NON INVASIVE ASSESSMENT OF LIVER FIBROSIS : FIBROSCAN
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1 NON INVASIVE ASSESSMENT OF LIVER FIBROSIS : FIBROSCAN M. Beaugrand Service d Hépatologied Hopital J. Verdier BONDY et Université Paris XIII MAINZ
2 ASSESSMENT OF FIBROSIS : WHY? Management of individual patients Significant fibrosis Cirrhosis Treatment Screening for varices and HCC Screening for cirrhosis or extensive fibrosis In high risk patients In the general population Evaluation of treatments Antiviral and antifibrotic drugs
3 ELASTOMETRY (FIBROSCAN) LB x 100 Probe 2.5 cm Volume 1 cm 4 cm Sandrin et al. Ultrasound Med Biol 2003;29:1-8
4 HOW TO MEASURE ELASTICITY? Generate an elastic Shear vawe Measure its spead Vs Elasticity E V S 2
5 Volume of exploration > 3 cm 3 Probe position 2.5 cm Volume of exploration Probe 1 cm 4 cm
6 INTER OBSERVER REPRODUCTIBILITY OF LSM Fraquelli et al, Gut 2007
7 PATIENTS WITH HCV CHRONIC HEPATITIS 327 HCV + patients with no ascites 23 patients excluded: unreliable stiffness measurement: success rate less than 60% upon 10 measurements 53 patients excluded biopsy not suitable for fibrosis stage assessment: less than 10 portal tracts in the absence of cirrhosis 251 patients included Small biopsy 126 patients Large biopsy 125 patients
8 BOX PLOTS. N= Legend Stiffness (kpa) (logarithmic scale) Elasticity (kpa) maximum median minimum IQR F01 F2 F3 F4 Fibrosis stage Fibrosis stage (METAVIR)
9 ROC CURVES Sensibilité F01 / F234 F 2 F 3 F=4 F012 / F34 F0123 / F Specificité AUROC ( CONFIDENCE INTERVALS 95%) - F 2 2 : 0.79 ( ) 0.84) - F 3 3 : 0.91 ( ) 0.96) - F=4 : 0.97 ( )
10 UNI AND MULTIVARIATE ANALYSIS Univariate analysis (Kendall s s coefficient) Fibrosis Activity Steatosis Stiffness r p < Fibrosis r p - < Multivariate analysis (multiple regression) Only fibrosis was significantly correlated to liver stiffness measurement.
11 VALIDATION OF DIAGNOSIS ACCURACY IN AN INDEPENDENT HCV POPULATION Total number of included patients: 639 Number of unreliable liver samples: 86 (13%) Number of unreliable LSM: 59 (9%) Patients kept for statistical analysis : 494 METAVIR Steatosis F % A % S % Sensitivity Area under ROC curves (95% confidence interval) F01 versus F234 = 0.84 ( ) F012 versus F34 = 0.93 ( ) F0123 versus F4 = 0.96 ( ) F01 versus F234 F012 versus F34 Univariate Spearman correlation METAVIR F: 0.70 (p << 0.001) METAVIR A: 0.45 (p << 0.001) Steatosis: 0.35 (p << 0.001) F0123 versus F Specificity
12 LIVER BIOPSIES > 30 mm Patients Causes : - Results 71 VHC 14 VHB 15 VHC+HIV 2 VHB+HIV 1 VHC+VHB Fibrosis Score : F0 F1 F2 F3 F4 N F2 F3 = F4 AUROC
13 CUT-OFF VALUES * The optimum thresholds were chosen to maximize the sum of sensitivity and specificity. Threshold (kpa) F Sensitivity Specificity LR F F = * Obtained by the jack-knife knife method.
14 FIBROSCAN IN HBV PATIENTS 202 patients - 15 non interpretable biopsies - 14 LSM considered as non reliable Statistical analysis on 173 patients AUROC F01 versus F234: 0.81 ( ) F012 versus F34: 0.93 ( ) F0.123 versus F4: 0.93 ( ) Sensitivity F01 versus F234 F0123 versus F34 F0123 versus F Specificity
15 FIBROSCAN VERSUS BLOOD TESTS FibroScan FibroTest APRI Elasticité (kpa) F1 F2 F3 F4 Fibrosis stage 0.0 F1 F2 F3 F4 Fibrosis stage 0.0 F1 F2 F3 F4 Fibrosis stage Score METAVIR de fibrose Score METAVIR de fibrose Score METAVIR de fibrose Castera Al. Gastroenterology 2005
16 CONCORDANCE WITH LIVER BIOPSY AUROC F01/F234 F012/F34 F0123/F4 APRI FibroTest FibroScan Combinaison FibroTest+FibroScan Percentage of concording results F01/F234 F0123/F4 FibroTest FibroScan Combinaison FibroTest+FibroScan
17 FIBROSCAN / BLOOD TESTS Physical parameter directly linked fo fibrosis Many biological parameters not directly related to fibrosis and prone to the influence of extra hepatic conditions One single device Dozens of predictive tests
18 FIBROSIS FIBROSIS STAGE
19 Acute HDV hepatitis Sarcoïdosis Alcoholic cirrhosis Normal liver
20 Chronic hepatitis rho=0.50; p< Cirrhosis rho=0.43; p= Liver stiffness (kpa) Steatohepatitis rho=0.22; p=0.16 All patients rho=0.60; p< Fibrosis fraction area (%) Figure 2
21 SCREENING IN HIGH RISK PATIENTS LSM 227 patients in alcoholic abstinence program LSM>13 kpa yes Suspected cirrhosis 41 Blood tests no LB 34 Absence of cirrhosis Confirmation of cirrhosis 33
22 CONCLUSION 1) In patients with chronic live disease LSM reflects the arrount of liver fibrosis. 2) It has particularly good performances for the diagnosis of cirrhosis 3) Fibroscan might be a reliable screening tool for the diagnosis of cirrhosis in high risk groups or even in the general population.
23 FUTURE Improvements to come Improvement in software New probes for obese patients and also for children (or patients with small intercostal spaces Future developments 1 D measurements 2 D imaging
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