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Proteomics Clin Appl. 2013 Jun;7(5-6):424-31. doi: 10.1002/prca.201200094. Epub 2013 May 17.

Serum fibrinogen alpha C-chain 5.9 kDa fragment as a biomarker for early detection of hepatic fibrosis related to hepatitis C virus.

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  • 1Clinical Proteomics Research Center, Chiba University Hospital, Chiba, Japan.



Clinical application of biomarker candidates discovered by proteomic analysis is challenging. The purpose of this study was to standardize preanalytical conditions for measurement of serum levels of fibrinogen alpha C-chain 5.9 kDa fragment (FIC 5.9) and to test the diagnostic value of this peptide for detection of early hepatic fibrosis in patients with hepatitis C virus (HCV)-related chronic hepatitis.


Serum FIC 5.9 levels were measured by a sandwich ELISA. Effects on the serum FIC 5.9 level of temperature, the time between venipuncture and serum separation, and the types of collection tubes used were examined. The diagnostic value of serum FIC 5.9 as an early indicator of hepatic fibrosis due to HCV was then assessed.


FIC 5.9 was produced in a time- and temperature-dependent manner after venipuncture. Abnormal FIC 5.9 values were found in 89.5% of FI stage patients. Receiver operating characteristic analyses confirmed the superiority of FIC 5.9 over other conventional markers for early detection of fibrosis.


The serum FIC 5.9 level may be an early indicator of hepatic fibrosis in HCV-related chronic liver diseases. This study provides an example of a pipeline from biomarker discovery by proteome analysis to assay optimization and preliminary clinical validation.

© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

[PubMed - indexed for MEDLINE]
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