AstraZeneca's Tezspire (tezepelumab) has been approved in Japan for the treatment of bronchial asthma in patients with severe or refractory disease in whom asthma symptoms cannot be controlled with mid- or high-dose inhaled corticosteroids and other long-term maintenance therapies.1
The approval by the Japanese Ministry of Health, Labour and Welfare (MHLW) was based on efficacy and safety results from the PATHFINDER clinical trial programme. The application included results from the pivotal NAVIGATOR Phase III trial in which Tezspire demonstrated superiority across every primary and key secondary endpoint in patients with severe asthma, compared to placebo, when added to standard therapy.2
Tezspire is the first and only biologic for severe asthma that acts at the top of the inflammatory cascade by blocking thymic stromal lymphopoietin (TSLP), an epithelial cytokine.2-5 Tezspire consistently and significantly reduced asthma exacerbations across the PATHWAY Phase II and NAVIGATOR Phase III clinical trials which included a broad population of severe asthma patients irrespective of key biomarkers, including blood eosinophil counts, allergic status and fractional exhaled nitric oxide (FeNO).2,3
Hironori Sagara, Professor and Chairman of the Department of Medicine Division of Respiratory Medicine & Allergology, Showa University School of Medicine, Tokyo, Japan, said: "Severe asthma is a debilitating disease, and many patients continue to experience frequent exacerbations and a significantly reduced quality of life despite recent advances in treatment. Across clinical trials, Tezspire has demonstrated significant results in a broad population of severe asthma patients, and with this approval, physicians can now offer patients in Japan a meaningful new treatment option."
Mene Pangalos, Executive Vice President, BioPharmaceuticals R&D, AstraZeneca, said: "Tezspire is the first and only biologic approved by the Japanese Ministry of Health, Labour and Welfare that has been shown to consistently and significantly reduce attacks in exacerbation trials in a broad population of severe asthma patients irrespective of biomarker levels. Tezspire has the potential to improve outcomes for many patients with severe asthma and we are working to make this important medicine available in Japan as quickly as possible."
In clinical studies, the most common adverse reactions in patients who received Tezspire were pharyngitis, arthralgia, rash and injection site reactions.1 The results from the NOZOMI Phase III long-term safety trial of Tezspire in Japanese patients were published in The Journal of Asthma in June 2022.
Results from the NAVIGATOR Phase III trial were published in The New England Journal of Medicine in May 2021.
Tezspire is approved in the US, the EU and other countries for the treatment of severe asthma. Other regulatory reviews evaluating Tezspire are ongoing in several markets around the world.
Notes
Severe asthma
Asthma is a heterogeneous disease affecting an estimated 339 million people worldwide.6 Up to 10% of asthma patients have severe asthma.7,8 Despite the use of inhaled asthma controller medicine, currently available biologic therapies and oral corticosteroids (OCS), many severe asthma patients remain uncontrolled.7-9 Due to the complexity of severe asthma, many patients have unclear or multiple drivers of inflammation and may not qualify for or respond well to a current biologic medicine.8-11
Severe, uncontrolled asthma is debilitating with patients experiencing frequent exacerbations, significant limitations on lung function and a reduced quality of life.7,8,12 Patients with severe asthma are at an increased risk of mortality and compared to patients with persistent asthma have twice the risk of asthma-related hospitalisations.13-15 There is also a significant socio-economic burden, with these patients accounting for approximately 50% of asthma-related costs.16
Clinical trials
In addition to the Phase IIb PATHWAY trial, the PATHFINDER programme included two Phase III trials, NAVIGATOR2,17 and SOURCE.18,19 The programme also includes additional mechanistic and long-term safety trials.20,21
NAVIGATOR is a Phase III, randomised, double-blinded, placebo-controlled trial in adults (18-80 years old) and adolescents (12-17 years old) with severe, uncontrolled asthma, who were receiving standard of care (SoC). SoC was treatment with medium- or high-dose inhaled corticosteroids plus at least one additional controller medication with or without daily OCS treatment. The trial population included approximately equal proportions of patients with high (≥300 cells per microlitre) and low (2
The primary efficacy endpoint was the annualised asthma exacerbation rate (AAER) during the 52-week treatment period. Key secondary endpoints included the effect of Tezspire on lung function, asthma control and health-related quality of life.2
As part of prespecified analyses, the AAER over 52 weeks was also assessed in patients grouped by baseline blood eosinophil count, FeNO level and serum specific immunoglobin E (IgE) status (perennial aeroallergen sensitivity positive or negative).2 These are inflammatory biomarkers used by clinicians to inform treatment options and involve tests analysing a patient's blood (eosinophils/IgE) and exhaled air (FeNO).
