title: Increased numbers of total nucleated and CD34+ cells in blood group O cord blood: an analysis of neonatal innate factors in the Korean population.
abstract: BACKGROUND
  We analyzed neonatal factors that could affect hematopoietic variables of cord blood (CB) donated from Korean neonates.
  
  
  METHODS
  The numbers of total nucleated cells (TNCs), CD34+ cells, and CD34+ cells/TNCs of CB in neonates were compared according to sex, gestational age, birth weight, birth weight centile for gestational age, and ABO blood group.
  
  
  RESULTS
  With 11,098 CB units analyzed, blood group O CB showed an increased number of TNCs, CD34+ cells, and CD34+ cells/TNCs compared with other blood groups. Although TNC counts were lower in males, no difference in the number of CD34+ cells was demonstrated because the number of CD34+ cells/TNCs was higher in males. An increase in the gestational age resulted in an increase in the number of TNCs and decreases in the number of CD34+ cells and CD34+ cells/TNCs. The numbers of TNCs, CD34+ cells, and CD34+ cells/TNCs increased according to increased birth weight centile as well as birth weight.
  
  
  CONCLUSIONS
  CB with blood group O has unique hematologic variables in this large-scale analysis of Korean neonates, although the impact on the storage policies of CB banks or the clinical outcome of transplantation remains to be determined.
authors.affiliation: Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Hye Ryun
authors.initials: HR
authors.lastname: Lee
authors.forename: Jeong Su
authors.initials: JS
authors.lastname: Park
authors.forename: Sue
authors.initials: S
authors.lastname: Shin
authors.forename: Eun Youn
authors.initials: EY
authors.lastname: Roh
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Yoon
authors.forename: Kyou Sup
authors.initials: KS
authors.lastname: Han
authors.forename: Byung Jae
authors.initials: BJ
authors.lastname: Kim
authors.forename: Robert W
authors.initials: RW
authors.lastname: Storms
authors.forename: Nelson J
authors.initials: NJ
authors.lastname: Chao
mesh_terms: D000017:ABO Blood-Group System / Q000378:metabolism*; D000328:Adult; D018952:Antigens, CD34 / Q000378:metabolism*; D001724:Birth Weight / Q000502:physiology; D005260:Female; D005312:Fetal Blood / Q000166:cytology*; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007723:Korea; D007962:Leukocytes / Q000166:cytology / Q000378:metabolism*; D008297:Male; D011247:Pregnancy; D055815:Young Adult
chemical_list: D000017:ABO Blood-Group System; D018952:Antigens, CD34