Ionis Pharmaceuticals’ Tryngolza has succeeded in two crucial late-stage tests that could considerably broaden the drug’s commercial reach, the company said Tuesday.
Ionis is mulling how to price the drug in these patients, who have severely high levels of fat molecules called triglycerides. The drug is already in the rare disease market with a list price of almost $600,000.
In two Phase 3 trials in patients with severe hypertriglyceridemia (sHTG), the drug cut triglyceride levels by up to 72% at six months. It also reduced cases of acute pancreatitis (AP), a potentially fatal condition that can result from high triglyceride levels, by 85%. Both figures are adjusted for placebo.
“The results were unprecedented, groundbreaking, just really remarkable,” Ionis CEO Brett Monia told
Endpoints News
ahead of the data release. “An 85% reduction in AP has never been shown before in this patient population,” he added.
Ionis said it would file this year to expand the drug’s label into sHTG. Monia said the drug could be launched in this new indication in the second half of 2026. Tryngolza is
already approved
for a genetic disease called familial chylomicronemia syndrome (FCS), in which the body struggles to break down triglycerides.
Tuesday’s data come from studies known as CORE and CORE2, which enrolled patients who were already on standard-of-care lipid-lowering therapy.
Analysts from TD Cowen wrote in an Aug. 25 note that cardiologists were seeking a 50% triglyceride reduction in these studies. A 50% drop in triglycerides could lead to a 30-50% reduction in AP events, the analysts said.
Tryngolza steamed past these benchmarks. In the CORE trial, a 72% triglyceride reduction was seen with the higher dose of 80 mg, given subcutaneously monthly. The lower dose, 50 mg, achieved a 63% placebo-adjusted drop.
In CORE2, the placebo-adjusted triglyceride reductions were less pronounced, at 55% and 49% with the same high and low doses, respectively, owing to a much higher placebo response. Placebo recipients in CORE2 had a 14% drop in their triglycerides, whereas in CORE, the placebo reduction was just 0.5%.
Monia said that he doesn’t have a clear explanation for why the placebo response was so much stronger in CORE2, although it might come down to where the trials were conducted.
“We’re still working through the data. We’ll be looking at things like, were the sites different or similar?” he said. “We had some sites that were overlapping in CORE and CORE2, and then we had some unique sites for CORE and CORE2 as well.”
Both trials had sites in the US, Europe and Canada, but CORE had unique sites in Australia, New Zealand, Israel, South Africa and Turkey. CORE2, but not CORE, had sites in Mexico, Argentina, India and Malaysia, according to the US federal clinical trials database.
CORE and CORE2 enrolled 617 and 446 patients, respectively, with those in CORE having slightly higher
baseline triglycerides
— 836 mg/dL versus 749 mg/dL in CORE2. The trials were identical in recruitment criteria and endpoints.
Monia stressed that the placebo-adjusted triglyceride cut in CORE2 was “still remarkable.” All the triglyceride reductions in both trials were highly statistically significant versus placebo, with p-values below 0.0001.
The 85% reduction in AP events, which comes from data pooled across both doses and both trials and was measured at one year, was also statistically significant at p=0.0002.
Ionis’ pivotal data in sHTG raise the stakes for Arrowhead’s similar candidate, plozasiran. That oligonucleotide is in two pivotal Phase 3 trials, named SHASTA-3 and -4, also for severe hypertriglyceridemia, with data expected next year.
In its Phase 2 SHASTA-2 trial in sHTG, plozasiran
achieved
a 58% reduction in triglyceride levels after nearly one year, versus 7% for placebo. That study did not assess AP rates.
Side effects in CORE and CORE2 were generally balanced across treatment groups, and serious adverse events occurred less frequently with Tryngolza than with placebo, Ionis said. Injection site reactions, which were mostly mild, happened more often with the drug, however.
Tryngolza’s list price for the rare condition FCS is $595,000 per year. And that price would not be competitive in sHTG, a disorder estimated to affect around three million people in the US alone.
“We will step the price down. We haven’t settled on the price yet,” Monia said. He added that the new price would be consistent with “drugs of similar nature” in the cardiovascular space, which he said have an annual price in the $10,000 to $20,000 range, though that is “not definitive.”
He added that the new data put the company in a strong position for negotiations with payers.
But Tryngolza will lose its rare disease price even for FCS patients if it is approved for sHTG, because FCS patients will simply be folded into the sHTG population.
“FCS patients will benefit from the price change. Once we get there for sHTG, it’ll be one price for FCS and sHTG,” Monia said. “We’ll announce price once we get approval.”
Ionis will launch the drug in the US, and its
partner Sobi
will take charge everywhere else except Canada and China.
Tryngolza brought Ionis $19 million in the second quarter of 2025, a threefold increase over its first quarter sales. The product is an antisense oligonucleotide that works to reduce production of apolipoprotein C-III, which regulates triglyceride metabolism in the blood.
Data in moderate HTG were
presented
at the annual meeting of the European Society of Cardiology in Madrid on Saturday.