T-Regulatory Cell and CD3 Depleted Double Umbilical Cord Blood Transplantation in Hematologic Malignancies

2014-08-27 03:12:11 | BioPortfolio


This is a unique dose-escalation trial that will titrate doses of umbilical cord blood (UCB) Treg and CD3+ Teff cells with the goal of infusing as many CD3+ Teff cells as possible without conferring grade II-IV acute graft-versus-host disease (GVHD).

In this study, the investigators propose to add UCB Treg and UCB CD3+ Teff cells to the two TCD UCB donor units with the goal of transplanting as many CD3+ Teff cells as possible without reintroducing risk of acute GVHD. The investigators hypothesize that Treg will permit the reintroduction of CD3+ Teff cells that will provide a bridge while awaiting HSC T cell recovery long term. The co-infusion of Treg will prevent GVHD without the need for prolonged pharmacologic immunosuppression.


Based on prior studies, the first patient will start at lowest dose combination (3 x 10^6/kg of Treg and 3 x 10^6/kg of CD3+ Teff cells). One patient will be entered at each level with a minimum of 35 days to observe the patient prior to moving to the next dose level. (1) If GVHD does not occur, a "successful step", then the CD3+ Teff cell dose will increase to the next higher level for the next patient; (2) If GVHD occurs, a "failed step", then Treg dose will increase to the next higher level for the next patient. It would take a minimum of 5 (if no GVHD) and maximum of 9 patients (if GVHD is observed at each level) to complete all Treg:CD3+ Teff cell combinations.

An additional 10 patients will be enrolled to verify that this reflects the optimal combination and evaluate its safety profile.

Study Design

Allocation: Non-Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment


Hematologic Malignancy


Treg cells, CD3+ Teff cells, Fludarabine, Cyclophosphamide, Total body irradiation, Umbilical cord blood transplantation


Masonic Cancer Center, University of Minnesota
United States


Not yet recruiting


Masonic Cancer Center, University of Minnesota

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:12:11-0400

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