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Barcelona, Spain – 28 Aug 2017: Inclisiran lowers low-density lipoprotein (LDL; “bad”) cholesterol for up to one year in patients with high cardiovascular risk and elevated LDL cholesterol, according to late-breaking results from the ORION 1 trial presented today in a Hot Line LBCT Session at ESC Congress. (1)
“The ease of dosing – small volume subcutaneous injections twice a year most likely given by healthcare professionals – promises to improve patient adherence to lipid therapy, which has been a real problem with all other approaches,” said principal investigator Prof Kausik K Ray, professor of public health, Imperial College London, UK, and honorary consultant cardiologist, Imperial College NHS Trust.
ORION 1 is a multicentre, placebo-controlled, double-blind, randomised phase II study on the impact of single or multiple subcutaneous injections of inclisiran on LDL cholesterol reductions over one year. Inclisiran is a first-in-class investigational drug that acts by turning off PCSK9 synthesis in the liver. The objective was to identify the dose and dosing frequency required for the phase III trials.
The trial included 501 patients with atherosclerotic cardiovascular disease (ASCVD) and elevated LDL cholesterol (>70mg/ml) despite maximum tolerated statin therapy and patients without ASCVD but with high cardiovascular risk conditions such as diabetes and familial hypercholesterolaemia in whom LDL cholesterol was >100mg/dl despite maximally tolerated statin therapy.
Patients were randomised into eight treatment groups: a single dose regimen of 200, 300 or 500 mg inclisiran, or placebo; or a two dose regimen of 100, 200 or 300 mg inclisiran, or placebo, at days one and 90.
The primary endpoint was the percentage change in LDL cholesterol at six months for each dose of inclisiran versus placebo. As previously reported, the two dose 300 mg inclisiran regimen gave the greatest reduction in LDL cholesterol at six months. (2)
Today researchers report results of one of the secondary endpoints, which was the change in LDL cholesterol at one year with one or two doses of inclisiran. Against a background therapy of statins (73%), alone or with ezetimibe (31%), the time averaged reductions in LDL cholesterol at one year with a single dose of 200, 300 or 500 mg inclisiran were -31.6%, -38.1% and -39.8%, respectively. The time averaged reductions in LDL cholesterol at one year with a two dose regimen of 100, 200 or 300 mg inclisiran were -31.0%, -41.1% and -46.8%, respectively.
As expected based on predictive modelling, patients began to return to their baseline LDL cholesterol values by an average of 2–3% per month, meaning they will be back to their starting levels by about 18–21 months for the two dose groups. Every patient on the two dose regimen had a significant response and the mean LDL cholesterol reductions over time were practically constant. Safety was generally similar between inclisiran and placebo apart from a small numerical excess of injection site reactions with the study drug.
Prof Ray said: “These one year data affirm and extend the six month results. The two dose 300 mg regimen produced the greatest reductions in LDL cholesterol, with an average time-adjusted fall of almost 50% at one year. The sustained LDL cholesterol lowering effects of inclisiran were achieved without side effects and were accompanied by predictable and gradual reversal. The data support dosing twice a year after initial injections on days one and 90.”
Sources of funding: The study was sponsored by The Medicines Company.
Disclosures: Prof Ray reports acting as Consultant to The Medicines Company.
References and notes:(1) The study “Impact of a single or two dose regimen of inclisiran, a novel siRNA inhibitor to PCSK9 on time averaged reductions in LDL-C over 1 year. ORION 1” will be presented during:• The press conference Hot Line - Late Breaking Clinical Trials 2 on Monday 28 August from 09:00 to 10:00.• The session Hot Line - Late Breaking Clinical Trials 2 on Monday 28 August from 11:00 to 12:45 in Barcelona – Main Auditorium.(2) Ray KK, et al. Inclisiran in patients at high cardiovascular risk with elevated LDL cholesterol. N Engl J Med. 2017;376(15):1430–1440. doi: 10.1056/NEJMoa1615758. Epub 2017 Mar 17.
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To access all the scientific resources from the sessions during the congress, visit ESC Congress 365. About the European Society of CardiologyThe European Society of Cardiology brings together health care professionals from more than 140 countries, working to advance cardiovascular medicine and help people lead longer, healthier lives.About ESC Congress 2017ESC Congress is the world’s largest and most influential cardiovascular event contributing to global awareness of the latest clinical trials and breakthrough discoveries. ESC Congress 2017 takes place 26 to 30 August at the Fira Gran Via in Barcelona, Spain. The scientific programme is here. More information is available from the ESC Press Office at firstname.lastname@example.org.This press release accompanies both a presentation and an ESC press conference at the ESC Congress 2017. Edited by the ESC from material supplied by the investigators themselves, this press release does not necessarily reflect the opinion of the European Society of Cardiology. The content of the press release has been approved by the presenter.
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