GSK today announced that the European Commission has approved a variation to expand the current therapeutic indication for Volibris® (ambrisentan) to include its use in combination treatment for patients with pulmonary arterial hypertension (PAH). Volibris is indicated for treatment of PAH in adult patients of WHO Functional Class (FC) II to III, including use in combination treatment.
This decision was based on data from the Phase 3b/4 AMBITION study, which showed that the combination of ambrisentan and tadalafil reduced the risk of clinical failure by 50% in treatment-naïve PAH patients compared to pooled ambrisentan and tadalafil monotherapy (p=<0.001)1.
“PAH is a rare, chronic and life-changing disease that can result in heart failure and death if left untreated. The AMBITION study has demonstrated that the early combination of two treatments that target different pathways in PAH can halve the risk of clinical failure and more than half the rate of hospitalisation for patients, compared to either treatment given individually. The expanded authorisation for Volibris will make an important difference to the future management of PAH and the outcomes of patients living with this highly debilitating condition”, said Jonathan Langley, Clinical Investigation Lead for PAH at GSK.
AMBITION was the first and only outcomes study to compare the efficacy and safety of investigational first-line combination therapy of ambrisentan and tadalafil to first-line monotherapy of either treatment alone in treatment-naïve patients with PAH. AMBITION was co-sponsored by GSK and Gilead, with support provided by Eli Lilly.
Further regulatory submissions to include the AMBITION data in the ambrisentan label are ongoing and planned in other countries.
About Ambrisentan
Ambrisentan, a selective endothelin type-A receptor antagonist, is approved in the EU and other countries as a once-daily treatment for PAH, (WHO Group 1) in patients with WHO/NYHA functional class II and III symptoms. GSK commercialises ambrisentan under the tradename Volibris® in territories outside of the United States and Gilead commercialises ambrisentan under the tradename Letairis® in the U.S. Ambrisentan has been granted orphan drug status for the treatment of PAH in Australia, Europe, Japan, Korea and United States.
For the approved indication and EU summary of product characteristics for ambrisentan, please visit www.ema.europa.eu. Prior to the label being posted online, a copy of the label may be requested from one of the GSK Media or Investor Relations contacts listed in the “GSK Enquiries” section at the end of this document.
Letairis and Volibris are registered trademarks of Gilead Sciences, Inc or one of its related companies.
About Pulmonary Arterial Hypertension (WHO Group 1)
PAH is a debilitating disease characterised by constriction of the blood vessels in the lungs leading to high pulmonary arterial pressures. These high pressures make it difficult for the heart to pump blood through the lungs to be oxygenated. Patients with PAH suffer from shortness of breath as the heart struggles to pump against these high pressures, causing such patients to ultimately die of heart failure.
PAH can occur with no known underlying cause, or it can occur secondary to diseases such as connective tissue disease, congenital heart defects, cirrhosis of the liver and HIV infection2. PAH afflicts approximately 200,000 patients worldwide3.
Important Safety Information for ambrisentan in the European Union
The following Important Safety Information is based on a summary of the Summary of Product Characteristics for ambrisentan. Please consult the full Summary of Product Characteristics for all the labelled safety information for ambrisentan.
Ambrisentan
Ambrisentan is contraindicated in patients with hypersensitivity to the active substance, to soya or any of the excipients.
Ambrisentan is contraindicated in pregnancy. Animal studies have shown that ambrisentan is teratogenic. There is no experience in humans. Women receiving ambrisentan must be advised of the risk of foetal harm and alternative therapy initiated if pregnancy occurs. It is not known whether ambrisentan is excreted in human breast milk. The excretion of ambrisentan in milk has not been studied in animals. Therefore breast-feeding is contraindicated in patients taking ambrisentan.
In males, the development of testicular tubular atrophy in male animals has been linked to the chronic administration of endothelin receptor antagonists (ERAs), including ambrisentan. Ambrisentan has not been studied in a sufficient number of patients to establish the benefit/risk balance in WHO functional class I PAH.
Liver function abnormalities have been associated with PAH. Cases consistent with autoimmune hepatitis, including possible exacerbation of underlying autoimmune hepatitis, hepatic injury and hepatic enzyme elevations potentially related to therapy have been observed with ambrisentan. Therefore hepatic aminotransferases (ALT and AST) should be evaluated prior to initiation of ambrisentan and treatment should not be initiated in patients with baseline values of ALT and/or AST>3xULN.
Peripheral oedema, fluid retention and headache (including sinus headache, migraine) were the most common adverse reactions observed with ambrisentan.
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Cautionary statement regarding forward-looking statements
GSK cautions investors that any forward-looking statements or projections made by GSK, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Such factors include, but are not limited to, those described under Item 3.D 'Risk factors' in the company's Annual Report on Form 20-F for 2014.
