Factors associated with parameters of engraftment potential of umbilical cord blood.
BACKGROUND
Umbilical cord blood (UCB) is an acceptable source of hematopoietic cells for transplantation with success being associated with the nucleated cell count (NCC), CD34+ cells, and colony-forming unit-granulocyte-macrophage (CFU-GM) content infused. A total of 1033 UCB samples with neonatal and paternal characteristics that might influence hematopoietic content were examined.


METHODS
UCB samples were screened, processed, and reevaluated for the above cell counts. These parameters of engraftment potential were analyzed for associations with neonatal and parental characteristics.


RESULTS
Postprocessed NCCs (median, 6.53 x 10(8)+/- 2.80 x 10(8) SD; mean 7.30 x 10(8)), CD34+ counts (median, 2.02 x 10(6) +/- 2.20 x 10(6) SD; mean, 2.65 x 10(6); r = 0.66; p < 0.001), and CFU-GM content (median, 2.65 x 10(5) +/- 3.16 x 10(5) SD; mean, 3.54 x 10(5); r = 0.61; p < 0.001) all were strongly interrelated. Both initial volume (median, 77.5 +/- 26.2 mL SD; mean, 81.9 mL) and initial NCC (median, 9.75 x 10(8) +/- 4.88 x 10(8) SD; mean, 10.9 x 10(8)) correlated well with postprocessed NCC (r = 0.60; r = 0.90; p < 0.01), CD34+ count (r = 0.40; r = 0.63; p < 0.01), and CFU-GM content (r = 0.38; r = 0.59; p < 0.01), with a stronger relationship seen with initial NCC. Infant birth weight (specifically, >3000 g), but not sex, gestational age, or cytomegalovirus status correlated strongly with collection volume and UCB cell counts. Units from minority volunteers contained relatively smaller volumes and hematopoietic content.


CONCLUSIONS
UCB banks should emphasize selecting the heaviest infants and processing large-volume units with high NCCs to optimize hematopoietic potential. Minority recruitment should be encouraged with consideration given to inherent racial differences in cell counts. There does not appear to be a significant relationship between other neonatal and parental characteristics and that of engraftment potential.
George
Thomas J
TJ
University of Florida, College of Medicine, Gainesville, Florida, USA. georgtj@medicine.ufl.edu
Sugrue
Michele W
MW
George
Sarah N
SN
Wingard
John R
JR
D018952:Antigens, CD34; D001724:Birth Weight; D001771:Blood Banks; D001781:Blood Component Removal; D036101:Cord Blood Stem Cell Transplantation; D046148:Donor Selection / Q000379:methods; D005260:Female; D005312:Fetal Blood / Q000166:cytology*; D005865:Gestational Age; D006085:Graft Survival; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D007231:Infant, Newborn; D007958:Leukocyte Count; D008297:Male; D011247:Pregnancy; D012189:Retrospective Studies; D014019:Tissue Donors
D018952:Antigens, CD34