Predictive factors for successful peripheral blood stem cell mobilization and collection in children.

Factors affecting the success of peripheral blood stem cell collection (SCC) in children are not well characterized. We reviewed 218 stem cell collections among 199 pediatric donors, of which 35 were from healthy sibling donors and 164 were for autologous collections. Successful SCC, defined as a CD34 cell count of ≥2 × 10 /kg of recipient weight per intended transplant, occurred in 188 of 199 donors (94%). Ideal SCC defined ≥5 × 10 CD34 cells/kg of recipient per intended transplant, occurred in 147 (74%) patients. Failure of collection occurred in 11 (6%) patients and was significantly associated with an autologous collection for a brain tumor diagnosis (P = .003) and a pre-apheresis peripheral blood (PB) CD34 count <20 × 10 cells/L (P = .002). Ideal SCC was significantly associated with age < 10 years (P = .01) and pre-apheresis PB-CD34 count ≥20 × 10 cells/L (P < .0001). Factors associated with failure of SCC may be identified in advance of the collection procedure allowing appropriate counselling of patients as well as anticipatory guidance for multiple collections or justify the preemptive use of stem cell mobilizing agents.