A Precision Medicine Approach Using Gene Silencing to Treat a Chronic Liver Disease Called Non-Alcoholic Steatohepatitis (NASH) in Adult Participants at Increased Genetic Risk for This Condition

About the study

This study is researching an investigational drug called ALN-HSD (called "study drug"). This study is focused on participants who are known to have non-alcoholic steatohepatitis (NASH). NASH is a form of non-alcoholic fatty liver disease (NAFLD). Recently, the name metabolic dysfunction associated steatohepatitis (MASH) has been introduced to replace NASH and metabolic dysfunction-associated steatotic liver disease (MASLD) to replace NAFLD. NASH occurs when fat builds up in liver cells, damaging them, and making the liver inflamed and stiff from fibrosis (scar tissue). NASH can progress to cirrhosis (long term scarring) and liver failure (when the liver cannot perform its job). The aim of the study is to see the effect of the study drug on lessening liver scarring side effects related to NASH. The study is looking at several other research questions, including: * How the study drug works to improve liver function and lessen NASH related inflammation in the liver * What side effects may happen from receiving the study drug * How much study drug and study drug metabolites (byproduct of the body breaking down the study drug) are in the blood at different times * Better understanding of the study drug and NASH

Who can take part

You may be eligible to participate in the study if you meet the following criteria:

INCLUSION CRITERIA

Key Inclusion Criteria:

Adult male or female ≥18 years (or country's legal age of adulthood)
A diagnosis of NASH with fibrosis (F) stage 2 or 3
NAS score ≥4 according to the NASH CRN histological scoring system
Meets genotype criteria for study enrollment, as defined in the protocol

EXCLUSION CRITERIA

Key Exclusion Criteria:

Evidence of other forms of known chronic liver disease, as defined in the protocol
Known history of alcohol or other substance abuse within the last year or at any time during screening
History of Type 1 diabetes
Bariatric surgery within approximately 5 years prior to or planned during the study period
Prior exposure to any investigational drug targeting HSD17B13 or patatin-like phospholipase domain containing 3 (PNPLA3) (eg, ALN-HSD or ARO-HSD, AZD2693)

Note: Other protocol-defined Inclusion/Exclusion Criteria apply