
Idorsia claims PhIII win for hypertension drug at center of $230M J&J deal
Months after earning its first approval, Idorsia is back with a Phase III win for a different, J&J-partnered drug.
The Swiss biotech said aprocitentan, its dual endothelin receptor antagonist, has aced a late-stage trial involving patients with resistant hypertension, spurring statistically significant reductions in blood pressure on top of background therapy.
The topline results confirm Idorsia’s hypothesis that endothelin is the “missing link” for patients whose hypertension can’t be controlled by existing therapies, according to CSO Martine Clozel. By its estimate, by 2025 that group could total 10 million in the US alone.
“I have long been convinced that resistant hypertension is only resistant to treatment because the endothelin system had not been tackled,” she said in a statement. “The observation of high endothelin levels in populations most at risk of developing resistant hypertension, as well as the close association between endothelin and the comorbidities often seen in patients with resistant hypertension, suggested that endothelin is a key contributor to the problem.”
J&J paid Idorsia $230 million back in 2017 to snag commercialization rights to the drug on the back of its $30 billion buyout of Actelion, which was run by the husband-and-wife team of CEO Jean-Paul Clozel and CSO Martine Clozel. They spun out the R&D work into Idorsia, and notched their first OK earlier this year when the FDA approved its treatment for insomnia. The EMA followed with its own endorsement days ago.
In the Phase III trial, which enrolled 1,971 patients, investigators first gave all participants a fixed-dose combination of a calcium channel blocker (amlodipine), an angiotensin receptor blocker (valsartan) and a diuretic (hydrochlorothiazide) for at least four weeks before entering a four-week run-in period where placebo was added to the background therapy. Patients whose blood pressure remains consistently high were then moved into the first treatment part of the study.
A total of 730 patients were randomized to one of three groups: 12.5 mg aprocitentan, 25 mg aprocitentan or placebo.
After 4 weeks of treatment, a statistically significant and clinically meaningful reduction in the primary endpoint measure of systolic blood pressure – assessed by measurement at trough of unattended automated office blood pressure (AOBP) – was observed in both the 12.5 mg (p<0.005) and 25 mg (p<0.005) aprocitentan groups compared to placebo.
In Part 2, all patients got 25 mg aprocitentan for 32 weeks, where the reduction in blood pressure was observed across groups.
Then moving onto Part 3, Idorsia re-randomized patients so that half got placebo again — and saw their systolic blood pressure increase.
“This provided replication of the treatment effect of aprocitentan and confirmed its durable antihypertensive effect,” the company wrote.