title: Comparison of progenitor cell collection on day 4 or day 5 after steady-state stimulation with G-CSF alone in breast cancer patients: influence on CD34+ cell yield, subpopulation, and breast cancer cell contamination.
abstract: To determine the influence of apheresis timing on CD34+ cell yield, subpopulation, and breast cancer cell contamination, 48 women with breast cancer were stimulated from steady-state hematopoiesis in a prospective but nonrandomized study with 2 x 5 microg/kg G-CSF s.c. alone, and apheresis was started either on day 4 (n = 24) or day 5 (n = 24). Forty-eight women with breast cancer (stage II/III, n = 30; stage IV; n = 12; inflammatory, n = 6) and a median age of 44 years were well balanced between the two groups. In group I, aphersis was started on day 4 and additionally performed on day 5 after G-CSF stimulation, and in group II, apheresis was started on day 5. CD34+ cell count and CD34+ cell subpopulation were determined according to international criteria. Breast cancer cell contamination was detected by immunocytology. The median CD34+ cell harvest on day 4 was 3.3 x 10(6)/kg body weight (range 0.5-12.8) and 6 x 10(6)/kg BW (range 0.3-30) for patients starting on day 5 (p = 0.01). Those patients starting on day 4 achieved a median CD34+ cell count of 4 x 10(6)/kg (range 0.7-13) on day 5 (NS). Twenty-one percent of group I and 71% of group II achieved >5 x 10(6)/kg BW CD34+ cells in the first apheresis, whereas <2.5 x 10(6)/kg BW CD34+ cells in the first apheresis were observed in 38% of group I and 16% of group II. No differences were observed between the CD34+ cell subpopulations, CD34+/CD38+ (10.5% versus 10.5%) and CD34+/Thyl+ (1.5% versus 1.8%). The CD34+ cell harvest from consecutive collecting on days 4 and 5 was nearly identical to the harvest starting on day 5 (6.4 versus 6 x 10(6)/kg). Collecting CD34+ progenitor cells after stimulation with G-CSF alone on day 5 results in a significantly higher cell yield than starting collecting on day 4. No differences in respect to breast cancer cell contamination and CD34+ cell subpopulation were observed.
authors.affiliation: Bone Marrow Transplantation, University of Hamburg, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Kröger
authors.forename: W
authors.initials: W
authors.lastname: Krüger
authors.forename: H
authors.initials: H
authors.lastname: Renges
authors.forename: W
authors.initials: W
authors.lastname: Zeller
authors.forename: C
authors.initials: C
authors.lastname: Rauhöft
authors.forename: C
authors.initials: C
authors.lastname: Löliger
authors.forename: A R
authors.initials: AR
authors.lastname: Zander
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D000328:Adult; D015703:Antigens, CD; D018952:Antigens, CD34 / Q000097:blood; D000943:Antigens, Differentiation / Q000097:blood; D001781:Blood Component Removal / Q000379:methods* / Q000592:standards; D001943:Breast Neoplasms / Q000473:pathology* / Q000628:therapy*; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000008:administration & dosage* / Q000494:pharmacology; D006801:Humans; D007958:Leukocyte Count; D008562:Membrane Glycoproteins; D008875:Middle Aged; D009000:Monocytes / Q000166:cytology; D009244:NAD+ Nucleosidase / Q000097:blood; D011446:Prospective Studies; D013234:Stem Cells; D013997:Time Factors
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D000943:Antigens, Differentiation; D008562:Membrane Glycoproteins; D016179:Granulocyte Colony-Stimulating Factor; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; D009244:NAD+ Nucleosidase; D051997:ADP-ribosyl Cyclase 1