The maximum amount of pegfilgrastim that can be safely administered in single or multiple doses has not been determined. Single subcutaneous dose of 300 mcg/kg has been administered to limited number of heathy volunteers and patients with non-small cell lung cancer without serious adverse effects. These patients experienced a mean maximum absolute neutrophil count (ANC) of 55 x 109/L, with a corresponding mean maximum WBC of 67 x 109/L. The absolute maximum ANC observed was 96 x 109/L with a corresponding absolute maximum WBC observed of 120 x 109/L. The duration of leukocytosis ranged from 6 to 13 days. The effectiveness of leukapheresis in the management of symptomatic individuals with pegfilgrastim-induced leukocytosis has not been studied.