 1 Year	Overall Survival (OS) at 1 year was assessed as the number of participants per treatment level that received the hematopoietic cell transplant (HCT), and remained alive 12 months later.	1 year
Number of Participants With Severity of Chronic Graft-vs-Host Disease (cGvHD) at 24 Months	Incidence and severity of chronic GvHD was assessed in participants who received the hematopoietic cell transplant (HCT) at 24 months.	2 years
Number of Participants With Incidence of Serious Infections	The outcome is reported as the number of serious infections per treatment level, in participants who received the hematopoietic cell transplant (HCT).	24 months
Number of Participants Receiving Concomitant Single-Agent Immunosuppression	During Phase 2, stage 1, concomitant single-agent immunosuppression was assessed as in participants receiving fresh Treg cells.	2 years

Collaborators and Investigators

• Sponsor: Stanford University
• Collaborators: National Heart, Lung, and Blood Institute (NHLBI); National Institutes of Health (NIH)
• Investigators: Principal Investigator: Everett Meyer, Stanford University

Publications and helpful links

General Publications

• Meyer EH, Laport G, Xie BJ, MacDonald K, Heydari K, Sahaf B, Tang SW, Baker J, Armstrong R, Tate K, Tadisco C, Arai S, Johnston L, Lowsky R, Muffly L, Rezvani AR, Shizuru J, Weng WK, Sheehan K, Miklos D, Negrin RS. Transplantation of donor grafts with defined ratio of conventional and regulatory T cells in HLA-matched recipients. JCI Insight. 2019 May 16;4(10):e127244. doi: 10.1172/jci.insight.127244. eCollection 2019 May 16.

Study record dates

Study Major Dates

• Study Start (Actual): February 9, 2012
• Primary Completion (Actual): December 20, 2023
• Study Completion (Actual): December 20, 2023

Study Registration Dates

• First Submitted: August 6, 2012
• First Submitted That Met QC Criteria: August 6, 2012
• First Posted (Estimated): August 8, 2012

Study Record Updates

• Last Update Posted (Actual): August 19, 2025
• Last Update Submitted That Met QC Criteria: August 18, 2025
• Last Verified: August 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Neoplasms; Chronic Disease; Disease Attributes; Immune System Diseases; Neoplasms by Histologic Type; Disease; Hematologic Diseases; Lymphatic Diseases; Lymphoproliferative Disorders; Immunoproliferative Disorders; Precancerous Conditions; Lymphoma; Bone Marrow Diseases; Leukemia, Lymphoid; Myeloproliferative Disorders; Syndrome; Leukemia; Leukemia, Myeloid; Leukemia, Myeloid, Acute; Precursor Cell Lymphoblastic Leukemia-Lymphoma; Lymphoma, Non-Hodgkin; Preleukemia; Myelodysplastic Syndromes; Leukemia, Myelogenous, Chronic, BCR-ABL Positive
• Other Study ID Numbers: IRB-21257; SU-09142011-8407 (Other Identifier: Stanford University); BMT236 (Other Identifier: OnCore); 1R01HL114591-01 (U.S. NIH Grant/Contract); NCI-2011-03025 (Registry Identifier: National Cancer Institute Clinical Trials Reporting Program)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No