Study of Zodasiran in Adolescent Participants With Homozygous Familial Hypercholesterolemia

Inclusion Criteria: * Adolescents 12 to \<18 years of age who are nonpregnant, nonlactating, and do not plan to become pregnant during the study * Body weight ≥35 kilograms (kg) at screening * HoFH based on a supportive genetic test (from a source-verifiable medical record or based on screening genotype) or clinical diagnosis * Screening LDL-C ≥116 mg/dL (3 mmol/L) * Screening hemoglobin A1c (HbA1c) ≤9.5% * Total bilirubin \<2×upper limit of normal (ULN), unless in previously confirmed cases of Gilbert's syndrome * Alanine aminotransferase or aspartate aminotransferase \<3×ULN Exclusion Criteria: * Use of a hepatocyte-targeted siRNA within 365 days before Day 1 (except inclisiran, which is permitted; administration of inclisiran and study drug must be separated by at least 4 weeks) * Use of an antisense oligonucleotide molecule within 3 months before Day 1 * Use of evinacumab within 3 months before Day 1 * Non-response to evinacumab, defined as LDL-C reduction \<15% from baseline after 2 doses * Use of systemic corticosteroids (unless used as replacement therapy for pituitary/adrenal disease with a stable regimen) NOTE: Additional inclusion/exclusion criteria may apply per protocol