Timing of the appearance of multipotential and committed haemopoietic progenitors in peripheral blood after mobilization in patients with lymphoma

The pattern of emergence of multipotential (CFU‐A) and committed (CFU‐GM and BFU‐E) progenitor cells in peripheral blood has been examined in patients with Hodgkin’s disease and non‐Hodgkin’s lymphoma. Mobilization protocols used chemotherapy with or without granulocyte colony‐stimulating factor (n=8 and n=5, respectively). In all patients, the numbers of CFU‐A, CFU‐GM and BFU‐E peaked simultaneously, rather than sequentially, suggesting that marrow regeneration after these mobilization protocols occurred from progenitors at all stages of differentiation. We conclude that peripheral blood stem cell harvest strategies based on peak values for total progenitor numbers will also capture maximum numbers of multipotential progenitors. However, the variable relationship between CFU‐A and CFU‐GM numbers suggests that overall progenitor cell numbers can give only a broad estimate of the absolute numbers of multipotential progenitors in an individual harvest.