title: Telomerase activity by TRAP assay and telomerase RNA (hTR) expression are predictive of outcome in neuroblastoma.
abstract: BACKGROUND
  Recent studies have associated telomerase with prognostic factors and survival in neuroblastoma.
  
  
  METHODS
  We examined telomerase activity by telomere repeat amplification protocol (TRAP) and expression of the RNA component of telomerase (hTR) by Northern blotting in 106 primary neuroblastoma tumors and 22 established cell lines.
  
  
  RESULTS
  Overall survival at 5 years for all 106 tumors was significantly better for patients with undetectable TRAP (75% vs. 59%; P = 0.03) or low hTR expression (84% vs. 43%; P < 0.0001), and especially for patients whose tumors had both low hTR expression and undetectable TRAP (all patients, 91% vs. 54%, P = 0.0002; for 17 stage IV-S tumors, 100% vs. 72%, P = 0.04). Strong expression of hTR was seen in 22 cell lines from aggressive tumors, and all maintained telomere length, but 3/22 were TRAP negative.
  
  
  CONCLUSIONS
  These data suggest that both hTR expression and telomerase activity via the TRAP assay should be performed concurrently to predict survival in neuroblastoma patients, particularly in stage 4-S.
authors: Division of Hematology-Oncology, Department of Pediatrics, Children's Hospital Los Angeles, University of Southern California School of Medicine, Los Angeles, California 90027-0700, USA.
authors: L M
authors: LM
authors: Choi
authors: N W
authors: NW
authors: Kim
authors: J J
authors: JJ
authors: Zuo
authors: R
authors: R
authors: Gerbing
authors: D
authors: D
authors: Stram
authors: J N
authors: JN
authors: Lukens
authors: K K
authors: KK
authors: Matthay
authors: R C
authors: RC
authors: Seeger
authors: C P
authors: CP
authors: Reynolds
mesh_terms: D002648:Child; D006801:Humans; D009447:Neuroblastoma / Q000201:enzymology* / Q000401:mortality*; D011379:Prognosis; D012313:RNA / Q000032:analysis; D015996:Survival Rate; D019098:Telomerase / Q000235:genetics* / Q000378:metabolism*
chemical_list: D012313:RNA; D019098:Telomerase