Evaluation of noninvasive markers for the diagnosis of cystic fibrosis liver disease

Objectives: In cystic fibrosis (CF), liver disease (LD) is the third leading cause of mortality. As liver biopsy was considered inconsistent in CFLD diagnosis, a combination of modalities were utilized in the conventional Debray criteria (DC). More recently, noninvasive liver fibrosis biomarkers were applied by Koh et al (New criteria-NC). In the current study, we aimed to evaluate noninvasive biomarkers for the CFLD diagnosis. Methods: Longitudinal data were collected from a cohort of genetically confirmed CF patients. CFLD was diagnosed by both DC and NC. Apart from transient elastography (TE) > 6.8 kPa, biomarkers incorporated in the NC included AST/ALT-ratio (AAR) >= 1, FIB-4 index >= 3.25 and APRI >0.50. Results: 62 patients with CF, [56.5% male, age at enrollment 25 (22-31) years], were prospectively followed-up for 33 (28-36) months. Sixteen (25.8%) and 27 (43.5%) patients met DC and NC, respectively. Twenty-four fulfilling NC had at least one positive biomarker (6 TE, 7 AAR, 6 both TE and AAR, 2 both APRI and AAR and 3 both APRI and TE). Thirteen (48.1%) had diffuse LD/cirrhosis by the NC and all had at least one additional parameter classifying them as CFLD. From the 14 (51.8%) with no-diffuse-LD, 64.3%, 14.3% and 21.4% had 2, 3 and 4 of the necessary modalities incorporated in NC, respectively, confirming their classification as CFLD. TE was 100% specific to rule in CFLD but had a moderate sensitivity. Conclusions: NC were able to identify 17.7% more CFLD patients compared to DC. The multiple biomarkers incorporated in NC may enhance the ability to detect CFLD.