Novel Lipoprotein (a) Therapies: A Comprehensive Review
Lipoprotein(a) [Lp(a)] is a genetically determined, independent risk factor for atherosclerotic cardiovascular disease and calcific aortic valve stenosis. Plasma Lp(a) levels are 70–90% heritable, largely unresponsive to lifestyle changes, and poorly controlled with typical lipid-lowering drugs such as statins and PCSK9 inhibitors. The development of powerful RNA-based therapies offers a new chance to specifically target and significantly lower Lp(a). We examined available phase 1–3 trial data, regulatory updates, and trial registries up to mid-2026 to provide an overview of the current pipeline, ongoing cardiovascular outcomes trials (CVOTs), and new mechanistic and genomic methods. Five agents across three mechanisms have reached late-stage development. Pelacarsen, a GalNAc-conjugated antisense oligonucleotide (ASO), reduces Lp(a) by about 80% via hepatic apo(a) mRNA reduction and is the subject of the phase 3 Lp(a) HORIZON trial, with results due in late 2026. Three small interfering RNA (siRNA) drugs, olpasiran (> 95% reduction, OCEAN(a)-Outcomes), lepodisiran (93.9% reduction lasting over 12 months after one dose, ACCLAIM-Lp(a)), and zerlasiran (96.4% reduction), allow quarterly or possibly yearly dosing. Muvalaplin, the first oral small-molecule Lp(a) inhibitor, interferes with apo(a)-ApoB particle formation and reduces intact Lp(a) by up to 85.8% in phase 2 KRAKEN trials; its phase 3 CVOT (MOVE-Lp(a)) is underway. Additionally, CRISPR/Cas9-based liver gene editing targeting the LPA gene (CTX320) has entered phase 1 studies. All agents have shown good safety so far. The Lp(a) treatment landscape has moved from basic science to an active late-stage clinical pipeline. Positive outcomes from these CVOTs could lead to regulatory approvals and guideline updates affecting hundreds of millions of high-risk patients globally. Recent guidelines now recommend universal Lp(a) measurement, in anticipation of more effective therapies becoming available within the next 1 to 2 years. Created in BioRender. https://biorender.com/y1mu0lh Created in BioRender. https://biorender.com/y1mu0lh