title: Comparative study of the Japan Integrated Stage (JIS) and modified JIS score as a predictor of survival after hepatectomy for hepatocellular carcinoma.
abstract: BACKGROUND
  The purpose of the study was to compare the abilities of the JIS and modified JIS (m-JIS) scores to predict survival after hepatectomy for hepatocellular carcinoma (HCC).
  
  
  METHODS
  Data for patients who underwent hepatectomy for HCC at Hiroshima University Hospital between 1986 and 2006 were included. The overall survival and disease-free survival were calculated by the Kaplan-Meier method, and differences between groups were tested by the log-rank test. The statistics of the Akaike information criterion (AIC) were used to show the more appropriate model.
  
  
  RESULTS
  A total of 626 patients were included (male/female, 468/158; mean age, 63.4+/-9.6 years; Child-Pugh class A/B, 524/102; liver damage grade A/B/C, 356/261/9). Mean survival and disease-free survival were 8.04+/-0.39 and 4.69+/-0.32 years, respectively. There was a significant difference in the overall survival rate between JIS scores 1 and 2, and 2 and 3 (P<0.05), but not between scores 0 and 1, or 3 and 4 (P>0.05). Except between m-JIS scores 0 and 1, there was excellent discriminatory ability in overall survival rate between other consecutive groups. Concerning disease-free survival, a significant difference was found only between JIS scores 1 and 2. However, the disease-free survival rate could be well differentiated between m-JIS scores 1 and 2, and 3 and 4. The m-JIS score had a higher discriminatory ability, indicated by a linear trend analysis, and a higher homogeneity likelihood ratio, and lower AIC statistics, than the original JIS score in predicting both overall and disease-free survival.
  
  
  CONCLUSIONS
  The modified-JIS scoring system using liver damage grade is better than the original JIS scoring system in predicting survival after hepatectomy for HCC in Japan.
authors.affiliation: Department of Surgery, Division of Frontier Medical Science, Programs for Biomedical Research, Graduate School of Biomedical Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan.
authors.forename: Kai-Zhong
authors.initials: KZ
authors.lastname: Luo
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Itamoto
authors.forename: Hironobu
authors.initials: H
authors.lastname: Amano
authors.forename: Akihiko
authors.initials: A
authors.lastname: Oshita
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Ushitora
authors.forename: Yoshisato
authors.initials: Y
authors.lastname: Tanimoto
authors.forename: Hideki
authors.initials: H
authors.lastname: Ohdan
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Tashiro
authors.forename: Toshimasa
authors.initials: T
authors.lastname: Asahara
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006528:Carcinoma, Hepatocellular / Q000401:mortality* / Q000473:pathology / Q000601:surgery; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006498:Hepatectomy / Q000379:methods*; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008113:Liver Neoplasms / Q000401:mortality* / Q000473:pathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging / Q000379:methods*; D011184:Postoperative Period; D011379:Prognosis; D012189:Retrospective Studies; D012720:Severity of Illness Index; D016019:Survival Analysis; D015996:Survival Rate / Q000639:trends