title: Peripheral blood stem cell tumor cell contamination and survival of neuroblastoma patients.
abstract: OBJECTIVE
  Contribution of peripheral blood stem cell (PBSC) contaminating tumor cells to subsequent relapse and overall survival of neuroblastoma patients remains controversial.
  
  
  METHODS
  Neuroblastoma cell contamination of 27 PBSC harvests from stage IV neuroblastoma patients was assessed by quantitative RT-PCR for both tyrosine hydroxylase (TH) and GD2 synthase (GD2-s). The effect of PBSC contamination on survival was then analyzed.
  
  
  RESULTS
  Seven PBSC tested negative for both markers; 19 were positive for GD2-s, 6 for TH, with 5 positive for both. Survival of the 20 patients with positive PBSC did not differ from that of the patients with negative PBSC (log-rank test, P = 0.134 and 0.218 for event-free survival and overall survival, respectively). By considering the TH and GD2-s results independently, a borderline (P = 0.053) negative effect on event-free survival was observed in patients reinfused with GD2-s-positive PBSC. When the status at transplant was taken into account, only the event-free survival of the patients rescued when in complete remission with GD2-s-negative PBSC was better, although not significantly, than that of patients infused with GD2-s-positive PBSC.
  
  
  CONCLUSIONS
  Our results obtained in a small cohort of homogeneously treated stage IV patients suggest that patient survival is not affected by PBSC contamination with the exception of a borderline negative effect on event-free survival in patients rescued when in complete remission.
authors.affiliation: Laboratory of Oncology, Gaslini Institute, Largo Gaslini 5, 16147 Genoa, Italy. mariavaleriacorrias@ospedale-gaslini.ge.it
authors.forename: Maria Valeria
authors.initials: MV
authors.lastname: Corrias
authors.forename: Riccardo
authors.initials: R
authors.lastname: Haupt
authors.forename: Barbara
authors.initials: B
authors.lastname: Carlini
authors.forename: Stefano
authors.initials: S
authors.lastname: Parodi
authors.forename: Lucia
authors.initials: L
authors.lastname: Rivabella
authors.forename: Alberto
authors.initials: A
authors.lastname: Garaventa
authors.forename: Vito
authors.initials: V
authors.lastname: Pistoia
authors.forename: Sandro
authors.initials: S
authors.lastname: Dallorso
mesh_terms: D016465:Bone Marrow Purging / Q000379:methods; D002469:Cell Separation / Q000379:methods; D002675:Child, Preschool; D018572:Disease-Free Survival; D005260:Female; D006412:Hematopoietic Stem Cells / Q000473:pathology*; D006801:Humans; D008297:Male; D017350:N-Acetylgalactosaminyltransferases / Q000235:genetics* / Q000378:metabolism; D009360:Neoplastic Cells, Circulating / Q000473:pathology*; D009447:Neuroblastoma / Q000201:enzymology / Q000401:mortality* / Q000628:therapy; D016133:Polymerase Chain Reaction / Q000379:methods; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D015996:Survival Rate; D014182:Transplantation, Autologous; D014446:Tyrosine 3-Monooxygenase / Q000235:genetics* / Q000378:metabolism
chemical_list: D012334:RNA, Neoplasm; D014446:Tyrosine 3-Monooxygenase; D017350:N-Acetylgalactosaminyltransferases; C023220:(N-acetylneuraminyl)-galactosylglucosylceramide N-acetylgalactosaminyltransferase