Intestinal Failure-associated Liver Disease

The goal of this observational (diagnostic validation) study is to validate imaging-based biomarkers for assessing liver involvement in pediatric patients with established or suspected liver disease. The projekt involves 3 larger studies, each with specific aims specified in detailed description below. The main study (study 1) compares imaging-based biomarkers-with liver biopsy to evaluate their correlation with histologically confirmed liver disease, including fibrosis, inflammation, and steatosis. The main question the overall project aims to answer is: • Can multiple novel imaging-based biomarkers, such as shear wave elastography (SWE), shear wave dispersion (SWD), and attenuation imaging (ATI), be used for detailed, non-invasive liver characterization in children, and if so, how should they be used?

This is a phase 2a, multicenter, randomized, double-blind, placebo-controlled study to evaluate the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of NST-6179 in subjects with intestinal failure-associated liver disease (IFALD) receiving parenteral nutrition (PN). The study will be conducted in 2 sequential parts. Up to 36 subjects diagnosed with IFALD will be enrolled in the study, of which up to 18 subjects will be enrolled in each of the 2 parts and randomized (2:1) to receive NST-6179 (N=12/part) or matched placebo (N=6/part). Subjects in Part A will receive once daily (QD) oral administration of 800 mg (32 mL solution) NST-6179 or placebo for 4 weeks. The NST-6179 dose for Part B is planned to be 1200 mg QD for 12 weeks. Actual dose, however, will be determined during the safety review meeting.