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This phase 3 trial showed that treatment with volanesorsen, an antisense oligonucleotide drug complementary to mRNA encoding apolipoprotein C-III, resulted in a mean reduction in triglyceride levels of 77% over the course of 3 months.

In a randomized trial, patients with type 2 diabetes, hypertriglyceridemia, and low HDL cholesterol who received pemafibrate did not have fewer cardiovascular events, although some lipid levels decreased.

Weekly doses of an antisense inhibitor of apolipoprotein C-III (APOC3) in persons with severe or uncontrolled hypertriglyceridemia resulted in a reduction in APOC3 and triglyceride levels at the end of 13 weeks. Elevated triglyceride levels are associated with several pathologic conditions, including insulin resistance, the metabolic syndrome, diabetes, cardiovascular disease, and hereditary disorders, such as the familial chylomicronemia syndrome, familial combined hyperlipidemia, and familial hypertriglyceridemia. 1 , 2 Patients with triglyceride levels above 2000 mg per deciliter (22.6 mmol per liter), measured at the peak of abdominal pain, are at high risk for pancreatitis. 3 , 4 Current guidelines from the Endocrine Society and the European Atherosclerosis Society recommend that fasting triglyceride levels should be maintained at values below 1000 mg per deciliter (11.3 mmol per liter) or 10 mmol per liter, respectively, to prevent intermittent . . .

In a phase 2b trial involving patients with hypertriglyceridemia, the use of olezarsen (which targets APOC3 mRNA) for 6 months reduced triglyceride levels by approximately 50% as compared with placebo.

Persistent chylomicronemia is a genetic recessive disorder that is classically caused by familial chylomicronemia syndrome (FCS), but it also has multifactorial causes. The disorder is associated with the risk of recurrent acute pancreatitis. Plozasiran is a small interfering RNA that reduces hepatic production of apolipoprotein C-III and circulating triglycerides. In a phase 3 trial, we randomly assigned 75 patients with persistent chylomicronemia (with or without a genetic diagnosis) to receive subcutaneous plozasiran (25 mg or 50 mg) or placebo every 3 months for 12 months. The primary end point was the median percent change from baseline in the fasting triglyceride level at 10 months. Key secondary end points were the percent change in the fasting triglyceride level from baseline to the mean of values at 10 months and 12 months, changes in the fasting apolipoprotein C-III level from baseline to 10 months and 12 months, and the incidence of acute pancreatitis. At baseline, the median triglyceride level was 2044 mg per deciliter. At 10 months, the median change from baseline in the fasting triglyceride level (the primary end point) was -80% in the 25-mg plozasiran group, -78% in the 50-mg plozasiran group, and -17% in the placebo group (P<0.001). The key secondary end points showed better results in the plozasiran groups than in the placebo group, including the incidence of acute pancreatitis (odds ratio, 0.17; 95% confidence interval, 0.03 to 0.94; P = 0.03). The risk of adverse events was similar across groups; the most common adverse events were abdominal pain, nasopharyngitis, headache, and nausea. Severe and serious adverse events were less common with plozasiran than with placebo. Hyperglycemia with plozasiran occurred in some patients with prediabetes or diabetes at baseline. Patients with persistent chylomicronemia who received plozasiran had significantly lower triglyceride levels and a lower incidence of pancreatitis than those who received placebo. (Funded by Arrowhead Pharmaceuticals; PALISADE ClinicalTrials.gov number, NCT05089084.).

The results of this phase 3 trial of the effect of olezarsen, a drug that targets APOC3 mRNA, on plasma triglyceride levels and acute pancreatitis in familial chylomicronemia syndrome support further clinical research.

In this study, investigators found that APOC3, a key regulator of triglyceride metabolism, had a profound and clinically relevant effect on triglyceride levels through a mechanism that is independent of lipoprotein lipase. The familial chylomicronemia syndrome is a rare autosomal recessive disease characterized by the buildup in the blood of fat particles called chylomicrons (chylomicronemia), severe hypertriglyceridemia, and the risk of recurrent and potentially fatal pancreatitis and other complications. 1 It is caused by mutations in the gene encoding LPL or, less frequently, by mutations in genes encoding other proteins necessary for LPL function. 2 Patients with this syndrome have plasma triglyceride levels ranging from 10 to 100 times the normal value (1500 to 15,000 mg per deciliter [17 to 170 mmol per liter]), eruptive xanthomas, arthralgias, neurologic symptoms, lipemia retinalis, and hepatosplenomegaly. 3 Nearly . . .

Sequencing of the gene encoding apolipoprotein C3 ( APOC3 ) in participants in two general-population studies identified three rare loss-of-function mutations associated with low plasma triglyceride levels. The risk of ischemic vascular disease was reduced by 41% among carriers of these mutations. Low-density lipoprotein (LDL) cholesterol is the principal target of lipid drugs that have been developed for the prevention of cardiovascular disease. However, even among patients with substantial reductions in LDL cholesterol levels, residual cardiovascular risk persists. 1 Spurred by the strong association between high levels of both fasting and nonfasting triglycerides and the risk of cardiovascular disease, 2 – 6 recent genetic studies involving mendelian randomization have suggested that high levels of nonfasting triglycerides are causally associated with an increased risk of ischemic cardiovascular disease, independent of high-density lipoprotein (HDL) cholesterol levels. 7 , 8 Plasma triglycerides are markers of so-called remnant particles, which include . . .

Whole-exome sequencing revealed an association between four rare loss-of-function mutations in the apoliprotein C3 gene ( APOC3 ) and low plasma triglyceride levels. Carriers of these mutations had a reduction in the risk of coronary heart disease of nearly 40%. In observational studies, plasma triglyceride levels are associated with the risk of coronary heart disease. 1 , 2 Heritability accounts for more than 50% of the individual variation in triglyceride levels. 3 Genomewide association studies have identified common DNA sequence variants at more than 150 genetic loci that are related to plasma lipids 4 , 5 and have suggested that plasma triglyceride-rich lipoproteins directly influence the risk of coronary heart disease. 6 These findings lead to two unanswered questions: first, to what extent do rare DNA sequence variants, particularly those in protein-coding sequences, contribute to individual variation in plasma triglyceride levels and the risk of coronary . . .

Apolipoprotein C-III (apoC-III) inhibits triglyceride hydrolysis and has been implicated in coronary artery disease. Through a genome-wide association study, we have found that about 5% of the Lancaster Amish are heterozygous carriers of a null mutation (R19X) in the gene encoding apoC-III (APOC3) and, as a result, express half the amount of apoC-III present in noncarriers. Mutation carriers compared with noncarriers had lower fasting and postprandial serum triglycerides, higher levels of HDL-cholesterol and lower levels of LDL-cholesterol. Subclinical atherosclerosis, as measured by coronary artery calcification, was less common in carriers than noncarriers, which suggests that lifelong deficiency of apoC-III has a cardioprotective effect.