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Clinical Trial Summary

Patients with hematologic malignancies will receive myeloablative chemotherapy followed by stem cell rescue with bone marrow or hematopoietic peripheral blood stem cells collected by apheresis from a filgrastim- (G-CSF)-mobilized haploidentical related-donor, ie, hematopoietic peripheral blood stem cell transplant (HSCT).


Clinical Trial Description

This is dose-escalation study intended to evaluate the use of classification determinant 15-positive (CD15+), CD4+, CD127dim, and FoxP3+ regulatory T-cells (T-reg cells) supplemented by conventional T-cells (T-con cells), to enhance the efficacy of allogeneic (CliniMACS CD34+ selected) hematopoietic stem cell transplantation (allo-HSCT), in the setting of leukemia, lymphoma, and myelodysplastic syndrome (MDS). This study investigates amelioration of the impaired immune recovery and address the significant relapse incidence in the haploidentical HSCT setting.

Pre-transplant myeloablative conditioning will be melphalan; thiotepa; fludarabine and rabbit antithymocyte globulin (rATG).

Stem cell rescue will be with CD34+ selected cells. The rescue infusion will be supplemented with infusions of regulatory T-cells (T-reg) and conventional T-cells (T-con) from the same donor collection, on Treatment Days 14 and 16 respectively. CD34+ cell infusion day is Treatment Day 0.

T-reg cells are those cells enriched by immunomagnetic selection of CD25+ cells, and further purified by flow cytometric cell sorting for the CD15+, CD4+, CD127dim, FoxP3+ cell population. These cells are an enriched but naturally-occurring T-cell population.

T-con cells are unseparated/unfractionated cells, ie, as collected by the peripheral blood stem cells apheresis procedure.

Post-transplant follow-up is for 5 years. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT01050764
Study type Interventional
Source Stanford University
Contact
Status Terminated
Phase Phase 1/Phase 2
Start date June 2009
Completion date June 2014

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