title: Number of nodes examined and staging accuracy in colorectal carcinoma.
abstract: OBJECTIVE
  The objective of this study was to determine the number of nodes that need to be examined to accurately reflect the histology of the regional lymphatics in colorectal carcinoma.
  
  
  METHODS
  Patients undergoing curative resection for T2 and T3 colorectal cancer between 1992 and 1996 were reviewed. Pathologic data from these patients were entered into a computerized database for storage, retrieval, and analysis. The major outcome measured was the number of nodes that need to be examined to achieve a node-positive rate consistent with that reported in the National Cancer Data Base (NCDB) report.
  
  
  RESULTS
  The number of nodes examined ranged from 0 to 78 (mean, 17 nodes). Node-negative patients had fewer nodes examined (mean, 14 nodes) than node-positive patients (mean, 20 nodes; P =.003). The entire sample had a node-positive rate of 38.8% (95% confidence interval [CI], 32% to 45.5%), not statistically different from that in the NCDB report. When at least 14 nodes were examined, the percent of patients with at least one positive node was 33.3% (95% CI, 24.6% to 42.3%), not statistically different from the NCDB report.
  
  
  CONCLUSIONS
  In a sample of patients statistically similar to the sample in the NCDB report, the examination of at least 14 nodes after resection of T2 or T3 carcinoma of the colon and rectum will accurately stage the lymphatic basin.
authors.affiliation: Department of Surgery, University of Hawaii School of Medicine, and Research Administration and Department of Pathology, Queen's Medical Center, Honolulu, HI 96813, USA. wongjh@jabsom.biomed.hawaii.edu
authors.forename: J H
authors.initials: JH
authors.lastname: Wong
authors.forename: R
authors.initials: R
authors.lastname: Severino
authors.forename: M B
authors.initials: MB
authors.lastname: Honnebier
authors.forename: P
authors.initials: P
authors.lastname: Tom
authors.forename: T S
authors.initials: TS
authors.lastname: Namiki
mesh_terms: D003110:Colonic Neoplasms / Q000473:pathology* / Q000601:surgery; D019992:Databases as Topic; D006801:Humans; D008197:Lymph Node Excision; D008198:Lymph Nodes / Q000473:pathology* / Q000601:surgery; D008207:Lymphatic Metastasis / Q000473:pathology*; D009367:Neoplasm Staging / Q000379:methods* / Q000592:standards; D012004:Rectal Neoplasms / Q000473:pathology* / Q000601:surgery