title: Negative selection of chronic lymphocytic leukaemia cells using a bifunctional rosette-based antibody cocktail.
abstract: BACKGROUND
  High purity of tumour samples is a necessity for accurate genetic and expression analysis and is usually achieved by positive selection in chronic lymphocytic leukaemia (CLL).
  
  
  RESULTS
  We adapted a bifunctional rosette-based antibody cocktail for negative selection of B-cells for isolating CLL cells from peripheral blood (PB). PB samples from CLL patients were split into aliquots. One aliquot of each sample was enriched by density gradient centrifugation (DGC), while the other aliquot of each sample was incubated with an antibody cocktail for B-cell enrichment prior to DGC (RS+DGC). The purity of CLL cells after DGC averaged 74.1% (range: 15.9 - 97.4%). Using RS+DGC, the purity averaged 93.8% (range: 80.4 - 99.4%) with 23 of 29 (79%) samples showing CLL purities above 90%. RNA extracted from enriched CLL cells was of appropriately high quality for microarray analysis.
  
  
  CONCLUSIONS
  This study confirms the use of a bifunctional rosette-based antibody cocktail as an effective method for the purification of CLL cells from peripheral blood.
authors.affiliation: Department of Pathology, Peter MacCallum Cancer Centre, St Andrews Place, Melbourne, Victoria 3002, Australia. salim.essakali@qiagen.com
authors.forename: Salim
authors.initials: S
authors.lastname: Essakali
authors.forename: Dennis
authors.initials: D
authors.lastname: Carney
authors.forename: David
authors.initials: D
authors.lastname: Westerman
authors.forename: Peter
authors.initials: P
authors.lastname: Gambell
authors.forename: John F
authors.initials: JF
authors.lastname: Seymour
authors.forename: Alexander
authors.initials: A
authors.lastname: Dobrovic
mesh_terms: D000906:Antibodies / Q000378:metabolism; D001402:B-Lymphocytes / Q000166:cytology*; D002469:Cell Separation / Q000379:methods*; D002499:Centrifugation, Density Gradient; D004912:Erythrocytes / Q000378:metabolism; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000097:blood / Q000175:diagnosis*
chemical_list: D000906:Antibodies