title: Prognostic value of multimarker analysis in stage III colorectal cancer: one step forward towards an individualized therapy decision.
abstract: BACKGROUND
  Recently, we have analyzed new prognostic markers in colorectal cancer including neuroendocrine differentiation, overexpression of the sialyl-Lex antigen, overexpression of the peripheral benzodiazepine receptor (PBR), BAX protein expression and p53 mutational status. The predictive power of all markers in combination has not yet been evaluated.
  
  
  METHODS
  Between 1989 and 1991, 48 consecutive patients underwent surgery for stage III colorectal cancer at our hospital. All patients received a complete 5-year follow-up. Paraffin-embedded tumor samples were analyzed for all 5 markers. Multivariate discriminant analysis was performed to determine the prognostic value of all markers in combination.
  
  
  RESULTS
  Based on these prognostic markers a mathematical discriminant function was obtained. This function allowed to correctly predict the further course of disease in 77% of the patients (specificity: 83.3%, sensitivity: 70.8%). The discriminant function was confirmed in another group of 19 patients. Single marker analysis allowed the prediction of the further course of disease only in 58-70%.
  
  
  CONCLUSIONS
  Our study shows that in colorectal cancer, multimarker analysis is superior to unimarker analysis in predicting prognosis. The derived discriminant function allows patient stratification according to risk. Therefore, a multimarker analysis provides a rationale for future individualized risk-adapted therapies in stage III colorectal cancer.
authors.affiliation: Medical Clinic I, Gastroenterology, Infectious Diseases, Rheumatology, Charité--Campus Benjamin Franklin, Berlin, Germany.
authors.forename: Patricia
authors.initials: P
authors.lastname: Grabowski
authors.forename: Kerstin
authors.initials: K
authors.lastname: Maaser
authors.forename: Christoph
authors.initials: C
authors.lastname: Hanski
authors.forename: Harald
authors.initials: H
authors.lastname: Stein
authors.forename: Isrid
authors.initials: I
authors.lastname: Sturm
authors.forename: Werner
authors.initials: W
authors.lastname: Hopfenmüller
authors.forename: Bernd
authors.initials: B
authors.lastname: Dörken
authors.forename: Heinz-Johannes
authors.initials: HJ
authors.lastname: Buhr
authors.forename: Martin
authors.initials: M
authors.lastname: Zeitz
authors.forename: Hans
authors.initials: H
authors.lastname: Scherübl
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000097:blood*; D015331:Cohort Studies; D015179:Colorectal Neoplasms / Q000097:blood / Q000473:pathology* / Q000601:surgery*; D016002:Discriminant Analysis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011379:Prognosis
chemical_list: D014408:Biomarkers, Tumor