title: Prognostic importance of isolated peritumoral lymphangiosis carcinomatosa in lymph-node-negative colorectal carcinoma.
abstract: BACKGROUND
  The prognostic value of microinvasion of lymph vessels and lymph nodes has become increasingly important; there is a wide range in prognosis of patients with nodal-negative tumor stages after curative resection for colorectal cancer.
  
  
  OBJECTIVE
  Detection of the prognostic importance of isolated lymph-vessel invasion as a possible precursor of lymph-node metastasis in patients with nodal-negative tumor stages.
  
  
  METHODS
  Retrospective analysis of 894 patients with R0-resected colorectal cancer, uni- and multivariate analysis of tumorbiologic prognostic factors, immunohistochemical proof of tumor cells in negative lymph nodes (pN0) using the epithelial marker HEA-125 (human epithelial antigen).
  
  
  RESULTS
  The incidence of lymph-vessel invasion (L) was 37.7% in total. A pN0,L1 status was found in 144 patients (16.1% of all analyzed patients). Comparing patients with pN0,L1 status to those with pN+,L0 status showed that both groups have similar rates of overall survival and tumor relapse. Lymph-node status, lymph-vessel invasion, depth of tumor infiltration (pT) stage, and age were detected as independent prognostic factors by multivariate analysis. After reanalysis of 54 cases primarily classified as 18.5% pN0,L1, microinvasion in lymph nodes was detected by immunohistochemistry. We found a higher rate of tumor relapse (approximately 20%) for those patients. In regard to the overall survival rate, however, there was no difference when compared to patients without immunohistochemical proof of microinvasion.
  
  
  CONCLUSIONS
  Isolated lymph-vessel invasion in nodal-negative tumor stages and a lymph-node-positive tumor status have equivalent prognostic importance in colorectal cancer.
authors.affiliation: Department of Abdominal, Thoracic and Endocrine Surgery, Klinikum Nürnberg-Nord, Prof. Ernst-Nathan Strasse 1, 90419 Nürnberg, Germany. w.meyer@klinikum-nuernberg.de
authors.forename: W
authors.initials: W
authors.lastname: Meyer
authors.forename: A
authors.initials: A
authors.lastname: Awad-Allah
authors.forename: B B
authors.initials: BB
authors.lastname: Steinhäuser
authors.forename: C
authors.initials: C
authors.lastname: Jurowich
authors.forename: A
authors.initials: A
authors.lastname: Kaiser
authors.forename: C
authors.initials: C
authors.lastname: Gebhardt
mesh_terms: D000368:Aged; D015179:Colorectal Neoplasms / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D016015:Logistic Models; D008198:Lymph Nodes / Q000098:blood supply / Q000473:pathology; D008207:Lymphatic Metastasis; D008297:Male; D009364:Neoplasm Recurrence, Local; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D015996:Survival Rate