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Clinical Trial Summary

This study evaluates the frequency of occurrence, severity, and response to treatment by a chemical agent, notably the dimerizer AP1903 (Bellicum Pharmaceuticals compagny), in the case of acute Graft versus Host Disease (aGvHD) occurring after the administration of T-lymphocytes expressing iCASP9 and concomitantly to a bone marrow graft depleted in B- and T-lymphocytes


Clinical Trial Description

Haematopoietic transplantation may result in serious complications, notably graft versus host disease (GvHD). T-lymphocyte depletion of the bone marrow graft is able to prevent GvHD, while increasing the risk of rejection and reducing the antileukaemic effect of the graft (graft versus leukaemia, GvL). In a previous study, the investigators showed that the ex vivo transfer of the Herpes simplex thymidine kinase suicide gene (HSV-TK) into the graft's T lymphocytes prior to reinjection was not associated with immediate toxicity, while allowing for the prolonged recirculation of genetically modified cells (GMC) and control of induced GvHD by ganciclovir (GCV). In addition, this study revealed the existence of GMC resistant to GCV, an immunodeficiency of transduced cells, as well as an increased risk of Epstein-Barr virus (EBV)-induced lymphoproliferative disease. To overcome these difficulties, investigators improved the methodology of producing GMC by using a new vector (pMSCV-iCASP9-2A-ΔCD19) whose susceptibility gene was of human origin and associated with a human surface marker (non-functional) enabling the cell selection process. Moreover, the demonstration that the induced GvHD in this setting could be controlled by the administration of GCV alone led to significantly increase the number of genetically modified T-lymphocytes administered and omit cyclosporin prophylaxis of GvHD. This phase I study will include 12 patients and will be conducted according the dose escalation method (2.10e6, 5.10e6 and 10.10e6 GMC / kg respectively for levels I, II & III). GMC will be prepared in the Cell and Tissue Engineering Laboratory (advanced therapy medicinal products departement) of the french Blood center (EFS) in Besançon, France, and sent to the transplantation department. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT02849886
Study type Interventional
Source Centre Hospitalier Universitaire de Besancon
Contact Eric DECONINCK, MD, PhD, HDR
Phone +33381668404
Email edeconinck@chu-besancon.fr
Status Recruiting
Phase Phase 1/Phase 2
Start date April 10, 2019
Completion date December 2021

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