Abstract
Optimal timing of peripheral blood progenitor cell (PBPC) harvest to collect maximal stem cell numbers is unknown. We assessed the progenitor cell content in 128 PBPC harvests from 21 patients primed with chemotherapy and granulocyte macrophage-colony stimulating factor (GM-CSF) in relation to absolute neutrophil count (ANC) at collection time. Samples were obtained by leukapheresis during rebound from chemotherapy-induced neutropenia while receiving GM-CSF, and assayed by flow cytometry for CD34+ and by colony assays for CFU-GM and BFU-E. The CD34+ cell concentrations per sample tended to be greater at an ANC <1,000 mm<sup>3</sup> and decreased with rising ANC (p = 0.001). The CFU-GM and BFU-E concentrations per sample remained relatively constant with rising ANC (p = 0.72, p = 0.90, respectively). Total CD34+ cell number per harvest per kg slightly increased with ANC levels (p = 0.044) whereas the total CFU-GM and the total BFU-E per kilogram increased more modestly with rising ANC (p < 0.001, p < 0.001, respectively). We conclude that after priming with chemotherapy and GM-CSF, PBPC could be collected at different absolute neutrophil counts without greatly affecting total CD34+ cell numbers. The greater concentration of CD34+ progenitor cells at a lower ANC together with the CFU-GM and BFU-E peaking with higher ANC suggest a less mature progenitor cell population at lower ANC levels.
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