title: Prognostic factors in node-negative colorectal cancer: a retrospective study from a prospective database.
abstract: OBJECTIVE
  There is a need to identify a subgroup of high-risk patients with node-negative colorectal cancer who have a poor long-term prognosis and may benefit from adjuvant therapies. The aim of this study was to evaluate the prognostic impact of clinical and pathological parameters in a retrospective study from a prospective, continuous database of homogenously treated patients.
  
  
  METHODS
  This study included 362 patients operated in a single institution for Dukes A and B (node-negative) colorectal cancer. The median follow-up was 140 months. The prognostic value of 13 clinical and pathological parameters was investigated.
  
  
  RESULTS
  Multivariate analysis identified six independent prognostic factors: age at time of diagnosis (hazard ratio (HR) = 1.076), number of lymph nodes removed (HR = 0.948), perineural invasion (HR = 2.173), venous invasion (HR = 1.959), lymphatic vessel invasion (HR = 2.126), and T4 stage (HR = 5.876).
  
  
  CONCLUSIONS
  These parameters could be useful in identifying patients with high-risk node-negative colorectal cancer who should be presented to adjuvant therapy.
authors.affiliation: Service de Chirurgie Viscérale et Digestive CHU Angers, Angers Cedex 9, France.
authors.forename: Gregoire
authors.initials: G
authors.lastname: Desolneux
authors.forename: Pascal
authors.initials: P
authors.lastname: Burtin
authors.forename: Emilie
authors.initials: E
authors.lastname: Lermite
authors.forename: Roberto
authors.initials: R
authors.lastname: Bergamaschi
authors.forename: Antoine
authors.initials: A
authors.lastname: Hamy
authors.forename: Jean Pierre
authors.initials: JP
authors.lastname: Arnaud
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000473:pathology*; D019992:Databases as Topic; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008198:Lymph Nodes / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011379:Prognosis; D012189:Retrospective Studies
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