Peripheral blood stem cell collection with a blood cell separator

Area of Science:

• Hematology
• Transplant Medicine
• Cellular Therapy

Background:

• Peripheral blood stem cell (PBSC) transplantation is a crucial therapy for malignant nonmyeloid diseases.
• Optimizing PBSC collection efficiency and product quality is essential for successful engraftment.
• Understanding the impact of apheresis parameters during specific recovery phases is vital.

Purpose of the Study:

• To evaluate the efficacy of peripheral blood stem cell collections using an apheresis system in patients with malignant nonmyeloid diseases.
• To assess the influence of different centrifugal separation factors on product yield and purity.
• To compare collection outcomes after chemotherapy alone versus chemotherapy with granulocyte-colony-stimulating factor (G-CSF) mobilization.

Main Methods:

• Forty-three patients with malignant nonmyeloid diseases underwent PBSC collections.
• Collections were performed during the white blood cell (WBC) recovery phase post-chemotherapy.
• Four centrifugal separation factors were tested, processing 1.5 patient blood volumes per procedure.

Main Results:

• After chemotherapy alone, mean yields were 0.8 x 10(8) WBCs/kg and 2.3 x 10(4) CFU-GM/kg.
• Increasing centrifugal separation factor improved mononuclear cell (52-70%) and CFU-GM (55-68%) collection efficiency.
• G-CSF mobilization resulted in higher yields (2 x 10(8) WBCs/kg, 28 x 10(4) CFU-GM/kg) but increased neutrophil contamination.

Conclusions:

• Centrifugal separation factor significantly impacts PBSC collection efficiency and product composition.
• G-CSF mobilization enhances stem cell yield but requires careful monitoring for product purity.
• Optimized apheresis settings can improve the quality of PBSC collections for transplantation.