 - Cord blood units must be matched with patient at 4, 5, or 66 HLA loci, class I antigenic class II allelic levelwith a minimum of 3.5 x 107 TNCkg recipient body weight in the pre-thawed fraction and with 2.5x107 TNCkg for the richest cord blood unit and 1.5x107 TNCkg for the poorest blood unit in case of 2 cord blood units 