Leukapheresis collections from days 5 plus 6 plus 7 (relative to G-CSF administration) for each patient cohort: G-CSF alone (G-CSF, ▪); SCF 5 μg/kg/d plus G-CSF (SCF 5, ); SCF 10 μg/kg/d plus G-CSF (SCF 10, ▨); SCF 15 μg/kg/d plus G-CSF (SCF 15, ); and SCF pretreatment (SCF pre, □). Results are mean ± SE for d7 GM-CFC (A), d14 GM-CFC (B), BFU-E (C), and CD34⁺ cells (D). The apparent decrease in GM-CFC collected in Cohort D was interpreted as reflecting the smaller number of patients in this cohort, the wide interindividual variation, and the increased number of patients with stage III disease in this group.