Olezarsen Significantly Reduces Triglycerides in Moderate hypertriglyceridemia Patients at ASCVD Risk: Essence study

Topline results from the Essence study show that olezarsen significantly lowered mean triglyceride levels compared to placebo in individuals with moderate hypertriglyceridemia who are at risk for atherosclerotic cardiovascular disease (ASCVD).

Nearly all the participants were on current standard of care lipid-lowering medicines. The trial met its primary endpoint with a statistically significant placebo-adjusted 61% and 58% reduction in triglyceride (TG) levels at 6 months with the 80 mg and 50 mg monthly doses, respectively (p <0.0001). Olezarsen also met all key secondary endpoints in the study. The vast majority of participants reached <150mg/dL, reflecting a reduction to normal TG levels. Olezarsen demonstrated a favorable safety and tolerability profile in the study. Ionis plans to submit an abstract for presentation at an upcoming scientific conference. Data from the pivotal Phase 3 CORE and CORE2 studies evaluating olezarsen for the treatment of severe hypertriglyceridemia (sHTG) are expected in Q3 2025.

“The positive results of this study are an important step in bringing forward a potential new treatment for people with severely elevated triglycerides. Following the FDA approval and encouraging launch of TRYNGOLZA (olezarsen) for people living with familial chylomicronemia syndrome (FCS), a rare, genetic form of severely elevated TGs, these data support olezarsen’s potential to benefit the much broader population of people living with sHTG,” said Sam Tsimikas, M.D., senior vice president, global cardiovascular development at Ionis. “We look forward to seeing the results of our pivotal Phase 3 studies, CORE and CORE2, in Q3 2025, which will be the basis for our potential sNDA filing in sHTG by year-end.”

Olezarsen demonstrated a favorable safety and tolerability profile in the study. The most common treatment-emergent adverse event that occurred more frequently than placebo in the olezarsen groups was injection site reactions, with the majority being mild in severity.

About the Essence Study

The Phase 3 global, multicenter, randomized, double-blind, placebo-controlled study (Essence-TIMI 73b), conducted with Ionis’ research partner, The TIMI Study Group, supports the exposure database for olezarsen. Essence enrolled 1,478 participants aged 18 and older with moderate hypertriglyceridemia (HTG), defined as fasting triglyceride levels ≥150 mg/dL to <500 mg/dL, who were diagnosed with or at risk for atherosclerotic cardiovascular disease (ASCVD). A small percentage of participants (9%) had fasting triglycerides ≥500 mg/dL at baseline. Participants in the study received stable and optimized standard of care lipid-lowering therapies for at least four weeks prior to screening. Participants were randomized to receive 50 mg (n=276) or 80 mg (n=832) of olezarsen or placebo (n=369) every 4 weeks via subcutaneous injection for 12 months.

The primary endpoint was the percent change from baseline in fasting TG levels at six months compared to placebo. Key secondary endpoints included percent changes in triglyceride levels at 12 months, proportion of patients who achieve fasting TG<150 mg/dL and percent changes in other lipid parameters, including apoC-III, remnant cholesterol, non-HDL-C and apoB, compared to placebo over the treatment period.

About Hypertriglyceridemia

Triglycerides (TG) are a type of fat the body uses as a source of energy. While optimal levels for adults are typically below 150 mg/dL, levels higher than 150 mg/dL are a sign of hypertriglyceridemia. Levels higher than 500 mg/dL are a sign of a common condition called severe hypertriglyceridemia (sHTG), which puts millions of people at risk of potentially life-threatening acute pancreatitis (AP) and atherosclerotic cardiovascular disease (ASCVD) despite current standard of care. People with sHTG whose triglyceride levels are more than 880 mg/dL, including those with familial chylomicronemia syndrome (FCS), face a greater risk of AP.

About Olezarsen

Olezarsen is an investigational RNA-targeted medicine being evaluated for the treatment of sHTG. Olezarsen is designed to lower the body's production of apoC-III, a protein produced in the liver that regulates triglyceride metabolism in the blood. The investigational medicine is currently being evaluated in two Phase 3 clinical trials – CORE and CORE2 – for the treatment of sHTG. Olezarsen has not been approved for the treatment of sHTG by regulatory authorities.

Olezarsen was recently approved in the U.S. as an adjunct to diet to reduce triglycerides in adults with FCS under the tradename TRYNGOLZA™ (olezarsen).