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BACKGROUND: Controlled-rate freezing (CRF) followed by storage in liquid nitrogen is employed by most centers as the standard procedure for peripheral blood progenitor cell (PBPC) cryopreservation. Uncontrolled-rate freezing (URF) at −80°C is more simple, time-saving, less expensive, and, possibly, as effective as CRF. The aim of this retrospective analysis was to compare CRF and URF in childhood transplantation. STUDY DESIGN AND METHODS: A total of 54 PBPC transplants performed in 39 children aged 3 to 16 years (median, 9.5 years) were analyzed: 23 transplants in 16 children with CRF versus 31 transplants performed in 23 children with −80°C URF. All grafts contained at least 2 × 106 per kg unselected CD34+ cells, enumerated before freezing. Nucleated cells infused ranged from 1.32 × 108 to 4.3 × 108 per mL with a median of 3.1 × 108 per mL. Cryoprotectant solution consisted of a final dimethyl sulfoxide (DMSO) concentration of 10 percent DMSO with autologous plasma. RESULTS: The two study groups did not differ in terms of timing of neutrophil and platelet recovery or transfusion requirements. Adverse events related to graft infusion, severe complications, and transplant-related mortality were not significantly different between CRF and URF groups. In both groups only mild adverse events were observed during graft administration. URF procedures, however, were simpler and less expensive. At a median follow-up of 72 months, no secondary myelodysplasia was observed in either group. CONCLUSION: Our analysis suggests that URF is safe and effective in the pediatric population. [ABSTRACT FROM AUTHOR]

Describes the use of percutaneous radial artery catheter for peripheral blood progenitor cell collection in pediatric patients. Lack of a suitable vascular access for drawing blood; Increase of the risk of autoimmune diseases; Prevention of complications associated with central venous accesses.