title: A comparison of the risk factors of intrahepatic recurrence, early recurrencen, and multiple recurrences after resection for single nodular hepatocellular carcinoma.
abstract: OBJECTIVE
  Intrahepatic recurrence is one of the most important causes of compromised prognosis after surgical resection of hepatocellular carcinoma (HCC). This retrospective study was designed to identify and compare the risks of recurrence, early recurrence and multiple recurrences in a single patient population.
  
  
  METHODS
  A series of 92 consecutive patients, who received resection for single nodular HCC at our institute from January 2007 to December 2013, were enrolled in this study. The patients were divided into recurrent and non-recurrent groups; the recurrent group was further divided into subgroups by applying two criteria: early and late recurrence (with a cutoff of 18 months), and single and multiple (≥2) recurrence. The potential risk factors were compared using univariate and multivariate analyses. The subgroup analysis was performed to determine the effects of different cut-off values on the analysis.
  
  
  RESULTS
  41 recurrences (44.6%) occurred during a mean follow-up of 42.4 months. The Child-Pugh score, and the portal vein invasion were found to be independent risk factors of recurrence, but differentiation was the only independent risk factor of early recurrence. The serum alpha-fetoprotein, tumor size, tumor necrosis, and hemorrhage were found to be the risk factors of multiple recurrences according to the univariate analysis, but lacked significance according to the multivariate analysis. When the cutoffs for early and multiple recurrences were changed to ≤10 months and >3 nodules, respectively, different risk factors were identified.
  
  
  CONCLUSIONS
  Our results implicated that different factors can predict the recurrence, timing, and multiplicity of an HCC recurrence. Further studies should be conducted to prove the complex relationships between tumor burden, invasiveness, and underlying liver cirrhosis for initial tumors, and the timing and multiplicity of recurrent HCC.
authors.affiliation: Department of Surgery, Inha University School of Medicine, Incheon, Korea.
authors.forename: Hyun Joon
authors.initials: HJ
authors.lastname: An
authors.affiliation: Department of Surgery, Inha University School of Medicine, Incheon, Korea.
authors.forename: Woo Young
authors.initials: WY
authors.lastname: Shin
authors.affiliation: Department of Surgery, Inha University School of Medicine, Incheon, Korea.
authors.forename: Keon-Young
authors.initials: KY
authors.lastname: Lee
authors.affiliation: Department of Surgery, Inha University School of Medicine, Incheon, Korea.
authors.forename: Seung-Ik
authors.initials: SI
authors.lastname: Ahn
keywords: Hepatocellular carcinoma; Recurrence pattern; Resection; Risk factors