Kaplan-Meier probability of achieving platelet engraftment for the patients who received at least 2 × 10⁶ CD34⁺ cells/kg in the infused product. Of the 130 patients infused, the number of CD34⁺ cells per kilogram was not assessed in 5 patients and were less than 2 × 10⁶ CD34⁺ cells/kg for 17 patients. For the remaining 108 patients with at least 2 × 10⁶CD34⁺ cells/kg infused, probabilities of the time to achieve platelet engraftment (transfusion independence) were the same for the unselected arm (n = 53) and the selected arm (n = 55). Similar results occurred for the probabilities of the time to achieve platelet recovery.