Circulating CD34+ cells to predict the adequate harvest of peripheral blood progenitor cells in platinum-based chemotherapy
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Objective: The aim of this study was to clarify the appropriate timing for peripheral blood progenitor cells (PBPC) harvesting after platinum-based mobilization chemotherapy by measurement of the circulating CD34+ cell concentrations. Patients and Methods: PBPC were collected for autotransplantation via a total of 68 leukaphereses in 16 patients with gynecological cancer. Circulating CD34+ cell concentrations were measured by CD34-side scatter parameter analysis. Results: Data could be fitted into a linear regression line described by the equation y=0.33+4.14×x (R2=0.256), where y=the number of harvested colony-forming unit granulocyte macrophage (CFU-GM (×105/kg) and x=the percentage of circulating CD34+ cells and y=1.747+44.53×x (R2= 0.475), where y=the number of harvested CD34+ cells (×106/kg) and x=the percentage of circulating CD34+ cells. Failure to mobilize sufficient CFU-GM numbers (>1×105/kg) occurred in 29 of 31 leukaphereses when the percentage of circulating CD34+ cells was less than 0.10%. Conclusions: Harvesting procedure may be avoided when circulating CD34+ cells showed less than 0.10% after platinum-based mobilization chemotherapy.
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