title: Prediction of lung adenocarcinoma without vessel invasion: a CT scan volumetric analysis.
abstract: OBJECTIVE
  Patients with lung adenocarcinoma without vessel invasion have a favorable prognosis after resection and are among the candidates for limited surgery. The purpose of the present study was to predict lung adenocarcinoma without vessel invasion based on a volumetric analysis of the lesion with a CT scan prior to the operation.
  
  
  METHODS
  CT scan images were obtained in 288 consecutive patients with adenocarcinoma of the lung before surgical resection. Total tumor volume, the volume of the nonsolid component, and the proportion occupied by the nonsolid component were calculated by the perimeter method. The performance of the derived logistic regression model and the volumetric results were evaluated by receiver operating characteristic analysis. The model derived for the prediction of tumors without vessel invasion was assessed by means of the leave-one-out cross-validation technique.
  
  
  RESULTS
  The pathologic diagnosis was adenocarcinoma with vessel invasion in 160 cases, and without vessel invasion in 128 cases. The median total tumor volume, the median volume of the nonsolid component, and median proportion occupied by the nonsolid component were 1,123.7 mm(3), 253.4 mm(3), and 58.0%, respectively. With the derivation of the predictive rule, stepwise regression yielded the following five features: the proportion occupied by the nonsolid component; spiculation; pleural indentation; gender; and tumor size. The Az value, a measure of diagnostic power represented as the area under the curve, was 0.957 for prediction of lung adenocarcinoma without vessel invasion. The cross-validation accuracy achieved by applying the rule was 90.3%.
  
  
  CONCLUSIONS
  The proportion occupied by the nonsolid component based on a CT scan volumetric analysis was a reliable predictor of tumors without vessel invasion in patients with adenocarcinoma of the lung.
authors.affiliation: Division of Diagnostic Radiology, National Cancer Center Hospital, Tokyo, Japan. utateish@ncc.go.jp
authors.forename: Ukihide
authors.initials: U
authors.lastname: Tateishi
authors.forename: Hajime
authors.initials: H
authors.lastname: Uno
authors.forename: Kan
authors.initials: K
authors.lastname: Yonemori
authors.forename: Mistuo
authors.initials: M
authors.lastname: Satake
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takeuchi
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Arai
mesh_terms: D000230:Adenocarcinoma / Q000000981:diagnostic imaging* / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D016015:Logistic Models; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D008875:Middle Aged; D011379:Prognosis; D012372:ROC Curve; D014057:Tomography, X-Ray Computed