Title
TCR-a/b+ and CD19+ depleted KIR/KIR ligand-mismatched Haploidentical Hematopoietic Stem Cell Transplant and Zoledronate for Pediatric Relapsed/Refractory Hematologic Malignancies and High Risk Solid Tumors

Description
This phase I trial studies the safety of transplantation with a haploidentical donor peripheral blood stem cell graft depleted of TCRaB+ cells and CD19+ cells in conjunction with the immunomodulating drug, Zoledronate, given in the post-transplant period to treat pediatric patients with relapsed or refractory hematologic malignancies or high risk solid tumors.

CONDITIONING REGIMENS: Patients with high-risk leukemia will receive myeloablative conditioning with anti-thymocyte globulin intravenously (IV) over 4-6 hours on days -12 through -9, Fludarabine IV over 30 minutes on days -8 through -5, Thiotepa IV every every 12 hours on day -4 and Total Body Irradiation (TBI) on days -3 through -1. All other patients receive reduced intensity conditioning consisting of anti-thymocyte globulin intravenously (IV) over 4-6 hours on days -12 through -9, fludarabine IV over 30 minutes on days -8 through -5, thiotepa IV over 4 hours every 12 hours on day -4, and melphalan IV on days -3 and -2.

PERIPHERAL BLOOD STEM CELL TRANSPLANTATION: Patients undergo TCR-alpha/beta+ and CD19+ depleted KIR/KIR ligand-mismatched haploidentical donor peripheral blood stem cell transplantation on day 0. If the graft contains less than 4 x 10^6 CD34+ cells/kg, a second HSC graft may be administered.

PROPHYLAXIS FOR GVHD: Patients receiving a graft containing > 25 x 10^3 CD3+ TCR alpha/beta+ cells receive mycophenolate mofetil IV twice daily over 2 hours on days 1 to 30 with a rapid taper. Patients with TCR alpha/beta+ cells exceeding 100,000/kg also receive tacrolimus IV continuously or orally (PO) every 12 hours on days 0-90 with a taper at the discretion of the Principal Investigator.

ZOLEDRONATE ADMINISTRATION: Patients will receive five doses of Zoledronate (IV) at 28 day intervals beginning on Day +28 post-HSCT.

Follow-up assessments will occur after transplantation.

Objective
Primary Outcome Measures:

Incidence of acute graft versus host disease (GVHD) [ Time Frame: Within 100 days post-transplantation ]

Incidence of graft failure [ Time Frame: At day 28 ]

Immune reconstitution [ Time Frame: Up to 1 year ]


Immune reconstitution outcomes, as determined by immune cell analysis.


Performance of the CliniMACS Reagent System utilizing the CliniMACS TCRαβ-biotin and CliniMACS CD19 reagent to produce a graft with defined cell content. [ Time Frame: Day 0 ]


The performance of the CliniMACS Reagent System will be evaluated by measuring the number of viable stem cells, TCRαβ+ cells, TCRγδ+ cells, NK cells and B cells in the hematopoietic stem cell graft.

Treatment Experimental: TCRaB+/CD19+ depleted Haploidentical HSCT+ Zoledronate
Patients with high-risk leukemia (who are at least one year of age and who have not received TBI as conditioning for a previous HSCT) will receive myeloablative conditioning with ATG, Fludarabine, Thiotepa, and TBI. All other subjects will undergo a reduced-intensity conditioning regimen consisting of ATG, Fludarabine, Thiotepa, and Melphalan prior to transplant with a KIR/KIR ligand mismatched haploidentical donor peripheral blood stem cell graft depleted of TCRaB+ and CD19+ cells. Patients will receive 5 doses of zoledronate (at 28 day intervals) starting 28 days after stem cell transplant.

Key Eligibility For full study eligibility, please see this study's ClinicalTrials.gov record.

Applicable Disease Sites
Brain/Central Nervous System; Hematologic cancers, other; Leukemia; Lymphoma; Neuroblastoma; Sarcoma

Participating Institutions
UW Health University Hospital