PERIPHERAL-BLOOD STEM-CELLS MOBILIZED FROM PATIENTS WITH ACUTE MYELOID-LEUKEMIA HAVE DIFFERENT PLATELET REPOPULATING ABILITIES COMPARED WITH THOSE MOBILIZED FROM PATIENTS WITH OTHER DISEASES
Mm. Roberts et al., PERIPHERAL-BLOOD STEM-CELLS MOBILIZED FROM PATIENTS WITH ACUTE MYELOID-LEUKEMIA HAVE DIFFERENT PLATELET REPOPULATING ABILITIES COMPARED WITH THOSE MOBILIZED FROM PATIENTS WITH OTHER DISEASES, Bone marrow transplantation, 18(1), 1996, pp. 41-45
Peripheral blood stem cell (PBSC) transplantation gives rapid recovery
of neutrophils and platelets and sustained haemopoiesis. However in p
atients with acute myeloid leukaemia (AML) platelet recovery has a dis
tinctive rapid rise and then secondary fall between 3 to 8 weeks post-
transplant. This study compares platelet and neutrophil recovery after
PBSC transplantation in 15 patients with AML and 29 patients with oth
er diseases consecutively transplanted in a single unit. PBSC were col
lected during recovery from consolidation chemotherapy in AML patients
and after cyclophosphamide or cytokine administration in the other pa
tient groups, Mononuclear cell numbers collected were similar but CFU-
GM numbers were greater from the AML patients, A significant secondary
fall occurred only in the platelet count and only in AML patients, Lo
ng-term recovery of the platelet count was the same in AML as in the o
ther patients, In AML patients, the fall was the same in the long term
remitters as in those who eventually relapsed, Previous studies have
not demonstrated a difference in type of precursors mobilized by diffe
ring methods, but have not included AML patients. Megakaryocyte precur
sors were assayed in this study and showed no consistent differences i
n number between patient groups however pre-progenitor assays are not
yet established especially in the megakaryocytic lineage, The possible
explanation for this secondary fall in AML patients is discussed.