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Related Experiment Videos

Using point-of-care CD34 enumeration to optimize PBSC collection conditions.

S J Noga1, G B Vogelsang, S C Miller

  • 1The Johns Hopkins Hematopoietic and Therapeutic Support Service, Baltimore, MD 21205, USA.

Cytotherapy
|May 25, 2002
PubMed
Summary
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Microvolume fluorimetry (MVF) enables rapid CD34+ cell monitoring for optimal peripheral blood stem cell (PBSC) collection. This point-of-care method streamlines apheresis, reduces costs, and ensures high-quality PBSC grafts for durable engraftment.

Area of Science:

  • Hematology
  • Transplant Immunology
  • Biotechnology

Background:

  • Optimal peripheral blood stem cell (PBSC) grafts require 4-5 x 10^6 CD34+ cells/kg for durable engraftment.
  • Point-of-care (POC) CD34 tracking during PBSC mobilization can optimize product yield and collection timing.
  • Microvolume fluorimetry (MVF) was evaluated for its utility in optimizing PBSC mobilization and harvest efficiency.

Purpose of the Study:

  • To assess the effectiveness of MVF in optimizing PBSC mobilization and harvest.
  • To determine if MVF can shorten the standard 6-hour apheresis collection time.
  • To develop and prospectively validate a CD34-based algorithm for predicting apheresis duration.

Main Methods:

  • Absolute CD34+ cell counts were determined using the IMAGN 2000 and STELLer CD34 assay with a 50 µL sample volume.

Related Experiment Videos

  • A peripheral blood (PB) CD34-based algorithm was developed from 30 patients undergoing PBSC mobilization.
  • The algorithm was prospectively applied to 50 hematologic malignancy (HM) patients to guide apheresis collection.

    • Main Results:

    • An algorithm predicted collection times of 6, 4, or 2 hours based on CD34+ cell counts (11-20, 21-49, or ≥50 cells/µL, respectively).
    • 43 of 50 patients mobilized successfully, achieving optimal CD34+ cell counts with a single apheresis procedure.
    • Apheresis charges were reduced by 33-66% for the majority of patients; 47% required only 2 hours, and 28% required 4 hours.

    Conclusions:

    • Absolute PB CD34+ measurement via MVF provides a rapid, reliable method for obtaining optimal PBSC products.
    • MVF meets the criteria for a point-of-care procedure, requiring minimal technical expertise.
    • This approach facilitates efficient PBSC collection, leading to rapid trilineage engraftment.