title: Neurotrophic receptor, tropomyosin-related kinase B as an independent prognostic marker in gastric cancer patients.
abstract: OBJECTIVE
  Neurotrophic receptor tyrosine kinase TrkB has been associated with clinical outcome and chemotherapy resistance in neuroblastoma and certain human malignancies. Recent studies have focused on the association between metastatic potential and TrkB expression in tumor cells.
  
  
  METHODS
  To determine the role of TrkB in gastric cancer, we analyzed TrkB mRNA levels by real-time reverse transcription polymerase chain reaction in 90 patients with gastric cancer. TrkB levels were correlated with clinicopathological variables. The association between TrkB and overall survival was evaluated by univariate and multivariate analyses.
  
  
  RESULTS
  The mean TrkB level in gastric cancer tissue was 2.96 (range, 0-27.1). Thirty-eight (42%) of 90 patients showed detectable TrkB levels, whereas the remainder had no detectable TrkB. There was no significant association between clinicopathological variables and TrkB positivity. TrkB level was significantly associated with extent of lymph node metastasis in node positive patients (P = 0.03). TrkB positivity (n = 38) was significantly correlated with worse patient survival (P = 0.03). Multivariate analysis showed TrkB to be an independent prognostic parameter for overall survival (P = 0.04).
  
  
  CONCLUSIONS
  TrkB is an independent prognostic marker in patients with gastric cancer and appears to be associated with metastatic potential.
authors.affiliation: Department of Gastrointestinal and Pediatric Surgery, Mie University Graduate School of Medicine, Mie, Japan. qouji@clin.medic.mie-u.ac.jp
authors.forename: Koji
authors.initials: K
authors.lastname: Tanaka
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Mohri
authors.forename: Junji
authors.initials: J
authors.lastname: Nishioka
authors.forename: Minako
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Masaki
authors.initials: M
authors.lastname: Ohi
authors.forename: Chikao
authors.initials: C
authors.lastname: Miki
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Tonouchi
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nobori
authors.forename: Masato
authors.initials: M
authors.lastname: Kusunoki
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000401:mortality / Q000473:pathology / Q000556:secondary*; D000368:Aged; D014408:Biomarkers, Tumor / Q000378:metabolism*; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000556:secondary; D008207:Lymphatic Metastasis; D008297:Male; D015999:Multivariate Analysis; D009367:Neoplasm Staging; D010534:Peritoneal Neoplasms / Q000556:secondary; D011379:Prognosis; D012333:RNA, Messenger / Q000032:analysis; D020813:Receptor, trkB / Q000235:genetics / Q000378:metabolism*; D017475:Receptors, Nerve Growth Factor / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D015996:Survival Rate
chemical_list: D014408:Biomarkers, Tumor; D012333:RNA, Messenger; D017475:Receptors, Nerve Growth Factor; D020813:Receptor, trkB