title: Prognostic factors in 3315 completely resected cases of clinical stage I non-small cell lung cancer in Japan.
abstract: BACKGROUND
  The objective of this retrospective study was to identify prognostic factors in completely resected clinical (c-) stage I non-small cell lung cancer cases.
  
  
  METHODS
  In 2001, the Japanese Joint Committee of Lung Cancer Registry collected data on the outcome and clinicopathological profiles of 7408 patients who had undergone resection for primary lung cancer in 1994. They included 3315 c-stage I patients who underwent complete resection, and in this study attempted to identify prognostic factors in the c-stage IA and c-stage IB cases.
  
  
  RESULTS
  The overall 5-year survival rate was 66.5%: 74.7% in the 2085 c-stage IA cases and 52.5% in the 1230 c-stage IB cases. The survival curve of the c-stage IA cases was higher than that of the c-stage IB cases. Multivariate analysis of the c-stage IA cases revealed six factors that predicted a significantly better outcome: age, gender, pathological (p-) T status, p-N status, nodal dissection, and tumor diameter (< or =2 cm), and the same analysis of the c-stage IB cases revealed six factors: age, gender, p-T status, p-N status, operative procedure, and tumor diameter (<5 cm). The c-stage IA patients whose tumor diameter was 2 cm or less had a higher survival rate than the patients whose tumor diameter was more than 2 cm, and the c-stage IB patients whose tumor diameter was less than 5 cm had a higher survival rate than the patients whose tumor diameter was 5 cm or more.
  
  
  CONCLUSIONS
  Tumor size is an independent prognostic factor for postoperative survival in c-stage I patients.
authors.affiliation: Division of Chest Surgery, The Japanese Joint Committee of Lung Cancer Registration, Niigata Cancer Center Hospital, Kawagishi-cho, Niigata, Japan. koike@niigata-cc.jp
authors.forename: Teruaki
authors.initials: T
authors.lastname: Koike
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Tsuchiya
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Goya
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Sohara
authors.forename: Etsuo
authors.initials: E
authors.lastname: Miyaoka
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000401:mortality / Q000601:surgery*; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008175:Lung Neoplasms / Q000401:mortality / Q000601:surgery*; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D016016:Proportional Hazards Models; D012042:Registries; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate