A randomized controlled clinical trial to determine the optimum duration of G-CSF priming prior to BM stem cell harvesting.
BACKGROUND
Harvesting of hemopoietic stem cells (HSC) from G-CSF-primed BM for autologous transplantation is an alternative to collection of unprimed BM or G-CSF-primed peripheral blood (PB). However, the optimum number of days of G-CSF administration for this purpose is unknown. We set out to determine whether cell yields could be optimized by varying the number of days of G-CSF administration prior to BM stem cell harvesting.


METHODS
We conducted a randomized controlled single-center trial of 6 days (the standard) vs. 4 days of G-CSF administration and compared yields of total nucleated cells (TNC), CD34(+) HSC and CFU-GM cells per kilogram patient body weight. Statistical analysis was by Student's t-test.


RESULTS
Twenty-four patients were enrolled; 13 received 6 days and 11 received 4 days of G-CSF administration. Analysis of the first harvest aspirate showed higher proportions of CD34(+) HSC (P=0.02) and CFU-GM (P=0.03) in the 4-day group. For the 6-day and 4-day groups, respectively, the median yield of TNC/kg was 6.5 x 10(8) and 5.4 x 10(8) (P=0.28), of CD34(+) cells/kg 0.56 x 10(6) and 0.98 x 10(6) (P=0.04) and of CFU-GM cells/kg 1.66 x 10(5) and 1.55 x 10(5) (P=0.75).


CONCLUSIONS
These results suggest that by 6 days the HSC-stimulating effect of G-CSF has passed its peak and that 4 days should be adopted as the standard for G-CSF priming prior to BM stem cell harvesting for autologous transplantation.
Lowenthal
R M
RM
Department of Haematology/Oncology, Royal Hobart Hospital. Hobart, Tasmania, Australia. R.M.Lowenthal@utas.edu.au
Ragg
S J
SJ
Anderson
J
J
Nicholson
L
L
Harrup
R A
RA
Tuck
D
D
D000293:Adolescent; D000328:Adult; D000368:Aged; D018952:Antigens, CD34 / Q000378:metabolism; D016026:Bone Marrow Transplantation / Q000379:methods*; D002469:Cell Separation / Q000379:methods; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000008:administration & dosage / Q000494:pharmacology*; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D014182:Transplantation, Autologous
D018952:Antigens, CD34; D016179:Granulocyte Colony-Stimulating Factor