title: Spread of malignant cells in the surgical margin with stapled excision of lung cancer: comparison of aggressive clump and less traumatic jaw closure type staplers.
abstract: BACKGROUND
  During stapled excision of lung cancer tissue, malignant cells can spread in the surgical margin. Stapling methods can be classified as aggressive clumping (AC) and less traumatic jaw closing (LTJC) types, thus the ratio of malignant margins may differ between stapler types.
  
  
  METHODS
  The malignant status of the stapled margin was retrospectively investigated in 112 cases using a cytology technique. Stapler type, maximum tumor diameter, distance from surgical margin, thoracotomy type, and tumor location were used as variables. In addition, clinical results of excision cases were assessed.
  
  
  RESULTS
  The ratio of malignant margins was 22/54 (41 %) in the AC group and 11/58 (19 %) in the LTJC group ( P = 0.01). Multivariate analysis revealed that the stapling method and tumor location were an independently significant factor. Surgical margin recurrence occurred only in 4 (57 %) of 7 cases with malignant margin.
  
  
  CONCLUSIONS
  The AC type method showed a greater potential to spread malignant cells, thus there seems to be a higher possibility of regional relapse with that technique.
authors.affiliation: Division of General Thoracic Surgery, Department of Surgery E-1, Osaka University, Graduate School of Medicine, Suita, Osaka, Japan. sawabata@surg1.med.osaka-u.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Sawabata
authors.forename: S-I
authors.initials: SI
authors.lastname: Takeda
authors.forename: M
authors.initials: M
authors.lastname: Inoue
authors.forename: T
authors.initials: T
authors.lastname: Tokunaga
authors.forename: M
authors.initials: M
authors.lastname: Koma
authors.forename: H
authors.initials: H
authors.lastname: Maeda
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D016015:Logistic Models; D008175:Lung Neoplasms / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009364:Neoplasm Recurrence, Local / Q000517:prevention & control*; D009366:Neoplasm Seeding; D012189:Retrospective Studies; D017792:Surgical Stapling / Q000379:methods*