Double umbilical cord blood transplantation for children and adolescents.
Umbilical cord blood transplantation (UCBT) with two units has been conducted with promising results in adults to overcome the limitation of low cell numbers. In an attempt to improve the outcomes, double UCBT was performed in children and adolescents. Sixty-one patients, including 44 acute leukemia, and 17 other hematologic diseases, received double UCBT. Donor-type engraftment achieved in 82% of patients. Except one patient with persistent mixed chimerism of two units, other 49 patients showed dominancy of one unit and only the CFU-GM was significant factor influencing dominancy. The event-free survival (EFS) of leukemia and other hematologic disease were 59% and 53%, respectively, and the EFS of acute leukemia patients who received transplant in first or second CR (68.6%) was significantly better than in those with advanced disease (22.2%) (P = 0.007). Among the factors influencing outcomes, low cell dose difference between two units (TNC difference/TNC of large unit <15%) were associated with higher TRM, relapse, and lower EFS. Double UCBT was a promising modality of transplant in children and adolescence. However, engraftment and other results were not so satisfactory yet. To improve the outcomes, development of new selection guideline, probably including cell dose difference between two units and technology to enhance engraftment and reduce transplantation-related mortality are warranted.
Department of Pediatrics, Cancer Research Institute, Seoul National University College of Medicine, Daehangno, Chongno-gu, Republic of Korea.
Hyoung Jin
HJ
Kang
Keon Hee
KH
Yoo
Ji Won
JW
Lee
Hyery
H
Kim
Soo Hyun
SH
Lee
Ki Woong
KW
Sung
Kyung Duk
KD
Park
Hong Hoe
HH
Koo
Hee Young
HY
Shin
Hyo Seop
HS
Ahn
D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D036101:Cord Blood Stem Cell Transplantation / Q000009:adverse effects / Q000379:methods*; D018572:Disease-Free Survival; D005260:Female; D005312:Fetal Blood / Q000166:cytology*; D006086:Graft vs Host Disease / Q000473:pathology / Q000517:prevention & control; D006402:Hematologic Diseases / Q000401:mortality / Q000517:prevention & control / Q000601:surgery*; D006801:Humans; D007223:Infant; D007938:Leukemia / Q000401:mortality / Q000517:prevention & control / Q000601:surgery*; D008297:Male; D012008:Recurrence; D018183:Transplantation Chimera; D019172:Transplantation Conditioning; D016896:Treatment Outcome