title: Noninvasive estimation of liver fibrosis and response to interferon therapy by a serum fibrogenesis marker, YKL-40, in patients with HCV-associated liver disease.
abstract: OBJECTIVE
  To evaluate the clinical utility of serum fibrosis markers, including YKL-40, in patients with HCV-associated liver disease.
  
  
  METHODS
  A total of 109 patients with HCV-associated liver disease were enrolled. We measured serum type IV collagen, amino-terminal peptide of type III procollagen (PIIIP), hyaluronic acid (HA), YKL-40 levels and biochemical. Parameters by RIA or ELISA. Eighty-eight patients underwent liver biopsy, and 67 of 109 patients received interferon (IFN) therapy. We also investigated the relationship between the concentrations of serum fibrosis markers and histological fibrosis scores (METAVIR), and evaluated the changes of the levels of fibrosis markers before and after the IFN therapy.
  
  
  RESULTS
  The increase in serum levels of all markers, particularly HA, was correlated with the progression of liver fibrosis (for type IV collagen, F = 9.076, P<0.0001; for PIIIP, F = 9.636, P<0.0001; for HA, F = 13.128, P<0.0001; and for YKL-40, F = 8.016, P<0.0001). YKL-40 had strong correlation with HA (r = 0.536, P<0.0001). Based on the receiver operating curve (ROC), the ability of serum HA exceeded the abilities of other serum markers to determine fibrosis score 4 from fibrosis score 0-3 (AUC = 0.854). While YKL-40 was superior to other fibrosis markers for predicting severe fibrosis (F2-F4) from mild fibrosis (F0-F1) (YKL-40, AUC = 0.809; HA, AUC = 0.805). After IFN therapy, only YKL-40 values significantly decreased not only in the responder group, but also in the nonresponder group (P = 0.03).
  
  
  CONCLUSIONS
  YKL-40 may be a useful non-invasive serum marker to estimate the degree of liver fibrosis and to evaluate the efficacy of IFN therapies in patients with HCV-associated liver disease.
authors.affiliation: First Department of Internal Medicine, Mie University School of Medicine, Tsu, Mie 514-8507, Japan.
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Saitou
authors.forename: Katsuya
authors.initials: K
authors.lastname: Shiraki
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yamanaka
authors.forename: Yumi
authors.initials: Y
authors.lastname: Yamaguchi
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Kawakita
authors.forename: Norihiko
authors.initials: N
authors.lastname: Yamamoto
authors.forename: Kazushi
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Kazumoto
authors.initials: K
authors.lastname: Murata
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakano
mesh_terms: D054392:Adipokines; D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000627:therapeutic use*; D015415:Biomarkers; D001706:Biopsy; D000071451:Chitinase-3-Like Protein 1; D005260:Female; D006023:Glycoproteins / Q000097:blood*; D019698:Hepatitis C, Chronic / Q000097:blood / Q000188:drug therapy* / Q000473:pathology; D006801:Humans; D007372:Interferons / Q000627:therapeutic use*; D037102:Lectins; D008103:Liver Cirrhosis / Q000097:blood / Q000188:drug therapy* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index
chemical_list: D054392:Adipokines; D000998:Antiviral Agents; D015415:Biomarkers; C084533:CHI3L1 protein, human; D000071451:Chitinase-3-Like Protein 1; D006023:Glycoproteins; D037102:Lectins; D007372:Interferons