Histopathology of bone marrow reconstitution after umbilical cord blood transplantation for hematological diseases.
To study hematopoietic reconstitution in umbilical cord blood transplantation (CBT), bone marrow (BM) histology was investigated in 35 biopsies after bone marrow transplantation (BMT) and in 40 biopsies after CBT. BM biopsies were obtained at different times after transplantation and were evaluated for cellularity, number of megakaryocytes and CD34-positive cells, and fibrosis. In biopsies up to 29 days after BMT, cellularity was increased and megakaryocytes were observed, but at 29 days after CBT, biopsies showed severe cellular depletion and almost no megakaryocytes. In addition, fewer CD34-positive cells were observed after CBT compared to after BMT. After day 30 after CBT, hematopoietic recovery of the BM was gradually observed and after day 100 after transplantation, no essential differences were observed between BMT and CBT. Hematopoietic recovery of the BM after CBT was delayed compared to that after BMT, but engraftment of donor cells after CBT was also observed in histopathologically. To the best of the authors' knowledge this is the first histopathological description of BM reconstitution after CBT.
Maeda
Takashi
T
Second Department of Pathology and Department of Hematology, Showa University School of Medicine, Tokyo, Japan. tmaeda@med.showa-u.ac.jp
Shiozawa
Eisuke
E
Mayumi
Homma
H
Usui
Takako
T
Nakashima
Hidetoshi
H
Hattori
Norimichi
N
Adachi
Daisuke
D
Saito
Bungo
B
Yanagisawa
Kouji
K
Matsuda
Isao
I
Nakamaki
Tsuyoshi
T
Tomoyasu
Shigeru
S
Yamochi-Onizuka
Toshiko
T
Takimoto
Masafumi
M
Ota
Hidekazu
H
D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D001853:Bone Marrow / Q000473:pathology*; D016026:Bone Marrow Transplantation; D002452:Cell Count; D036101:Cord Blood Stem Cell Transplantation; D005260:Female; D006085:Graft Survival; D006402:Hematologic Diseases / Q000473:pathology* / Q000628:therapy*; D006410:Hematopoiesis / Q000502:physiology*; D006801:Humans; D008297:Male; D008533:Megakaryocytes / Q000166:cytology; D008875:Middle Aged; D020127:Recovery of Function; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome