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Depletion of αβ+ T and B Cells Using the CliniMACS Prodigy: Results of 10 Graft-Processing Procedures from Haploidentical Donors

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Background: Depletion of TCRαβ+ T cells and B cells with the CliniMACS Plus® has been used for haploidentical hematopoietic stem cell transplantation for a decade. The depletion procedure is time and labour demanding and with variable reported efficiencies. Recently, an automated procedure was launched for the CliniMACS Prodigy® (Miltenyi Biotec) but reported data are scarce. Here, we report the results of the first ten TCRαβ+ and B cell depletion procedures for clinical use performed at our centre.

Materials and Methods: All transplants were from a parent to a child. Collection of peripheral blood stem cells was performed after filgrastim mobilisation by use of the Spectra Optia® (TerumoBCT) set on the MNC program. Because of insufficient hematopoietic stem cell mobilisation, 1 donor received additional plerixafor.

Results: We performed ten uncomplicated processes with the CliniMACS Prodigy. We found the results of the depletion procedures satisfactory with a median log reduction of TCRαβ+ cells of -4.21 (range -3.98 to -4.74), resulting in a median number of TCRαβ+ cells in the depleted product of 28.6 × 10<sup>3</sup>/kg recipient weight (range 14.9-69.7 × 10<sup>3</sup>/kg). The median CD34 recovery was 83% (range 70-100). To achieve a sufficient number of CD34+ cells, we performed an additional CD34+ enrichment procedure using the CliniMACS Plus for 3 patients. The B cell depletion was slightly less efficient with a median log reduction of -3.72 (range -2.83 to -4.20).

Conclusion: Overall, we found the TCRαβ and CD19 depletion procedure on the CliniMACS Prodigy easy to handle and reliable, providing reproducible good results.

Original languageEnglish
JournalTransfusion Medicine and Hemotherapy (Print Edition)
Issue number6
Pages (from-to)446-449
Number of pages4
Publication statusPublished - 2019

ID: 58993119