A Three-Part, Phase 1/2a, Randomized, Double-blind, Placebo-Controlled, Single and Multiple Dose Study of the Safety, Tolerability, and Pharmacokinetics of ALN-PNP, an siRNA Targeting PNPLA3, in Healthy Adults and Adult Participants With MASLD

Summary

This study is researching an experimental drug called ALN-PNP (called "study drug"). This is a first in human study. The study drug is not approved by any public health agency such as the United States Food and Drug Administration (FDA) for any kind of treatment. This study consists of 3 parts. Part A is focused on healthy participants. Parts B and C of the study are focused on participants who are known to have MASLD and a specific variant of the PNPLA3 gene. The aim of the study is to see how safe, tolerable and effective the study drug is. The study is looking at several other research questions, including: * What side effects may happen from taking the study drug (Parts A, B and C) * How much study drug (Parts A, B and C) and study drug metabolites (byproduct of the body breaking down the study drug) (Parts B and C) are in the blood at different times * Whether the body makes antibodies against the study drug (which could make the study drug less effective or could lead to side effects) (Part A, B and C) * Explore impact of Japanese ethnicity on safety and PK (Pharmacokinetics, or study of what the body does to the drug) of single doses of ALN-PNP over time (Part A) * How the study drug works to change liver fat content in MASLD (Part B and C) * Better understanding of the study drug and MASLD (Part B and C)

Eligibility

Age range

18–75 years

Sex

All

Healthy volunteers

Yes

Interventions

• Drug
  ALN-PNP

  Administered per the protocol

• Drug
  Placebo (PB)

  Administered per the protocol

Locations (6)