title: The prognostic impact of tumor volume on stage I non-small cell lung cancer.
abstract: The purpose of this study was to investigate the prognostic impact of tumor volume (TV) on patients with stage I non-small cell lung cancer (NSCLC) after complete resection.
  
  
  
  We retrospectively reviewed the clinicopathological characteristics of 274 patients with stage I NSCLC who had received preoperative chest computed tomography (CT) scans and complete resection. TV was semi-automatically measured from chest CT scans by using an imaging software program. The optimal cutoff values of TV were determined by X-tile software. Disease-free survival (DFS) and overall survival (OS) were compared using Kaplan-Meier analysis. Univariate and multivariate analyses were performed to identify risk factors for DFS and OS.
  
  
  
  By using 3.046cm3and 8.078cm3as two optimal cutoff values of TV, the patients were separated into three groups. The 5-year DFS and OS for patients with TV≤3.046cm3, 3.046-8.078cm3, and>8.078cm3were 88.0%, 73.6%, and 62.1%, respectively (P<0.001), and 91.4%, 84.5%, and 73.3%, respectively (p<0.001). Multivariate analysis showed that age and TV were independent factors associated with DFS. Sex, age, histology, visceral pleural invasion, and TV were independent factors associated with OS. Stage Ia patients might be separated into three groups on the basis of TV with significantly different DFS and OS. Patients with tumor diameter≤2cm and 2-3cm were also stratified into two groups with significantly different DFS and OS on the basis of TV, respectively.
  
  
  
  TV is an independent risk factor for DFS and OS for stage I NSCLC after complete resection. TV might provide additional prognostic information over tumor diameter in patients with stage I NSCLC.
authors.affiliation: Department of Thoracic Surgery, Sun Yat Sen University Cancer Center, China; State Key Laboratory of Oncology in Southern China and Collaborative Innovation Center for Cancer Medicine, Guangzhou, China; Lung Cancer Institute, Sun Yat Sen University, Guangzhou, China. Electronic address: suxd@sysucc.org.cn.
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Su
authors.affiliation: Department of Thoracic Surgery, Sun Yat Sen University Cancer Center, China; State Key Laboratory of Oncology in Southern China and Collaborative Innovation Center for Cancer Medicine, Guangzhou, China; Lung Cancer Institute, Sun Yat Sen University, Guangzhou, China.
authors.forename: Hao-Jun
authors.initials: HJ
authors.lastname: Xie
authors.affiliation: Department of Thoracic Surgery, Sun Yat Sen University Cancer Center, China; State Key Laboratory of Oncology in Southern China and Collaborative Innovation Center for Cancer Medicine, Guangzhou, China; Lung Cancer Institute, Sun Yat Sen University, Guangzhou, China.
authors.forename: Qian-Wen
authors.initials: QW
authors.lastname: Liu
authors.affiliation: Department of Radiology, Sun Yat Sen University Cancer Center, Guangzhou, China; State Key Laboratory of Oncology in Southern China and Collaborative Innovation Center for Cancer Medicine, Guangzhou, China.
authors.forename: Yun-Xian
authors.initials: YX
authors.lastname: Mo
authors.affiliation: Department of Thoracic Surgery, Sun Yat Sen University Cancer Center, China; State Key Laboratory of Oncology in Southern China and Collaborative Innovation Center for Cancer Medicine, Guangzhou, China; Lung Cancer Institute, Sun Yat Sen University, Guangzhou, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Long
authors.affiliation: Department of Thoracic Surgery, Sun Yat Sen University Cancer Center, China; State Key Laboratory of Oncology in Southern China and Collaborative Innovation Center for Cancer Medicine, Guangzhou, China; Lung Cancer Institute, Sun Yat Sen University, Guangzhou, China.
authors.forename: Tie-Hua
authors.initials: TH
authors.lastname: Rong
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery / Q000628:therapy; D017024:Chemotherapy, Adjuvant; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery / Q000628:therapy; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D016019:Survival Analysis; D014057:Tomography, X-Ray Computed / Q000379:methods; D047368:Tumor Burden
keywords: Non-small cell lung cancer; Prognosis; Stage I; Surgery; Tumor volume