Muvalaplin, a novel oral medication, safely and effectively lowers high levels of lipoprotein(a), or Lp(a), results from the phase 2 KRAKEN trial show.

Concentrations of Lp(a) cholesterol are genetically determined and remain steady throughout life. Levels of 125 nmol/L or higher promote clotting and inflammation, significantly increasing the risk for heart attack, stroke, aortic stenosis, and peripheral artery disease. This affects about 20% of the population, particularly people of Black African and South Asian descent.

There are currently no approved therapies that lower Lp(a), said study author Stephen Nicholls, MBBS, PhD, director of the Victorian Heart Institute at Monash University in Melbourne, Australia. Several injectable therapies are currently in clinical trials, but muvalaplin is the only oral option. The new drug lowers Lp(a) levels by disrupting the bond between the two parts of the Lp(a) particle.

The KRAKEN Trial

In the KRAKEN trial, 233 adults from around the world with very high Lp(a) levels (> 175 nmol/L) were randomized either to one of three daily doses of muvalaplin — 10, 60, or 240 mg — or to placebo for 12 weeks.

The researchers measured Lp(a) levels with a standard blood test and with a novel test designed to specifically measure levels of intact Lp(a) particles in the blood. In addition to Lp(a), the standard test detects one of its components, apolipoprotein A particles, that are bound to the drug, which can lead to an underestimation of Lp(a) reductions.

Lp(a) levels were up to 70.0% lower in the muvalaplin group than in the placebo group when measured with the traditional blood test and by up to 85.5% lower when measured with the new test. Approximately 82% of participants achieved an Lp(a) level lower than 125 nmol/L when measured with the traditional blood test, and 97% achieved that level when the new test was used. Patients who received either 60 or 240 mg of muvalaplin had similar reductions in Lp(a) levels, which were greater than the reductions seen in the 10 mg group. The drug was safe and generally well tolerated.

“This is a very reassuring phase 2 result,” Nicholls said when he presented the KRAKEN findings at the American Heart Association (AHA) Scientific Sessions 2024 in Chicago, which were simultaneously published online in JAMA. “It encourages the ongoing development of this agent.”

Lp(a) levels are not affected by changes in lifestyle or diet or by traditional lipid-lowering treatments like statins, said Erin Michos, MD, a cardiologist at the Johns Hopkins University School of Medicine in Baltimore, who was not involved in the study.

And high Lp(a) levels confer significant cardiovascular risk even when other risks are reduced. So muvalaplin is “a highly promising approach to treat a previously untreatable disorder,” she explained.

Larger and longer studies, with more diverse patient populations, are needed to confirm the results and to determine whether reducing Lp(a) also improves cardiovascular outcomes, Michos pointed out.

“While muvalaplin appears to be an effective approach to lowering Lp(a) levels, we still need to study whether Lp(a) lowering will result in fewer heart attacks and strokes,” Nicholls added.