Abstract:
:Transplantation of peripheral blood stem cells (PBSC), positively and/or negatively selected immediately after harvest, has become a widely applied therapeutic option in hematological or oncological patients. The following case of peripheral blood stem cell transplantation represents the first case of successful transplantation of PBSC, cryopreserved twice and purged after cryopreservation. PBSC were harvested in a 44-year-old female patient with a low-grade non-Hodgkin's lymphoma stage IV after mobilization with chemotherapy and G-CSF. A total number of 15.2 x 10(6) CD34+ cells/kg bodyweight was harvested with a 36.9% contamination of tumor cells coexpressing CD5 and CD20. After subsequent chemotherapy cycles and cyclophosphamide mobilization, only 0.77 x 10(6) CD34+ cells/kg bodyweight, not sufficient for transplantation, were achieved after positive selection. Therefore, 10.8 x 10(6) cryopreserved CD34+ cells/kg bodyweight were thawed and a positive selection was carried out with the BAXTER Isolex 300i machine. Before additional negative selection, the 0.77 x 10(6) positively selected CD34+ cells/kg bodyweight from the second mobilization were added. A total quantity of 4.4 x 10(6) CD34+ cells/kg bodyweight with a purity of 93.1% representing a recovery of 38% was obtained. Cells were again cryopreserved, stored and retransfused after conditioning the patient with TBI and high-dose cyclophosphamide. The patient engrafted with a WBC count > 1000/microliter on day eight and a platelet count > 20,000/microliter without transfusion support on day 12 post-transplantation. This case indicates that purging procedures can successfully be carried out with cryopreserved cell material and that purified CD34+ cells can be cryopreserved a second time before transplantation, without affecting their hematopoietic capacity.
journal_name
Ann Hematoljournal_title
Annals of hematologyauthors
Humpe A,Riggert J,Wolf C,Binder C,Köhler Mdoi
10.1007/s002770000243subject
Has Abstractpub_date
2001-02-01 00:00:00pages
109-12issue
2eissn
0939-5555issn
1432-0584journal_volume
80pub_type
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