625115-55-1 CAS NO
Riociguat (BAY 63-2521) is a novel drug that is currently in clinical development by Bayer. It is a stimulator of soluble guanylate cyclase (sGC). At the moment Phase III clinical trialsinvestigate the use of riociguat as a new approach to treat two forms of pulmonary hypertension (PH): chronic thromboembolic pulmonary hypertension (CTEPH) andpulmonary arterial hypertension (PAH). Riociguat constitutes the first drug of a novel class of sGC stimulators.
Sunday, February 10, 2013
In CHEST-1 patients treated with riociguat showed a statistically significant improvement from baseline in the six-minute walking test (6MWT) after 16 weeks, compared to those receiving placebo. The study included both patients with inoperable CTEPH and those with persistent or recurrent disease after a surgical procedure called pulmonary endarterectomy (PEA). The PATENT-1 study met its primary endpoint by demonstrating a statistically significant improvement from baseline in the 6MWT, after 12 weeks compared with placebo. PATENT-1 included both treatment naïve symptomatic PAH patients and those pre-treated with ERAs or non-iv prostanoid monotherapy.
Phase I clinical trials
One of the first studies was designed to test the safety profile, pharmacokinetics andpharmacodynamics of single oral doses of riociguat (0.25–5 mg). 58 healthy male subjects were given riociguat orally (oral solution or immediate-release tablet) in a randomised, placebo-controlled trial. Doses of riociguat were increased stepwise, and riociguat was well tolerated up to 2.5 mg.
Phase II clinical trials
A proof-of-concept study, reported by the University of Gießen Lung Center, was the first small study (in 4 PAH patients) to investigate safety, tolerability, pharmacokinetics and efficacy parameters. The drug was well-tolerated and superior to NO in efficacy and duration.
An open-label, non-controlled phase II trial of riociguat in 75 adult patients (42 with CTEPH and 33 with PAH, all in World Health Organization (WHO) functional class II or III) evaluated the safety and tolerability, and the effects on hemodynamics, exercise capacity and functional class. Riociguat was given three times daily for 12 weeks. Doses were titrated at 2-week intervals from 1.0 mg three times daily to a maximum of 2.5 mg three times daily. Riociguat had a favourable safety profile, and also significantly improved exercise capacity and hemodynamic parameters such as pulmonary vascular resistance, cardiac output and pulmonary arterial pressure compared to baseline values.
In addition, a phase II study of riociguat is underway in patients suffering from other forms of PH such as associated with interstitial lung disease (PH-ILD). First results from this study are expected in 2011.
Phase III clinical trials
The phase III trials on riociguat are multi-center studies. The study program includes large randomized, double-blind, placebo-controlled pivotal trial phase (CHEST-1 and PATENT-1), and open-label extensions of these studies (CHEST-2 and PATENT-2). Details of these studies are reported on ClinicalTrials.gov, a register of studies maintained by the National Institutes of Health (NIH).
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- ClinicalTrials.gov: Riociguat
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- ClinicalTrials.gov NCT00694850 Impact of Multiple Doses of BAY 63-2521 on Safety, Tolerability, Pharmacokinetics and Pharmacodynamics in Patients With Interstitial Lung Disease (ILD) Associated Pulmonary Hypertension