title: Radiofrequency ablation versus percutaneous microwave coagulation therapy for small hepatocellular carcinomas: a retrospective comparative study.
abstract: OBJECTIVE
  Although local ablation procedures are useful in eradication treatment for small hepatocellular carcinoma (HCC), there have only been a few clinical studies comparing the response to radiofrequency ablation (RFA) and percutaneous microwave coagulation therapy (PMCT). We evaluated the clinical effect and safety of these two procedures for the treatment of small HCCs measuring 2cm or less in diameter.
  
  
  METHODS
  Twenty-four patients with HCC who were treated by RFA and were compared with 39 patients with HCC who underwent PMCT. These procedures were repeated until complete tumor necrosis was achieved. The therapeutic and adverse effects were retrospectively compared between the two procedures.
  
  
  RESULTS
  (1) There were significantly fewer treatment sessions (P < 0.001) in the RFA group than the PMCT group, and the necrotic area was significantly larger (P < 0.001) in the former group. (2) The local recurrence rate was significantly lower (P = 0.012) after RFA than after PMCT, even though the ectopic recurrence rate showed no significant difference. 3) The cumulative survival rate was significantly higher (P = 0.028) in the RFA group. (4) The incidence of pain and fever after treatment was significantly higher after PMCT than after RFA. Bile duct injury and pleural effusion were also more frequent in the PMCT group.
  
  
  CONCLUSIONS
  RFA is more useful than PMCT in the treatment of small HCCs because it is minimally invasive and achieves a low local recurrence rate, high survival rate, and extensive necrosis after only a few treatment sessions.
authors.affiliation: Division of Hepatology, Department of Medicine, Kawasaki Medical School, Kurashiki, Japan. ohmotok@med.kawasaki-m.ac.jp
authors.forename: Kerji
authors.initials: K
authors.lastname: Ohmoto
authors.forename: Naoko
authors.initials: N
authors.lastname: Yoshioka
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Tomiyama
authors.forename: Norikuni
authors.initials: N
authors.lastname: Shibata
authors.forename: Tomoya
authors.initials: T
authors.lastname: Kawase
authors.forename: Koji
authors.initials: K
authors.lastname: Yoshida
authors.forename: Makoto
authors.initials: M
authors.lastname: Kuboki
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Yamamoto
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D006528:Carcinoma, Hepatocellular / Q000401:mortality / Q000628:therapy*; D017115:Catheter Ablation / Q000009:adverse effects / Q000379:methods*; D004564:Electrocoagulation / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000401:mortality / Q000628:therapy*; D008297:Male; D008872:Microwaves / Q000009:adverse effects; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000453:epidemiology; D012189:Retrospective Studies; D015996:Survival Rate; D016896:Treatment Outcome