title: [Significance and prognostic factors in 84 patients with colorectal liver metastases treated with radiofrequency ablation].
abstract: OBJECTIVE
  To investigate the prognostic factors and significance of patients with colorectal liver metastases (CLM) treated with radiofrequency ablation (RFA).
  
  
  METHODS
  A retrospective study was conducted for the clinic outcomes, follow-up data and survival status in 84 patients with CLM undergoing RFA between January 2000 and December 2008. Univariate and multivariate analyses were performed by log-rank test and Cox's proportional hazard model respectively.
  
  
  RESULTS
  A total of 265 lesions in 84 patients received RFA with a follow-up of 1-10 years. The median survival was 29 months, 1-year survival rate 98%, 3-year survival rate 27% and 5-year survival rate 7%. For those lesion < or = 4 cm and lesion number < 3, the median survival time was 30 months, 1-year survival rate 100%, 3-year survival rate 31% and 5-year survival rate 16%. For those with lesions > 4 cm or lesion number > 3, the median survival time was 28 months, 1-year survival rate 96%, 3-year survival rate 21% and 5-year survival rate 0. For those receiving RFA combined with chemotherapy, the median survival time was 32 months, three-year survival rate 29% and five-year survival rate 8%. For those on molecular-target therapy, the median survival time was 41 months, 3-year survival rate 60% and 5-year survival rate 20%. The multivariate statistical analysis showed that the influences of lesion number and size (P = 0.004), chemotherapeutic agents and timing (P = 0.004) and extra-liver metastases (P = 0.097) had statistic significance to the survival rate.
  
  
  CONCLUSIONS
  RFA has a favorable outcome in the treatment of CLM patients. The prognostic factors of overall survival are correlated with the lesion size and presence or absence of extra-hepatic metastasis. It may effectively improve the patient prognosis by RFA in combination with chemotherapy and especially molecular-target therapy.
authors.affiliation: State Key Laboratory of Oncology in Southern China, Minimally Invasive & Interventional Department, Sun Yat-sen University Cancer Center, Guangzhou 510060, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao
authors.forename: Jian-Peng
authors.initials: JP
authors.lastname: Wang
authors.forename: Pei-Hong
authors.initials: PH
authors.lastname: Wu
authors.forename: Zi-Lin
authors.initials: ZL
authors.lastname: Huang
authors.forename: Wang
authors.initials: W
authors.lastname: Li
authors.forename: Chuan-Xing
authors.initials: CX
authors.lastname: Li
authors.forename: Yong
authors.initials: Y
authors.lastname: Jiang
authors.forename: Chang-Chuan
authors.initials: CC
authors.lastname: Pang
authors.forename: Yu-Hong
authors.initials: YH
authors.lastname: Li
authors.forename: Li-Ren
authors.initials: LR
authors.lastname: Li
authors.forename: Zhi-Zhong
authors.initials: ZZ
authors.lastname: Pan
authors.forename: De-Sen
authors.initials: DS
authors.lastname: Wan
authors.forename: Rui-Hua
authors.initials: RH
authors.lastname: Xu
mesh_terms: D017115:Catheter Ablation; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery*; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis / Q000556:secondary / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D011379:Prognosis; D012189:Retrospective Studies; D015996:Survival Rate; D016896:Treatment Outcome