- After preservation, the number of clusters was closely related to the number of CD34 cells and the number of TNC with r respectively 0.87 and 0.6 with p <0.05. - Preservation time does not affect the amount and quality of stem cells * Posibility to use community UCBSC units - Based on the minimum dose standard of total nucleated cell, umbilical cord blood stem cells store transplant responses for patients with an average weight of 65.6 ± 20.0 kg.