There were no clinically meaningful differences in safety results between the Tezspire and placebo groups in the NAVIGATOR trial.2 The most frequently reported adverse events for Tezspire were nasopharyngitis, upper respiratory tract infection and headache.2
NAVIGATOR is the first Phase III trial to show benefit in severe asthma irrespective of eosinophils by targeting TSLP.2 These results support the FDA Breakthrough Therapy Designation granted to Tezspire in September 2018 for patients with severe asthma, without an eosinophilic phenotype. In July 2021, Tezspire was the first and only biologic to be granted Priority Review in the US for the treatment of asthma by the FDA.22
Tezspire
Tezspire (tezepelumab) is being developed by AstraZeneca in collaboration with Amgen as a first-in-class human monoclonal antibody that inhibits the action of TSLP, a key epithelial cytokine that sits at the top of multiple inflammatory cascades and is critical in the initiation and persistence of allergic, eosinophilic and other types of airway inflammation associated with severe asthma, including airway hyperresponsiveness.3,4 TSLP is released in response to multiple triggers associated with asthma exacerbations, including allergens, viruses and other airborne particles.3,4 Expression of TSLP is increased in the airways of patients with asthma and has been correlated with disease severity.3,5 Blocking TSLP may prevent the release of pro-inflammatory cytokines by immune cells, resulting in the prevention of asthma exacerbations and improved asthma control.2,3,5 Tezspire acts at the top of the inflammation cascade and has the potential to help address a broad population of severe asthma patients irrespective of biomarker levels.2,3
Tezspire is approved in the US for the add-on maintenance treatment of adult and paediatric patients aged 12 years and older with severe asthma.27Tezspire is also in development for other potential indications including chronic obstructive pulmonary disease, chronic rhinosinusitis with nasal polyps, chronic spontaneous urticaria and eosinophilic esophagitis (EoE). In October 2021, tezepelumab was granted Orphan Drug Designation by the FDA for the treatment of EoE.
Amgen collaboration
In 2020, Amgen and AstraZeneca updated a 2012 collaboration agreement for Tezspire. Both companies will continue to share costs and profits equally after payment by AstraZeneca of a mid single-digit inventor royalty to Amgen. AstraZeneca continues to lead development and Amgen continues to lead manufacturing. All aspects of the collaboration are under the oversight of joint governing bodies. Under the amended agreement, Amgen and AstraZeneca will jointly commercialise Tezspire in North America. Amgen will record product sales in the US, with AZ recording its share of US profits as Collaboration Revenue. Outside of the US, AstraZeneca will record product sales, with Amgen recording profit share as Other/Collaboration revenue.
AstraZeneca in Respiratory & Immunology
Respiratory & Immunology, part of BioPharmaceuticals, is one of AstraZeneca's main disease areas and is a key growth driver for the Company.
AstraZeneca is an established leader in respiratory care with a 50-year heritage. The Company aims to transform the treatment of asthma and COPD by focusing on earlier biology-led treatment, eliminating preventable asthma attacks, and removing COPD as a top-three leading cause of death. The Company's early respiratory research is focused on emerging science involving immune mechanisms, lung damage and abnormal cell-repair processes in disease and neuronal dysfunction.
With common pathways and underlying disease drivers across respiratory and immunology, AstraZeneca is following the science from chronic lung diseases to immunology-driven disease areas. The Company's growing presence in immunology is focused on five mid- to late-stage franchises with multi-disease potential, in areas including rheumatology (including systemic lupus erythematosus), dermatology, gastroenterology, and systemic eosinophilic-driven diseases. AstraZeneca's ambition in Respiratory & Immunology is to achieve disease modification and durable remission for millions of patients worldwide.
AstraZeneca
AstraZeneca (LSE/STO/Nasdaq: AZN) is a global, science-led biopharmaceutical company that focuses on the discovery, development, and commercialisation of prescription medicines in Oncology, Rare Diseases, and BioPharmaceuticals, including Cardiovascular, Renal & Metabolism, and Respiratory & Immunology. Based in Cambridge, UK, AstraZeneca operates in over 100 countries and its innovative medicines are used by millions of patients worldwide. Please visit astrazeneca.com and follow the Company on Twitter @AstraZeneca
