Reduced intensity conditioning (RIC) has emerged and been increasingly adopted as a modality to allow preparative conditioning pre transplant to be tolerated by older adults or those patients that are otherwise unfit for myeloablative conditioning. In this study, we aim to use RIC followed by matched related/unrelated donor, 7/8 matched related/unrelated donor, or haploidentical donor peripheral blood stem cell transplantation. Standard strategies to control the alloreactivity following HCT utilize immunosuppressive or cytotoxic medications. In this study, we explore donor graft engineering to enrich for immmunoregulatory populations to facilitate post transplantation immune reconstitution while minimizing graft versus host disease (GVHD) with post-transplant immunosuppressive agents.
The objectives for the study are listed below: Primary Objectives \*Determine the safety, and feasibility of administration of several dose combinations of conventional T-cells (Tcon) and regulatory T-cells (Treg) in subjects undergoing allogeneic hematopoietic cell transplantation (HCT) with related/unrelated HLA-matched or mismatched donors, or haploidentical donors with reduced intensity conditioning preparative regimen. Secondary Objectives * To determine the GVHD-free relapse-free survival (GRFS) post-HCT * To determine the overall survival (OS) post-HCT * To measure the incidence and severity of acute and chronic GVHD Exploratory Objectives * To measure the incidence of serious infections * To measure the incidence and timing of engraftment * To measure T cell immunity reconstitution parameters
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
60
Purified regulatory T-cells (Treg) plus CD34+ hematopoietic progenitor cells ("CD34+ HSPC"), followed by conventional T-cells (Tcon) Manufactured at SCTT Laboratory, dose 1x10\^6 cells/ kg to 3x10\^6 cells/kg
Fludarabine (160 mg/m2)
Melphalan (50 mg/m2)
The CliniMACS® CD34 Reagent System is a medical device that is used in vitro to select and enrich specific cell populations is manufactured by Miltenyi Biotec
4-6ng/mL
40mg/kg
Dose 0.24 mg/kg, manufactured by Genzyme
Single-use vials contain either 300 mcg or 480 mcg filgrastim at a fill volume of 1.0 mL or 1.6 mL
Thiotepa 10 mg/kg
MMF 1000 mg BID
Ruxolitinib 5 mg BID
Stanford University
Stanford, California, United States
RECRUITINGDetermine the GVHD-free relapse-free survival (GRFS) post-HCT ( Arm-A)
Clinical effect will be assessed as graft vs host disease (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. The outcome will be measured in Arm A only.
Time frame: 12 months
Determine the overall survival (OS) post-HCT ( Arm-B)
Overall survival is measured as number of participants alive. Alive at the time of last observation will be censored.
Time frame: 2 years
Incidence of Grade III-IV acute GVHD
Acute GVHD will be staged and graded per Mount Sinai Acute GvHD International Consortium (MAGIC) Standardization criteria.
Time frame: At baseline, day +30, 60, 90, 180, year 1 and year 2
The incidence and timing of primary graft failure
Primary graft failure is defined as being alive with donor CD3 chimerism \<5% at day +30 after transplant without recovery of neutrophils (i.e. without achieving an absolute neutrophil count \[ANC\] ≥ 500/mm3 for 3 consecutive days) at Day+28
Time frame: 2 years from the Day 0 (day of CD34+ peripheral blood stem cell infusion
Donor CD3 chimerism at Day+60 post-HCT
Defined as a percentage on donor CD3 cells chimerism at day +60 after transplantation.
Time frame: 2 years from the Day 0 (day of CD34+ peripheral blood stem cell infusion)
GVHD-relapse-free survival
Clinical effect will be assessed as graft vs host disease (GVHD)-free relapse free survival (GRFS), GVHD-free is defined as no GVHD grade 3 and 4, and relapse free survival is defined as survival at 12 months without relapse.
Time frame: 12 months
Overall survival
Overall survival is measured as number of participants alive. Alive at the time of last observation will be censored.
Time frame: 12 months
Secondary graft failure
Secondary graft failure (defined by donor CD3 chimerism \<5% at day +30 after transplant) and neutrophil engraftment followed by subsequent decline in ANC \< 500/mm3 unresponsive to growth factor therapy, by Day +100
Time frame: from Day 0 through 100 days
Treatment-emergent adverse events (TEAs)
TEAEs will be categorized by the System Organ Class and preferred term and will be graded according to the CTCAE version 5.0
Time frame: from Day 0 through 100 days
Acute GVHD (all grades)
Acute GVHD (all grades) will be reported
Time frame: from Day 0 through 100 days
Steroid-refractory acute GVHD
Steroid refractory acute GVHD will be defined as per the EBMT-NIH-CIBMTR Task Force position statement
Time frame: within 3-5 days of therapy onset
Non-relapse mortality (NRM)
Non-relapse mortality is measured as number of participants died without relapse/ recurrent disease. Subjects without evidence of relapse/progression at last follow-up date or date of death will be censored.
Time frame: 12 months
Disease-free survival (DFS)
Overall survival is measured as number of participants alive and in remission. Alive in remission at the time of last observation will be censored.
Time frame: 12 months
Chronic GVHD (limited or extensive)
Chronic GVHD will be diagnosed per 2014 International NIH Chronic GVHD Diagnosis and Staging Consensus Working Group criteria (Jagasia 2015). Chronic GVHD scored according to the first day of chronic GVHD onset will be used to calculate cumulative incidence curves. Subjects will be followed for 2 years from the Day 0 (day of CD34+ peripheral blood stem cell infusion) for estimation of cGVHD incidence.
Time frame: from Day 0 through Year 2
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