title: Liver metastases from gastric cancer represent systemic disease in comparison with those from colorectal cancer.
abstract: BACKGROUND
  The aim of this retrospective study was to clarify the difference in behavior and outcome after initial hepatectomy between gastric cancer liver metastases (GCLM) and colorectal cancer liver metastases (CCLM).
  
  
  METHODS
  Data for patients undergoing curative hepatectomy for liver-only metastases from colorectal cancer (n = 193) and gastric cancer (n = 26) performed at single institution with the same criteria regarding the status of liver metastases were reviewed. Post-hepatectomy recurrence pattern, re-resection for recurrence, and three different endpoints were evaluated.
  
  
  RESULTS
  There was no significant difference between the GCLM and the CCLM in the incidence of recurrence (69% vs. 63%, P = 0.553) and recurrence-free survival (median, 15.2 months vs. 16.5 months, P = 0.230) following initial hepatectomy for liver metastases. However, the GCLM had a higher frequency of systemic unresectable recurrences than the CCLM. Time to surgical failure (median, 15.2 months vs. 39.7 months, P = 0.006) and overall survival (median, 20.1 months vs. 66.2 months, P < 0.001) were significantly shorter in the GCLM than in the CCLM.
  
  
  CONCLUSIONS
  GCLM shows more systemic and aggressive oncological behavior than CCLM after curative hepatectomy even when metastases are confined only to the liver at the time of initial hepatectomy.
authors.affiliation: Department of Hepatobiliary-Pancreatic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan. s-ooguro@juntendo.ac.jp.
authors.forename: Seiji
authors.initials: S
authors.lastname: Oguro
authors.affiliation: Department of Hepatobiliary-Pancreatic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Imamura
authors.affiliation: Department of Hepatobiliary-Pancreatic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: Jiro
authors.initials: J
authors.lastname: Yoshimoto
authors.affiliation: Department of Hepatobiliary-Pancreatic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ishizaki
authors.affiliation: Department of Hepatobiliary-Pancreatic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Kawasaki
mesh_terms: D000328:Adult; D000368:Aged; D015331:Cohort Studies; D015179:Colorectal Neoplasms / Q000401:mortality / Q000473:pathology* / Q000601:surgery; D018572:Disease-Free Survival; D005260:Female; D006498:Hepatectomy / Q000379:methods / Q000401:mortality; D006785:Hospitals, University; D006801:Humans; D053208:Kaplan-Meier Estimate; D008113:Liver Neoplasms / Q000401:mortality* / Q000556:secondary* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000473:pathology; D009364:Neoplasm Recurrence, Local / Q000453:epidemiology* / Q000473:pathology / Q000601:surgery; D009367:Neoplasm Staging; D011379:Prognosis; D016016:Proportional Hazards Models; D012086:Reoperation / Q000379:methods / Q000401:mortality; D012189:Retrospective Studies; D018570:Risk Assessment; D018709:Statistics, Nonparametric; D013274:Stomach Neoplasms / Q000401:mortality / Q000473:pathology* / Q000601:surgery; D015996:Survival Rate
keywords: Colorectal neoplasms; Liver neoplasms; Neoplasm metastasis; Stomach neoplasms; Survival analysis