Two cases of clump formation after thawing of hematopoietic progenitor cell products for transplantation
DOI:
https://doi.org/10.46765/2675-374X.2025v6n1e257Keywords:
Hematopoietic Progenitor Cells, Cryopreservation, Cell AggregationAbstract
While rare, clump formation has been described in the thawing of cryopreserved hematopoietic progenitor cell products intended for transplantation. When this occurs, it presents a significant challenge to the transplant team, potentially influencing the viability and safety of the product. Though the exact cause of clumping in thawed products remains unknown, studies have linked clump formation with the occurrence of adverse events. This report aimed to describe two cases of clump formation in thawed apheresis products observed in our processing laboratory, detailing the procedures followed and the outcomes achieved.
References
Cordoba R, Arrieta R, Kerguelen A, Hernandez-Navarro F. The occurrence of adverse events during the infusion of autologous peripheral blood stem cells is related to the number of granulocytes in the leukapheresis product. Bone Marrow Transplant. 2007;40(11):1063-7. https://doi.org/10.1038/sj.bmt.1705861
Siegenthaler MA, Vu DH, Ebnöther M, Ketterer N, Luthi F, Schmid P, Bargetzi M, Gasparini D, Tissot JD. ‘Agglutination and flocculation’ of stem cells collected by apheresis due to cryofibrinogen. Bone Marrow Transplant. 2004;33(7):765-7. https://doi.org/10.1038/sj.bmt.1704420
Mandanas RA, Kratochvil K, Garner T, Selby GB. Formation of fibrin clots in cryopreserved stem cell bags during thawing procedure: lack of impact on engraftment in autologous stem cell transplantation. Bone Marrow Transplant. 1999;23(3):303-4. https://doi.org/10.1038/sj.bmt.1701553
Reich-Slotky R, Patel N, Dael S, Semidei-Pomales M, Stephens H, Reich M, Schwartz J. Postthaw clotting of peripheral blood stem cell products due to insufficient anticoagulant. J Clin Apher. 2009;24(6):265-8. https://doi.org/10.1002/jca.20220
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2025 JOURNAL OF BONE MARROW TRANSPLANTATION AND CELLULAR THERAPY

This work is licensed under a Creative Commons Attribution 4.0 International License.
License and Copyright Policy
The Journal of Bone Marrow Transplantation and Cellular Therapy (JBMTCT) adopts an open access policy, ensuring that all published articles are freely available to the public without restrictions.
-
License
- All articles published in JBMTCT are licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
- This license permits anyone to:
- Share: Copy and redistribute the material in any medium or format.
- Adapt: Remix, transform, and build upon the material for any purpose, even commercially.
- The only requirement is that appropriate credit is given to the original authors and source, a link to the license is provided, and any changes made are indicated.
More information about the license can be found here: Creative Commons Attribution 4.0 International License.
-
Authors’ Rights
- Authors retain the copyright to their work.
- Authors grant JBMTCT the right to publish the work and make it openly accessible online.
- Authors are free to:
- Distribute the published version of their article (e.g., post it on personal websites or institutional repositories).
- Use the article in future works, presentations, or derivative publications, as long as the original publication in JBMTCT is properly acknowledged.
-
No Embargo
- There is no embargo period; articles are made freely available immediately upon publication.
-
Ethical Use
- Users of JBMTCT articles must ensure proper citation of the authors and the journal.
- Articles must not be used in ways that violate ethical or legal standards.
-
Disclaimer
- While JBMTCT aims to ensure the accuracy and reliability of published content, the journal and its editors are not responsible for the consequences of its use.
For any questions regarding our licensing terms, please contact us at: journalbmtct@sbtmo.org.br
JBMTCT is committed to the principles of open access to advance knowledge and scientific collaboration.