title: Purging of autologous peripheral-blood stem cells using CD34 selection does not improve overall or progression-free survival after high-dose chemotherapy for multiple myeloma: results of a multicenter randomized controlled trial.
abstract: OBJECTIVE
  Although high-dose chemotherapy supported by autologous peripheral-blood progenitor-cell (PBPC) transplantation improves response rates and survival for patients with multiple myeloma, all patients eventually develop progressive disease after transplantation. It has been hypothesized that depletion of malignant plasma cells from autografts may improve outcome by reducing infused cells contributing to relapse.
  
  
  METHODS
  A randomized phase III study using the CEPRATE SC System (Cellpro, Bothell, WA) to enrich CD34(+) autograft cells and passively purge malignant plasma cells was completed in 190 myeloma patients randomized to receive an autograft of CD34-selected or unselected PBPCs.
  
  
  RESULTS
  After CD34 selection, tumor burden was reduced by 1.6 to 6.0 logs (median, 3.1), with 54% of CD34-enriched products having no detectable tumor. Median time to count recovery, number of transfusions, transplantation-related mortality, and days in hospital were equivalent between the two transplantation arms. With a median follow-up of 37 months, 33 patients (36%) in the selected and 34 patients (35%) in the unselected arm had died (P =.784). Median overall survival in the selected arm was reached at 50 months and is not reached at this time in the unselected arm (P =.78). Median disease-free survival was 100 versus 104 weeks (P =.82), with 67% of patients in the selected arm and 66% of patients in the unselected arm relapsing.
  
  
  CONCLUSIONS
  This phase III trial demonstrates that although CD34 selection significantly reduces myeloma cell contamination in PBPC collections, no improvement in disease-free or overall survival was achieved.
authors.affiliation: Princess Margaret Hospital, Toronto, Ontario, Canada. k.stewart@uhnres.utoronto.ca
authors.forename: A K
authors.initials: AK
authors.lastname: Stewart
authors.forename: R
authors.initials: R
authors.lastname: Vescio
authors.forename: G
authors.initials: G
authors.lastname: Schiller
authors.forename: O
authors.initials: O
authors.lastname: Ballester
authors.forename: S
authors.initials: S
authors.lastname: Noga
authors.forename: H
authors.initials: H
authors.lastname: Rugo
authors.forename: C
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authors.lastname: Freytes
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authors.initials: E
authors.lastname: Stadtmauer
authors.forename: S
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authors.lastname: Tarantolo
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authors.lastname: Sahebi
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authors.lastname: Stiff
authors.forename: J
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authors.lastname: Meharchard
authors.forename: R
authors.initials: R
authors.lastname: Schlossman
authors.forename: R
authors.initials: R
authors.lastname: Brown
authors.forename: H
authors.initials: H
authors.lastname: Tully
authors.forename: M
authors.initials: M
authors.lastname: Benyunes
authors.forename: C
authors.initials: C
authors.lastname: Jacobs
authors.forename: R
authors.initials: R
authors.lastname: Berenson
authors.forename: M
authors.initials: M
authors.lastname: White
authors.forename: J
authors.initials: J
authors.lastname: DiPersio
authors.forename: K C
authors.initials: KC
authors.lastname: Anderson
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authors.lastname: Berenson
mesh_terms: D000328:Adult; D000368:Aged; D018952:Antigens, CD34 / Q000032:analysis*; D000970:Antineoplastic Agents / Q000627:therapeutic use; D016465:Bone Marrow Purging / Q000379:methods*; D003131:Combined Modality Therapy; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009101:Multiple Myeloma / Q000276:immunology / Q000401:mortality / Q000628:therapy*; D009360:Neoplastic Cells, Circulating / Q000276:immunology; D016133:Polymerase Chain Reaction; D016016:Proportional Hazards Models; D015996:Survival Rate
chemical_list: D018952:Antigens, CD34; D000970:Antineoplastic Agents