According to the model, approximately 30 × 106 cells/L and 50 × 106 cells/L of PB-CD34+ cells are required to have a probability of ≥0.90 to collect 2 × 106 AP-CD34+ cells/kg on the first day of apheresis for the neuroblastoma tumor type and other tumor types, respectively. This evidence concerns the gene CD34 and neuroblastoma.