Cited by 775Lipoproteins and Cardiovascular HealthRNA Interference and Gene DeliveryCholesterol and Lipid Metabolism

A highly durable RNAi therapeutic inhibitor of PCSK9

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Fitzgerald, Kevin, White, Suellen, Borodovsky, Anna, Bettencourt, Brian R., Strahs, Andrew, Clausen, Valerie, Wijngaard, Peter, Horton, Jay D. +7 more·2017·New England Journal of Medicine

Abstract

BACKGROUND: Inclisiran (ALN-PCSsc) is a long-acting RNA interference (RNAi) therapeutic agent that inhibits the synthesis of proprotein convertase subtilisin-kexin type 9 (PCSK9), a target for the lowering of low-density lipoprotein (LDL) cholesterol. METHODS: In this phase 1 trial, we randomly assigned healthy volunteers with an LDL cholesterol level of at least 100 mg per deciliter in a 3:1 ratio to receive a subcutaneous injection of inclisiran or placebo in either a single-ascending-dose phase (at a dose of 25, 100, 300, 500, or 800 mg) or a multiple-dose phase (125 mg weekly for four doses, 250 mg every other week for two doses, or 300 or 500 mg monthly for two doses, with or without concurrent statin therapy); each dose cohort included four to eight participants. Safety, the side-effect profile, and pharmacodynamic measures (PCSK9 level, LDL cholesterol level, and exploratory lipid variables) were evaluated. RESULTS: The most common adverse events were cough, musculoskeletal pain, nasopharyngitis, headache, back pain, and diarrhea. All the adverse events were mild or moderate in severity. There were no serious adverse events or discontinuations due to adverse events. There was one grade 3 elevation in the γ-glutamyltransferase level, which was considered by the investigator to be related to statin therapy. In the single-dose phase, inclisiran doses of 300 mg or more reduced the PCSK9 level (up to a least-squares mean reduction of 74.5% from baseline to day 84), and doses of 100 mg or more reduced the LDL cholesterol level (up to a least-squares mean reduction of 50.6% from baseline). Reductions in the levels of PCSK9 and LDL cholesterol were maintained at day 180 for doses of 300 mg or more. All multiple-dose regimens reduced the levels of PCSK9 (up to a least-squares mean reduction of 83.8% from baseline to day 84) and LDL cholesterol (up to a least-squares mean reduction of 59.7% from baseline to day 84). CONCLUSIONS: In this phase 1 trial, no serious adverse events were observed with inclisiran. Doses of 300 mg or more (in single or multiple doses) significantly reduced levels of PCSK9 and LDL cholesterol for at least 6 months. (Funded by Alnylam Pharmaceuticals and the Medicines Company; ClinicalTrials.gov number, NCT02314442 .).

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Crossref · 10.1056/nejmoa1609243

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  • Inclisiran is the first siRNA approved by both US FDA and EMA for the treatment of hypercholesterolemia; subcutaneous injection of a lipid nanoparticle formulation displays high potency in lowering liver PCSK9 and plasma LDL-C levels.

    “Inclisiran is the first siRNA approved by both US FDA and EMA for the treatment of hypercholesterolemia; the subcutaneous injection of a lipid nanoparticle formulation of the drug, which specifically binds hepatocyte asialoglycoprotein receptors, displays high potency in lowering liver PCSK9 and plasma LDL-C levels [161,162].”

    From The Emerging Role of PCSK9 in the Pathogenesis of Alzheimer’s Disease: A Possible Target for the Disease Treatment (2024) · cites this paper as [161]

    The Methods and Discussion report subcutaneous inclisiran and substantial reductions in circulating PCSK9 and LDL cholesterol. The paper describes inclisiran as a carbohydrate-conjugated siRNA, not a lipid-nanoparticle formulation; it identifies the lipid nanoparticle as a different, intravenous agent. It does not establish FDA or EMA approval, and its measured PCSK9 outcome was in plasma rather than liver tissue (page numbers unavailable). (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • A single subcutaneous injection of trivalent GalNAc-conjugated siRNA can achieve efficacy for >12 months.

    “A single subcutaneous injection of trivalent GalNAc-conjugated siRNA can achieve efficacy for >12 months22, 2324.”

    From A divalent siRNA chemical scaffold for potent and sustained modulation of gene expression throughout the central nervous system (2019) · cites this paper as [22]

    The Methods and Results describe a single subcutaneous dose of inclisiran, a triantennary GalNAc-conjugated siRNA, with reductions in PCSK9 and LDL cholesterol maintained at day 180. The paper reports follow-up only to 180 days and discusses potential dosing every 3 or 6 months; it does not establish efficacy beyond 12 months. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • A fibrate-induced increase in homocysteine may blunt HDL cholesterol and ApoA1 elevation and may contribute to smaller than estimated benefits of fenofibrate on cardiovascular outcomes.

    “However, a fibrate-induced increase in homocysteine may blunt elevation of both HDL-C and ApoA1 levels, and this effect may contribute to the smaller than estimated benefits of fenofibrate in CV outcome parameters [322].”

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Authors
Fitzgerald, K., White, S., Borodovsky, A., Bettencourt, B. R., Strahs, A., Clausen, V., Wijngaard, P., Horton, J. D., Taubel, J., Brooks, A., Fernando, C., Kauffman, R. S., Kallend, D., Vaishnaw, A., & Simon, A.
Affiliations
  • Alnylam Pharmaceuticals (United States) (US)
  • St George's, University of London (GB)
Venue
New England Journal of Medicine
Published
2017-01-05
Volume
376
Issue
1
Pages
41-51
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2555483953
Cited by
768
References
29
Citations by year
2026: 43 · 2025: 61 · 2024: 84 · 2023: 89 · 2022: 85 · 2021: 68 · 2020: 88 · 2019: 76 · 2018: 95 · 2017: 74 · 2016: 3 · 2013: 1
FWCI
91.52
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Heart, Lung, and Blood Institute (P01HL020948)
Topics
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
inclisiran, PCSK9 inhibition, RNA interference therapy, LDL cholesterol lowering, hypercholesterolemia, statin therapy, pharmacokinetics, pharmacodynamics, safety, multiple-dose regimen, single ascending dose, healthy volunteers, lipid-lowering drugs, hypertriglyceridemia, hyperuricemia
MeSH terms
RNAi Therapeutics, Proprotein Convertase 9, PCSK9 Inhibitors, Acetylgalactosamine, Adolescent, Adult, Aged, Anticholesteremic Agents, Female, Humans, Injections, Subcutaneous, Cholesterol, LDL, Male, Middle Aged, Single-Blind Method, RNA, Small Interfering, RNA-Induced Silencing Complex, Young Adult, Healthy Volunteers

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