Conditions: Hypercholesterolemia
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 23
Healthy volunteers: no

Brief summary:
The primary objective of the study is to assess the pharmacodynamic (PD) effect of alirocumab on serum low density lipoprotein cholesterol (LDL-C) during 14 weeks of subcutaneous (SC) administered alirocumab in patients with autosomal dominant hypercholesterolemia (ADH) and gain-of-function mutation (GOFm) in 1 or both alleles of the proprotein convertase subtilisin/kexin type 9 (PCSK9) gene or with loss-of-function mutation (LOFm) in 1 or more alleles of the apolipoprotein (ApoB) gene.

Detailed description:

Arms:
arm 1: Participants with gain-of-function mutation (GOFm) in proprotein convertase subtilisin/kexin type 9 (PCSK9) gene (Cohort 1): Alirocumab 150 mg subcutaneous (SC) injection at Week 0 (Day 1), Week 2 (Day 15), Week 4, 6 and 10 (matching placebo at Week 8, 12 and 14) during the double-blind period (Group A). Afterwards, participants have the possibility to continue in an open-label extension period with 150 mg alirocumab SC twice per week (Q2W) for an additional 3 years. arm 2: Participants with gain-of-function mutation (GOFm) in proprotein convertase subtilisin/kexin type 9 (PCSK9) gene (Cohort 1): Alirocumab 150 mg subcutaneous (SC) injection at Week 2 (Day 15), Week 4, 6, 8 and 12 (\[matching placebo at Week 0 (Day 1), 10 and 14\]) during the double-blind period (Group B). Afterwards, participants have the possibility to continue in an open-label extension period with 150 mg alirocumab SC twice per week (Q2W) for an additional 3 years. arm 3: Participants with gain-of-function mutation (GOFm) in the proprotein convertase subtilisin/kexin type 9 (PCSK9) gene or loss-of-function mutation (LOFm) in the apolipoprotein (Apo) B gene (Cohort 2): Alirocumab 150 mg subcutaneous (SC) injection at Week 0 (Day 1), Week 2 (Day 15), Week 4, 6 and 10 (matching placebo at Week 8, 12 and 14) during the double-blind period (Group C). Afterwards, participants have the possibility to continue in an open-label extension period with 150 mg alirocumab SC twice per week (Q2W) for an additional 3 years. arm 4: Participants with gain-of-function mutation (GOFm) in proprotein convertase subtilisin/kexin type 9 (PCSK9) gene or loss-of-function mutation (LOFm) in apolipoprotein (Apo) B gene (Cohort 2): Alirocumab 150 mg subcutaneous (SC) injection at Week 2 (Day 15), Week 4, 6, 8 and 12 (\[matching placebo at Week 0 (Day 1), 10 and 14\]) during the double-blind period (Group D). Afterwards, participants have the possibility to continue in an open-label extension period with 150 mg alirocumab SC twice per week (Q2W) for an additional 3 years.

Interventions: intervention 1: Alirocumab intervention 2: Placebo
Intervention descriptions: intervention 1: SC injection in the abdomen intervention 2: SC injection in the abdomen

Protocol document: