Variability of noninvasive MRI and biological markers in compensated cirrhosis: insights for assessing disease progression.

Background: We annually monitored stable compensated cirrhosis (CC) patients to evaluate serial variation in blood serum, liver stiffness, and multiparametric magnetic resonance imaging (mpMRI) measures to provide reference change values (RCV) and sample size measures for future studies.

Methods: Patients were recruited from a prospectively followed CC cohort, with assessments at baseline and annually over three years. We report on blood markers, transient elastography liver stiffness measures (LSM) and noninvasive mpMRI (volume, T1 mapping, blood flow, perfusion) of the liver, spleen, kidneys, and heart in a stable CC group and a healthy volunteer (HV) group. Coefficient of variation over time (CoV) and RCV are reported, along with hazard ratio to assess disease progression. Sample size estimates to power future trials of cirrhosis regression on mpMRI are presented.

Results: Of 60 CC patients enrolled, 28 with stable CC were followed longitudinally and compared to 10 HVs. CoV in mpMRI measures was comparable between CC and HV groups. CoV of Enhanced Liver Fibrosis score was low (< 5%) compared to Fibrosis-4 index (17.9%) and Aspartate Aminotransferase-to-Platelet-Ratio Index (19.4%). A large CoV (20.7%) and RCV (48.3%) were observed for LSM. CoV and RCV were low for liver, spleen, and renal T1 values (CoV < 5%, RCV < 8%) and volume (CoV < 10%, RCV < 16%); haemodynamic measures were high (CoV 12-25%, RCV 16-47%).

Conclusions: Evidence of low CoV and RCV in multiorgan T1 values. RCV and sample size estimates are provided for future longitudinal multiorgan monitoring in CC patients.

Trial Registration: ClinicalTrials.gov identifier: NCT02037867 , Registered: 05/01/2013.