THOUSAND OAKS, Calif.,?Feb. 26, 2021?/PRNewswire/ --?Amgen?(NASDAQ:AMGN) and AstraZeneca today announced positive full results from the pivotal NAVIGATOR Phase 3 trial, which showed the potential of tezepelumab to be a first-in-class medicine in severe asthma. When added to standard of care (SoC), tezepelumab demonstrated a statistically significant and clinically meaningful reduction in the annualized asthma exacerbation rate (AAER) in patients with severe, uncontrolled asthma, compared to placebo.¹?The results were presented at the?American Academy of Asthma Allergy & Immunology?Annual Meeting. NAVIGATOR is a pivotal Phase 3 trial that will form the basis of regulatory filing. Tezepelumab, a potential first-in-class medicine, when added to standard of care (SoC) achieved a 56% reduction (p<0.001) in AAER over 52 weeks in the overall patient population, compared to placebo when added to SoC.²?Tezepelumab is the only biologic to consistently and significantly reduce AAER in a broad population of severe asthma patients irrespective of the baseline eosinophil counts across Phase 2 and Phase 3 clinical trials.^2-10 "We believe the full results of the NAVIGATOR trial are a breakthrough for the millions of people living with severe asthma," said?David M. Reese, M.D., executive vice president of Research and Development at?Amgen. "The reduction in exacerbation rates tezepelumab demonstrated, regardless of eosinophil or allergic status, is impressive. We are thrilled with these results and what they could mean for patients suffering with severe asthma." In a pre-specified analysis of the subgroup of patients with baseline eosinophil counts less than 300 cells per microliter, tezepelumab achieved a statistically significant and clinically meaningful 41% reduction (p<0.001) in AAER.²?Importantly, clinically meaningful reductions in AAER were also observed in two additional subgroups: a 39% reduction in patients with baseline eosinophil counts less than 150 cells per microliter and a 70% reduction in patients with greater than or equal to 300 cells per microliter.² Additionally, clinically meaningful reductions in AAER compared to placebo were observed in the tezepelumab-treated patients irrespective of allergy status and fractional exhaled nitric oxide (FeNO) level, biomarkers used by clinicians to inform treatment options.² "These are ground-breaking results for the many patients with severe asthma who continue to face debilitating symptoms despite receiving standard of care inhaled medicines and currently approved biologics," said Professor?Andrew Menzies-Gow, director of the Lung Division,?Royal Brompton Hospital,?London, UK, and principal investigator of the NAVIGATOR Phase 3 trial. "Tezepelumab has the potential to transform treatment for a broad population of patients with severe asthma regardless of their type of inflammation, including those with and without an eosinophilic phenotype." Tezepelumab also demonstrated statistically significant improvements in every key secondary endpoint compared to placebo, including lung function measurements, asthma control, and health-related quality of life.² There were no clinically meaningful differences in safety results between the tezepelumab and placebo groups. The most frequently reported adverse events were nasopharyngitis, upper respiratory tract infection and headache.² Tezepelumab blocks the action of thymic stromal lymphopoietin (TSLP), an epithelial cytokine that plays a key role across the spectrum of asthma inflammation.^3,10?NAVIGATOR is the first Phase 3 trial to show benefit in severe asthma by targeting TSLP.² The statistically significant and clinically meaningful exacerbation rate reductions demonstrated with tezepelumab in patients with baseline eosinophil counts less than 300 cells per microliter support the?U.S.?Food and Drug Administration Breakthrough Therapy Designation?granted to tezepelumab in?September 2018?for patients with severe asthma, without an eosinophilic phenotype.^2-3?Tezepelumab is being developed by AstraZeneca in collaboration with?Amgen?(see AstraZeneca and?Amgen?collaboration below). About Severe Asthma Asthma is a complex and heterogeneous disease affecting an estimated 339 million people worldwide.^11,12?Approximately 10% of asthma patients have severe asthma.^11,12?Globally, there are approximately 2.5 million severe asthma patients who are uncontrolled or biologic eligible, with approximately 1 million in the?U.S.?Many severe asthma patients have an inadequate response to currently available biologics and oral corticosteroids and thus fail to achieve asthma control.^11-13?Severe, uncontrolled asthma is debilitating with patients experiencing frequent exacerbations, significant limitations on lung function and a reduced quality of life.^11-13?Patients with severe asthma?have?twice the risk?of asthma-related hospitalizations.^14,15?There is also a significant socio-economic burden, with these patients accounting for 50% of asthma-related costs.¹⁶ Multiple inflammatory pathways are involved in the pathogenesis of asthma.^17,18,19?Eosinophilic asthma, and more broadly, T2 inflammation-driven asthma, accounts for about two-thirds of patients with severe asthma.