title: Heterogeneity of prognostic profiles in non-small cell lung cancer: too many variables but a few relevant.
abstract: OBJECTIVE
  Many prognostic factors, exceeding 150, for non-small cell lung cancer (NSCLC) are mentioned in the literature. The different statistical weight of the some variables at issue, their heterogeneity and their clinical uselessness is reviewed.
  
  
  METHODS
  Survival analysis of a cohort of NSCLC operated (n = 1730, 1993-1997) was carried out utilizing different statistical approaches: Cox proportional hazard analysis (CPHA), logistic regression (LRA), and recursive partitioning (CART).
  
  
  RESULTS
  CPHA identified 13 prognostic variables and 11 LRA. Of the 17 possible variables, 10 are coincident. CART provided five different diagnostic groups but only three differentiated survival levels. Parsimonious models were constructed including only T and N cancer staging variables. Areas under the ROC curve of 0.68 and 0.68 were found for CPHA and LGA parsimonious models respectively, and 0.72 and 0.71 for complete models.
  
  
  CONCLUSIONS
  Variables with a minimal impact on the respective models and thus with little or scarce predictive clinical repercussion were identified. Differences in the prognostic profile of survival can be caused by the different methodological approaches used. No relevant differences were found between the parsimonious and complete models. Although the amount of information managed is considerable, there continues to be a large predictive gap yet to be explained.
authors.affiliation: Unidad de Investigación-Epidemiologia Clínica, Hospital 12 de Octubre, Avda. Cordoba s/n., 28041, Madrid, Spain. acamara@h12o.es
authors.forename: Agustín
authors.initials: A
authors.lastname: Gomez de la Cámara
authors.forename: Angel
authors.initials: A
authors.lastname: López-Encuentra
authors.forename: Paloma
authors.initials: P
authors.lastname: Ferrando
mesh_terms: D002289:Carcinoma, Non-Small-Cell Lung / Q000175:diagnosis* / Q000453:epidemiology*; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000453:epidemiology*; D008297:Male; D011379:Prognosis; D012307:Risk Factors; D016019:Survival Analysis