Ionis partner Novartis announces Lp(a)HORIZON Phase 3 topline results for pelacarsen in patients with elevated Lp(a) and established cardiovascular disease (CVD)
Novartis and Ionis Pharmaceuticals (IONS) announced that the Phase 3 Lp(a)HORIZON study of pelacarsen in patients with elevated Lp(a) and established cardiovascular disease (CVD) did not meet its primary endpoint of reducing cardiovascular events. However, the drug achieved substantially lower Lp(a) levels and had an acceptable safety profile. Ionis continues to advance its own pipeline and commercial medicines, including TRYNGOLZA, DAWNZERA, and ZANVASTRO. The full study data will be presented
How this was made

The 30-second read
Why it matters
The failure underscores the challenge of translating biomarker reduction into clinical outcomes, possibly affecting pipeline valuation and partnership dynamics.
Market read
Primary biotech news with direct impact on IONS; limited broader market effect.
What to watch
Potential for future indications or combination therapies could revive the asset.
Background
Ionis partnered with Novartis on pelacarsen, an antisense oligonucleotide aimed at lowering lipoprotein(a). The trial enrolled over 8,000 patients with elevated Lp(a) and established cardiovascular disease.
Ticker impact
Ionis Pharmaceuticals announced that its Phase 3 pelacarsen trial failed to meet the primary cardiovascular endpoint.
downward pressure on IONS in the short term
Phase 3 failure is material for a biotech and directly affects future revenue expectations.
Market effects
May dampen investor sentiment in the RNA‑targeted therapeutics sector.
Limited to US biotech investors; no broader regional effect.
Minimal global impact beyond biotech-focused funds.
Counterpoint
Some investors may view the Lp(a) reduction as a long‑term value despite the missed endpoint.
Key entities
- companyIonis Pharmaceuticals
US‑listed biotech developing pelacarsen.
- companyNovartis
Partner licensing pelacarsen rights.


