title: Predictive factors for local recurrence of resected colorectal lung metastases.
abstract: BACKGROUND
  Wedge resection or segmentectomy are the preferred treatments for pulmonary metastasis from colorectal cancer. However, local recurrence at the surgical margin is a problem with limited resections. This study attempted to identify predictive factors associated with local recurrences at the surgical margin after resection of pulmonary metastases.
  
  
  METHODS
  A total of 96 lesions in 61 patients who had undergone a pulmonary wedge resection or segmentectomy for the treatment of pulmonary metastasis from colorectal cancer were investigated. Various clinical and pathologic factors were reviewed, and the risk of a local recurrence at the surgical margin was investigated.
  
  
  RESULTS
  After pulmonary resection, 34 of the 61 patients (56%) experienced recurrences in their lungs. Local recurrences at the surgical margin were found in 17 patients (28%), even though 15 of these 17 cases had been histologically confirmed as completely resected cases. No clinical factors associated with local recurrence at the surgical margin were identified. Pathologically, lesions exhibiting 10 or more aerogenous spreads with floating cancer cell clusters around the main tumor (p = 0.02) and a malignant positive surgical margin (p = 0.04) had a significantly higher risk of local recurrence.
  
  
  CONCLUSIONS
  The present study indicated that local recurrence may occur even in cases with a pathologically negative surgical margin. In cases with pulmonary metastases from colorectal cancer, lesions with 10 or more aerogenous spreads with floating cancer cell clusters around the main lesion and a malignant positive surgical margin in the resected specimens have a significantly higher risk of local recurrence at the surgical margin than those without.
authors.affiliation: Pathology Division, National Cancer Center Research Institute East, Chiba, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Shiono
authors.forename: Genichiro
authors.initials: G
authors.lastname: Ishii
authors.forename: Kanji
authors.initials: K
authors.lastname: Nagai
authors.forename: Junji
authors.initials: J
authors.lastname: Yoshida
authors.forename: Mitsuyo
authors.initials: M
authors.lastname: Nishimura
authors.forename: Yukinori
authors.initials: Y
authors.lastname: Murata
authors.forename: Koji
authors.initials: K
authors.lastname: Tsuta
authors.forename: Young Hak
authors.initials: YH
authors.lastname: Kim
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nishiwaki
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Kodama
authors.forename: Motoki
authors.initials: M
authors.lastname: Iwasaki
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ochiai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000473:pathology*; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology / Q000556:secondary* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009364:Neoplasm Recurrence, Local / Q000473:pathology / Q000556:secondary* / Q000601:surgery*; D016016:Proportional Hazards Models; D012307:Risk Factors