CD34 and anemia: Although the infused CD34+ cell dose (1.0 × 106/kg) was below the generally recommended threshold for optimal engraftment (≥ 2.0 × 106 CD34+/kg), previous reports have shown that engraftment can still be achieved with doses in this range, often with slower hematologic recovery and prolonged anemia or thrombocytopenia (17, 18).