# Non-invasive screening for liver fibrosis by acoustic radiation force impulse in patients with ciliopathies

## TL;DR

This study shows that ARFI ultrasound can effectively screen for liver fibrosis in patients with ciliopathies, a group of genetic disorders affecting cilia function.

## Contribution

The study introduces ARFI as a non-invasive, accurate screening method for liver fibrosis in ciliopathy patients.

## Key findings

- ARFI correctly identified liver fibrosis stages in all patients with histological confirmation.
- Elevated GGT levels and spleen size were associated with ARFI-defined liver fibrosis.
- Normal GGT levels reliably ruled out the most severe fibrosis stage (F4).

## Abstract

Primary cilia are antenna-like structures on the surface of epithelial cells involved in multiple signaling pathways. Their malfunction can cause a heterogenous group of diseases called ciliopathies with a broad spectrum of organ involvements, including liver fibrosis. The aim of this exploratory study was to evaluate elastography measurement via ultrasound based acoustic radiation force impulse imaging (ARFI) as a screening tool for liver fibrosis in ciliopathies. In a prospective cohort of 51 patients with ciliopathies (aged between 2 months and 66 years) from the NEOCYST registry stiffness of the right liver lobe and spleen was measured via ARFI and results were then compared with laboratory parameters, endoscopic, ultrasonographic and histological findings. ARFI screening of the liver identified 27 patients without increased liver stiffness suggesting no or insignificant fibrosis, 11 with intermediate fibrosis, and 12 with liver fibrosis F4. Four patients showed increased spleen stiffness in ARFI. In all 10 patients with histologically confirmed fibrosis, ARFI results perfectly matched fibrosis stages. In the ARFI-based overall fibrosis subgroup, ALT, AST, GGT and spleen size were significantly increased, whereas platelets were significantly decreased compared to the no fibrosis subgroup. Normal GGT excluded ARFI-defined F4 fibrosis (negative predictive value 100%). Gene variants in PKHD1, TMEM67, and TULP3 were primarily detected in our patients with liver fibrosis whereas NPHP1 and HNF1B were not associated with increased liver stiffness. ARFI is a valuable screening tool for the detection of liver involvement in ciliopathies and may be useful in addition to laboratory and clinical parameters alone.

Trial registration: NEOCYST registry DRKS00011003, registered 06.09.2016, https://drks.de/search/en/trial/DRKS00011003.