title: Minimal residual disease detection in mantle cell lymphoma: methods and significance of four-color flow cytometry compared to consensus IGH-polymerase chain reaction at initial staging and for follow-up examinations.
abstract: BACKGROUND
  The increasing application of multi-color flow cytometry assays for staging and follow-up in mantle cell lymphoma necessitates that the specificity and sensitivity of this technique are evaluated. Data from prospective clinical trials comparing the clinical applicability of flow cytometry to routine diagnostic methods and to polymerase chain reaction are currently lacking.
  
  
  METHODS
  We applied a standardized four-color flow cytometry assay to 281 prospectively collected peripheral blood and bone marrow samples from 98 patients with mantle cell lymphoma participating in a multi-center clinical trial and compared the results to those obtained with conventional clinical staging and consensus primer IGH-polymerase chain reaction.
  
  
  RESULTS
  The maximum sensitivity of flow cytometry using light chain restriction in CD19+CD5+ subpopulations was 8.0 x 10(-4) while flow cytometry that relied on immunophenotypic aberrations was less sensitive (2.4 x 10(-3)). Mantle cell lymphoma cells were detected in 87.3% of 110 pre-treatment samples from 84 patients by flow cytometry and in 94.5% by polymerase chain reaction. Eight out of 84 patients (9.5%) diagnosed clinically as having stage II or III disease showed peripheral blood or bone marrow involvement according to flow cytometry, thus documenting more advanced disease. At follow-up residual lymphoma cells were detected by flow cytometry and concordantly by polymerase chain reaction in 10/171 samples (5.8%); however, 31 follow-up samples (18.1%) were positive for minimal residual disease according only to polymerase chain reaction analysis.
  
  
  CONCLUSIONS
  The sensitivity of four-color flow cytometry is comparable to that of IGH-polymerase chain reaction at initial staging but is less sensitive at follow-up after immuno-chemotherapy. Both techniques are highly valuable methods for accurate initial staging.
authors: Second Department of Medicine, Chemnitzstrasse 33, D-24116 Kiel, Germany. s.boettcher@med2.uni-kiel.de
authors: Sebastian
authors: S
authors: Böttcher
authors: Matthias
authors: M
authors: Ritgen
authors: Sebastian
authors: S
authors: Buske
authors: Stefan
authors: S
authors: Gesk
authors: Wolfram
authors: W
authors: Klapper
authors: Eva
authors: E
authors: Hoster
authors: Wolfgang
authors: W
authors: Hiddemann
authors: Michael
authors: M
authors: Unterhalt
authors: Martin
authors: M
authors: Dreyling
authors: Reiner
authors: R
authors: Siebert
authors: Michael
authors: M
authors: Kneba
authors: Christiane
authors: C
authors: Pott
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001856:Bone Marrow Examination / Q000379:methods; D002880:Chromosomes, Human, Pair 11 / Q000235:genetics / Q000648:ultrastructure; D002883:Chromosomes, Human, Pair 14 / Q000235:genetics / Q000648:ultrastructure; D003131:Combined Modality Therapy; D016384:Consensus Sequence; D005260:Female; D005434:Flow Cytometry / Q000379:methods*; D005500:Follow-Up Studies; D005803:Genes, Immunoglobulin; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D016130:Immunophenotyping / Q000379:methods; D020522:Lymphoma, Mantle-Cell / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging / Q000379:methods*; D018365:Neoplasm, Residual / Q000175:diagnosis; D015514:Oncogene Proteins, Fusion / Q000235:genetics; D016133:Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D014178:Translocation, Genetic
chemical_list: C529133:IGH-CCND1 fusion protein, human; D007143:Immunoglobulin Heavy Chains; D015514:Oncogene Proteins, Fusion