62% of patients stopped OCS use in largest ever steroid sparing trial in severe asthma
High-level results from the PONENTE Phase IIIb open-label trial showed Fasenra (benralizumab) eliminated the use of maintenance oral corticosteroids (OCS) in OCS-dependent asthma patients with a broad range of blood eosinophil counts.
Severe asthma is an often debilitating condition affecting approximately 34 million people worldwide.1,2 More than one-third of these patients currently use chronic or intermittent OCS on top of other therapies to control their symptoms and exacerbations.3,4 However, frequent or chronic OCS use can lead to serious adverse effects.5-7
On the first primary endpoint, 62% of patients achieved complete elimination of daily OCS use. On the second primary endpoint, 81% of patients achieved complete elimination or were able to reduce their daily OCS dose to 5mg or less when further reduction was not possible due to adrenal insufficiency. Both primary endpoints were sustained for at least four weeks while maintaining asthma control. PONENTE included nearly 600 patients in Europe, North America, South America, and Taiwan.
Professor Andrew Menzies-Gow, Director of the Lung Division, Royal Brompton Hospital, London, UK, the principal investigator of the PONENTE trial, said: “These exciting results demonstrate Fasenra’s impact in eliminating or reducing oral corticosteroid use. The reductions achieved with the personalised oral corticosteroid tapering schedule are particularly important because adrenal insufficiency can be a barrier to safe and meaningful oral corticosteroid reduction. These data should inform severe asthma treatment guidelines and strengthen physicians’ confidence to more safely eliminate chronic oral corticosteroid use in their patients.”
Mene Pangalos, Executive Vice President, BioPharmaceuticals R&D, said: "Around 13.5 million people worldwide with severe asthma currently rely on oral corticosteroids to control exacerbations and prevent hospitalisations. However, over-reliance on oral corticosteroids can also cause significant health risks for patients, as well as additional strain on health systems. These data further support Fasenra’s clinical profile in eliminating oral corticosteroid use across a broader population of severe asthma patients.”
The trial expands on OCS-sparing data previously seen in the ZONDA Phase III trial by using a faster steroid tapering schedule in patients who did not experience adrenal insufficiency to reduce OCS use from higher doses. The PONENTE trial also has a longer maintenance phase of approximately 24–32 weeks, which shows more durable OCS reduction and asthma control than was shown in ZONDA and all other published trials for biologic medicines.8,9 The safety profile and tolerability of Fasenra in PONENTE were consistent with the known profile of the medicine. The trial results will be presented at a forthcoming medical meeting.
Fasenra is currently approved as an add-on maintenance treatment for severe eosinophilic asthma in the US, EU, Japan and other countries, and is approved for self-administration in the US, EU and other countries. In January 2020, AstraZeneca announced Fasenra is being evaluated in eight eosinophil-driven diseases beyond severe asthma.
Asthma affects approximately 339 million individuals worldwide.1,2 Approximately 10% of asthma patients have severe asthma, which may be uncontrolled despite high dosages of standard of care asthma controller medicines and can require the long-term use of OCS.2,10,11 Severe, uncontrolled asthma is debilitating and potentially fatal, with patients experiencing frequent exacerbations and significant limitations on lung function and health-related quality of life.2,11,12 Severe, uncontrolled asthma has a greater risk of mortality than severe asthma.10 70% or more of people with severe asthma have elevated counts of eosinophils, white blood cells that are a normal part of the immune system and can drive airway inflammation in some patients.10,11,13,14
Severe, uncontrolled asthma can lead to a dependence on OCS, with cumulative steroid exposure leading to serious short- and long-term adverse effects including weight gain, diabetes, osteoporosis, glaucoma, anxiety, depression, cardiovascular disease immunosuppression and adrenal insufficiency.5-7 OCS over-reliance can also place additional strain on health systems; a UK analysis identified OCS-dependent asthma patients have an average of 43% greater associated direct healthcare treatment costs than patients not receiving maintenance OCS.15
Adrenal insufficiency is a condition in which the adrenal glands do not produce adequate amounts of steroid hormones.16,17 Steroid hormones are important to help control metabolism, inflammation, immune functions and salt and water balance, among other critical functions.17 Adrenal insufficiency can develop as a result of taking chronic OCS and may persist following steroid reduction or discontinuation, potentially causing serious clinical consequences including shock, seizure, coma and even death in cases of an acute adrenal crisis.16,17
PONENTE is a multicentre, open-label, single-arm, Phase IIIb trial to evaluate the efficacy and safety of reducing daily OCS use after initiation of 30 mg dose of Fasenra administered subcutaneously (SC) in adult patients with severe eosinophilic asthma on high-dose inhaled corticosteroids (ICS) plus long-acting beta2-agonist (LABA) and long-term use of OCS therapy with or without additional asthma controller(s). Patients recruited into the study had been on maintenance OCS dose of ≥5 mg of prednisone for at least three months and had a baseline peripheral blood eosinophil count of ≥150 cells/μL or baseline eosinophils below 150 cells/μL with a documented eosinophil count of ≥300 cells/μL in the past 12 months. The treatment period consisted of a four-week induction phase with no OCS adjustments, a variable OCS tapering phase and an ongoing 24-32-week maintenance phase.8,18
The primary outcome measures of the trial were the proportion of patients achieving a 100% reduction in daily OCS dose and the proportion of patients achieving a 100% reduction or a daily OCS dose of ≤5 mg if the reason for no further OCS reduction was adrenal insufficiency, both sustained for at least four weeks without worsening of asthma.8,18
Compared to published trials, PONENTE has a personalised OCS tapering schedule that allows for more rapid OCS tapering from high OCS doses, followed by an assessment of the adrenal function as part of decision-making to manage the risk of adrenal insufficiency. PONENTE also has a significantly longer maintenance phase, (approximately 24-32 weeks versus four weeks for published trials of other biologics) allowing assessment of the durability of OCS reduction.8,18
Fasenra (benralizumab) is a monoclonal antibody that binds directly to IL-5 receptor alpha on eosinophils and attracts natural killer cells to induce rapid and near-complete depletion of eosinophils via apoptosis (programmed cell death).19,20
Fasenra is in development for other eosinophilic diseases and chronic obstructive pulmonary disease.21-25 The Food and Drug Administration granted Orphan Drug Designation for Fasenra for the treatment of eosinophilic granulomatosis with polyangiitis in 2018, and hypereosinophilic syndrome and eosinophilic oesophagitis in 2019.
Fasenra was developed by AstraZeneca and is in-licensed from BioWa, Inc., a wholly-owned subsidiary of Kyowa Kirin Co., Ltd., Japan.
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