for people ages 18 years and up (full criteria)
at La Jolla, California and other locations
study started
completion around



The purpose of the study is to evaluate the effect of olezarsen on percent change in fasting triglyceride (TG) levels compared to placebo in participants with hypertriglyceridemia and atherosclerotic cardiovascular disease, or with severe hypertriglyceridemia.

Official Title

A Randomized, Double-blind, Placebo-Controlled, Phase 3 Study of Olezarsen (ISIS 678354) in Patients With Hypertriglyceridemia and Atherosclerotic Cardiovascular Disease (Established or at Increased Risk for), or With Severe Hypertriglyceridemia


This is a Phase 3, multi-center, placebo-controlled study in approximately 1475 participants with hypertriglyceridemia and atherosclerotic cardiovascular disease. The study consists of 3 periods: 1) Screening Period: Week -12 to Week -1 (up to 12 weeks); 2) Treatment Period up to Week 53; and 3) Post-Treatment Follow-up Period: Week 54 to Week 66 (13 weeks). Participants enrolled will receive olezarsen or placebo once every 4 weeks during the 53-week Treatment Period.

The Screening Period was extended with no impact to overall study timelines.

A coronary computed tomographic angiography (CTA) sub study will be performed to assess whether triglyceride lowering through inhibition of apoC-III protein synthesis may reduce coronary plaque progression.


Hypertriglyceridemia, Cardiovascular Diseases, Atherosclerosis, ISIS 678354, Olezarsen


You can join if…

Open to people ages 18 years and up

  • Participants must fall into 1 of the following groups (a or b):
    1. Hypertriglyceridemia with fasting TG ≥200 mg/dL (2.26 millimoles per liter [mmol/L]) and <500 mg/dL (5.65 mmol/L) with either
  • Clinical diagnosis of atherosclerotic cardiovascular disease (ASCVD) or
  • At increased risk for ASCVD
    1. Severe hypertriglyceridemia with fasting TG ≥500 mg/dL (5.65 mmol/L)
  • Participants should be on standard of care (SOC) lipid-lowering medications per local guidelines. Lipid-lowering medications should be optimized and stabilized for at least 4 weeks prior to Screening to minimize changes in these medications during the study.

You CAN'T join if...

  • Hemoglobin A1c (HbA1c) ≥ 9.5% at Screening
  • Alanine aminotransferase or aspartate aminotransferase > 3.0 × upper limit of normal
  • Total bilirubin > 1.5 upper limit of normal unless due to Gilbert's syndrome
  • Estimated GFR < 30 mL/min/1.73 m2

NOTE: Other Inclusion/Exclusion criteria may apply.


  • University of California, San Diego (UCSD)
    La Jolla California 92037 United States
  • Diabetes/Lipid Management & Research Center
    Huntington Beach California 92648 United States


in progress, not accepting new patients
Start Date
Completion Date
Ionis Pharmaceuticals, Inc.
Phase 3 research study
Study Type
About 1478 people participating
Last Updated