title: The effect of tumor size on curability of stage I non-small cell lung cancers.
abstract: OBJECTIVE
  The objective of this study was to determine the relationship between tumor size and curability of stage I non-small cell lung cancer.
  
  
  METHODS
  From the Surveillance, Epidemiology, and End Results registry 2003, we identified all primary non-small cell lung cancer cases that were diagnosed prior to autopsy. Among these cases, we narrowed the focus to those diagnosed in 1988 or later, and to 7,620 patients who had undergone curative surgical resection. Kaplan-Meier survival curves were obtained for these stage I malignancies for five tumor size categories (ie, 5 to 15 mm, 16 to 25 mm, 26 to 35 mm, 36 to 45 mm, and > 45 mm). The 12-year Kaplan-Meier estimator of survival was used as a measure of lung cancer cure rate.
  
  
  RESULTS
  Among 7,620 stage I cancers, cure rates decreased with increasing tumor size. The 12-year survival rates for patients with tumors 5 to 15 mm in diameter was 69% (95% confidence interval [CI], 64 to 74%), 63% for those with tumors 16 to 25 mm in diameter (95% CI, 60 to 67%), 58% for those with tumors 26 to 35 mm in diameter (95% CI, 54 to 61%), 53% for those with tumors 36 to 45 mm in diameter (95% CI, 48 to 57%), and 43% for those with tumors > 45 mm in diameter (95% CI, 39 to 48%). Cure rates were statistically significantly different for all tumor size categories (p < 0.05) except for the groups with tumors 26 to 35 mm and 36 to 45 mm in diameter (p = 0.10).
  
  
  CONCLUSIONS
  Smaller tumor size at diagnosis is associated with improved curability within stage I non-small cell lung cancers. These results suggest that further subclassification by size within stage I may be important.
authors.affiliation: Department of Medicine, Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1087, New York, NY 10029, USA. juan.wisnivesky@mssm.edu
authors.forename: Juan P
authors.initials: JP
authors.lastname: Wisnivesky
authors.forename: David
authors.initials: D
authors.lastname: Yankelevitz
authors.forename: Claudia I
authors.initials: CI
authors.lastname: Henschke
mesh_terms: D002289:Carcinoma, Non-Small-Cell Lung / Q000175:diagnosis* / Q000401:mortality / Q000473:pathology / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D008168:Lung / Q000473:pathology; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000401:mortality / Q000473:pathology / Q000601:surgery; D009367:Neoplasm Staging / Q000145:classification / Q000401:mortality; D011013:Pneumonectomy; D011379:Prognosis; D018426:SEER Program; D016019:Survival Analysis; D014481:United States