Yildirim M, Sayin S, Ertas Z, Ayyildiz E, Aksoyoglu I, Avcu F, Ural AU, Ayli M. Apheresis product total CD34
+ cell count prediction at peripheral stem cell collection via a formula: A multicenter study.
Transpl Immunol 2024;
86:102111. [PMID:
39214288 DOI:
10.1016/j.trim.2024.102111]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 08/12/2024] [Accepted: 08/27/2024] [Indexed: 09/04/2024]
Abstract
INTRODUCTION
Effective mobilization of Stem Cells(SCs) to peripheral blood (PB) is crucial for obtaining sufficient CD34+ cell numbers via apheresis. The ratio of pre-apheresis PB CD34+ cells is the best parameter for predicting the product CD34+ cell count. However, quantitating CD34+ PB cells requires flow cytometry, which usually takes two or more hours to obtain the results. We hypothesized that the product CD34+ cell count could be predicted using the counts of white blood cells (WBCs), mononuclear cells (MNCs), and pre-apheresis CD34+ cells. A formula that achieves this would substantially affect the efficiency and effectiveness of apheresis. We, therefore, aimed to estimate the number of CD34+ cells in the product using a formula that incorporates pre-apheresis PB WBC, MNC, and CD34+ cell counts and product WBC and MNC counts.
METHODS
We examined the results of 373 leukapheresis procedures for SC mobilization. Effective separation of CD34+ PBSCs (count/μL) via apheresis was estimated using the following formula: [Product WBC (count/μL) × MNC (count/μL) × pre-apheresis CD34+ cell (percentage/μL)] ÷ [PB WBC count/μL × PB MNC (count/μL)].
RESULTS
A strong correlation was observed between the CD34+ cell count calculated using our formula and the post-apheresis CD34+ cell count measured via flow cytometry (R = 0.939, based on linear regression analysis). In the subgroup analysis, this correlation was observed for all the disease subgroups and healthy donors.
CONCLUSION
We developed a formula that predicts the product CD34+ cell count and is useful for determining whether a second apheresis procedure will be required.
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