Quantitative liver function tests improve the prediction of clinical outcomes in chronic hepatitis C: Results from the hepatitis C antiviral long-term treatment against cirrhosis trial

Everson GT et al. – Quantitative liver function tests (QLFTs) independently predict risk for future clinical outcomes. By improving risk assessment, QLFTs could enhance the noninvasive monitoring, counseling, and management of patients with chronic hepatitis C virus (HCV).

Methods

• Two hundred and twenty-seven participants in the Hepatitis C Antiviral Long-term Treatment Against Cirrhosis (HALT-C) Trial underwent baseline QLFTs and were followed for a median of 5.5 years for clinical outcomes.
• QLFTs were repeated in 196 patients at month 24 and in 165 patients at month 48.
• Caffeine elimination rate (kelim), antipyrine (AP) clearance (Cl), MEGX concentration, methionine breath test (MBT), galactose elimination capacity (GEC), dual cholate (CA) clearances and shunt, perfused hepatic mass (PHM), and liver and spleen volumes (by single-photon emission computed tomography) were measured.

Results

• Baseline QLFTs were significantly worse (P = 0.0017 to P < 0.0001) and spleen volumes were larger (P < 0.0001) in the 54 patients who subsequently experienced clinical outcomes.
• QLFT cutoffs that characterized patients as “low” and “high risk” for clinical outcome yielded hazard ratios ranging from 2.21 (95% confidence interval [CI]: 1.29-3.78) for GEC to 6.52 (95% CI: 3.63-11.71) for CA clearance after oral administration (Cloral).
• QLFTs independently predicted outcome in models with Ishak fibrosis score, platelet count, and standard laboratory tests.
• In serial studies, patients with high-risk results for CA Cloral or PHM had a nearly 15-fold increase in risk for clinical outcome.
• Less than 5% of patients with “low risk” QLFTs experienced a clinical outcome.

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