Serum cytokeratin-18 fragment levels as noninvasive marker of nonalcoholic steatohepatitis in the chilean population. / Fragmento sérico de citoqueratina-18 como marcador no invasivo de esteatohepatitis no alcohólica en población chilena.
Gastroenterol Hepatol
; 40(6): 388-394, 2017.
Article
in En, Es
| MEDLINE
| ID: mdl-28359548
Nonalcoholic steatohepatitis (NASH) is the most aggressive form of nonalcoholic fatty liver disease (NAFLD) and involves the risk of progression to more advanced stages of liver disease. Non-invasive methods are needed to identify patients with NASH. OBJECTIVE: To evaluate the diagnostic performance of the determination of serum levels of cytokeratin-18 (CK-18) as a non-invasive marker of NASH in the Chilean population. METHODS: Serum CK-18 levels were determined in a group of 41 patients with biopsy-proven NAFLD. NASH diagnosis was based on Brunt's criteria (histological parameters and ballooning), and the NAFLD activity score (NAS) and the presence of fibrosis were determined. The correlation between the NAFLD activity score (NAS) and CK-18 was evaluated with Spearman's rank correlation coefficient. A ROC curve was produced to assess the diagnostic value of CK-18 for NASH. The NAFLD fibrosis score (NFS) (to predict fibrosis and NASH) was compared to CK-18 with simple linear regression. Data were expressed in median [25th-75th percentile] and evaluated with the Wilcoxon rank test. RESULTS: The mean age of the study group (23% male) was 50.4±11.1 years. 34.2% were diagnosed with NASH (NAS≥5). CK-18 levels were significantly higher in patients with NASH versus those without NASH (183.6 IU/l [97.4 to 734.4] vs. 117.2 IU/l [83.8 to 954.8], p= 0.016). CK-18 levels were a good predictor of NASH on biopsy with an area under the curve (AUC) of 0.732 (95% CI, 0.572 to 0.897). A CK-18 cut-off of 130.5 IU/l had a sensitivity of 92.9%, specificity of 63%, positive predictive value of 56.5% and negative predictive value of 94.4%, and was able to correctly classify 73.2% of patients with NASH. NFS identified advanced liver fibrosis (AUC 0.739, 95% CI, 0.56-0.91), but was of limited value to identify NASH (AUC 0.413, 95% CI, 0.21-0.61). CONCLUSION: CK-18 is a good non-invasive marker for NASH. Although NFS was found to be an accurate marker of advanced liver fibrosis, it was not of value to identify NASH. In patients with NAFLD, CK-18 and NFS could be useful in predicting NASH and liver fibrosis, respectively.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Keratin-18
/
Non-alcoholic Fatty Liver Disease
Type of study:
Diagnostic_studies
/
Etiology_studies
/
Prognostic_studies
Limits:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Country/Region as subject:
America do sul
/
Chile
Language:
En
/
Es
Journal:
Gastroenterol Hepatol
Year:
2017
Document type:
Article
Affiliation country:
Chile
Country of publication:
Spain