title: Computed tomography (CT) predicts accurately the pathologic tumour size in stage I non-small-cell lung cancer (NSCLC).
abstract: BACKGROUND
  In stage I non-small-cell lung cancer (NSCLC) tumour size has been the most consistent determinant of survival. The choice of therapy option is based on accurate definition of the stage. The aim of our study is to correlate tumour size by computed tomography scan (CT) with pathologic size and to determine possible prognostic factors in surgically resected pathologic stage IA and IB NSCLC patients.
  
  
  METHODS
  Retrospective review of CT scans and medical history data from 89 pathologic stage I NSCLC patients. Clinical prognostic factors analysed were age, gender, smoking status, pulmonary function, performance status (PS), surgical procedure, histopathology, vessel invasion, pleural infi ltration, tumour size and number of lymph nodes resected. According to the new TNM classification for lung cancer, tumour size was divided into five groups (I: <2 cm, II: 2-3 cm, III: 3-5 cm, IV: 5-7 cm and V: >7 cm).
  
  
  RESULTS
  After a median surveillance of 55.2 months, 42 patients relapsed and 55 had died. The 5-year progressionfree survival was 55.7% and 5-year overall survival (OS) 49.9% (median 58.97 months). None of the clinical parameters analysed were predictors of OS. Significant correlation was found between tumour size in CT scan and pathologic stage (Pearson 0.75).
  
  
  CONCLUSIONS
  In our analysis with 89 surgically resected stage IA and IB NSCLC patients we found a good correlation between clinical and pathologic tumour size by CT scan. The prognoses factors analysed had no significant impact on survival.
authors.affiliation: Medical Oncology Service, Vall d'Hebron University Hospital, Barcelona, Spain. susanacedres@yahoo.es
authors.forename: Susana
authors.initials: S
authors.lastname: Cedrés
authors.forename: Isela
authors.initials: I
authors.lastname: Quispe
authors.forename: Pablo
authors.initials: P
authors.lastname: Martínez
authors.forename: Marina
authors.initials: M
authors.lastname: Longo
authors.forename: Eva
authors.initials: E
authors.lastname: Rodríguez
authors.forename: César
authors.initials: C
authors.lastname: Serrano
authors.forename: Eva
authors.initials: E
authors.lastname: Muñoz
authors.forename: Esther
authors.initials: E
authors.lastname: Pallisa
authors.forename: Enriqueta
authors.initials: E
authors.lastname: Felip
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D008168:Lung / Q000473:pathology; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008198:Lymph Nodes / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D012189:Retrospective Studies; D016019:Survival Analysis; D014057:Tomography, X-Ray Computed