^19?These patients are typically characterized as having elevated levels of inflammatory biomarkers, including blood eosinophils, serum IgE and fractional exhaled nitric oxide (FeNO).^20,21?However, many patients do not fit the criteria for eosinophilic or allergic asthma, may have unclear or multiple drivers of inflammation, and may not qualify for or respond well to a current biologic medicine.²¹ NAVIGATOR and the PATHFINDER Clinical Trial Program Building on the positive Phase 2b PATHWAY trial, the Phase 3 PATHFINDER program included two trials, NAVIGATOR and SOURCE.^22-25?The program includes additional planned mechanistic and long-term safety trials. NAVIGATOR is a Phase 3, randomized, double-blinded, placebo-controlled trial in 1,061 adults (18?80 years old) and adolescents (12?17 years old) with severe, uncontrolled asthma, who were receiving treatment with medium- or high-dose ICS plus at least one additional controller medication with or without OCS. NAVIGATOR met the primary endpoint with tezepelumab added to SoC demonstrating a statistically significant and clinically meaningful reduction in the AAER over 52 weeks in the overall patient population, compared to placebo added to SoC. The trial also met the primary endpoint in the subgroup of patients with baseline eosinophil counts less than 300 cells per microliter, with tezepelumab demonstrating a statistically significant and clinically meaningful reduction in AAER in that patient population. Similar reductions in AAER were observed in the subgroup of patients with baseline eosinophil counts less than 150 cells per microliter.²⁵ SOURCE is a Phase 3 multicenter, randomized, double-blinded, parallel-group, placebo-controlled trial for 48 weeks in adult patients with severe asthma who require continuous treatment with ICS plus long-acting beta2-agonists (LABA), and chronic treatment with maintenance OCS therapy.^23??In the trial, patients were randomized to receive tezepelumab 210 mg every four weeks or placebo as add-on therapy, with patients maintained on their currently prescribed ICS plus LABA, with or without other asthma controller therapy.²³ Patients who participated in the NAVIGATOR and SOURCE trials were eligible to continue in DESTINATION, a Phase 3 extension trial assessing long term safety and efficacy.²⁶ About Tezepelumab Tezepelumab is an investigational, potential first-in-class human monoclonal antibody that works on the primary source of inflammation: the airway epithelium, which is the first point of contact for viruses, allergens, pollutants and other environmental insults. Specifically, tezepelumab targets and blocks thymic stromal lymphopoietin (TSLP), a key epithelial cytokine that sits at the top of multiple inflammatory cascades and initiates an overreactive immune response to allergic, eosinophilic and other types of airway inflammation associated with severe asthma.^3,9,22 TSLP is released in response to multiple triggers associated with asthma exacerbations, including allergens, viruses and other airborne particles.^?3,9?Expression of TSLP is increased in the airways of patients with asthma and has been correlated with disease severity.^3,22?Blocking TSLP may prevent the release of pro-inflammatory cytokines by immune cells, resulting in the prevention of asthma exacerbations and improved asthma control.^?3,22?By working at the top of the cascade, tezepelumab helps stop inflammation at the source and has the potential to treat a broad population of severe asthma patients.^3,22 Amgen?and AstraZeneca Collaboration In 2020,?Amgen?and AstraZeneca updated the 2012 collaboration agreement for tezepelumab. Both companies will continue to share costs and profits equally after payment by AstraZeneca of a mid-single-digit 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 in?North America,?Amgen?and AstraZeneca will jointly commercialize tezepelumab.?Amgen?will record sales in the?U.S.?and AstraZeneca will record sales in?Canada. Outside the?U.S.,?Amgen?will record sales as collaboration revenue. Amgen?Inflammation Amgen?brings therapies to millions of people with inflammatory diseases, with a focus on serving unmet patient needs. For those with debilitating moderate to severe rheumatoid arthritis, psoriatic arthritis, moderate to severe plaque psoriasis, ankylosing spondylitis, asthma, and other chronic conditions, the suffering and needs are severe. Complex diseases of inflammation have defied simple solutions, and the breadth of inflammatory disease and the burden patients bear is not well understood. For more than two decades,?Amgen?has been committed to advancing the science and the understanding around inflammation to address the unmet patient needs that exist and expanding our portfolio. We lead with science through discovery research that is disease-agnostic and biology-first, modality-second. In doing so, we have introduced and evolved novel therapies that have changed the lives of patients. Our commitment to patients is reflected not only in where we have succeeded, but in where we have failed and opened new doors. Throughout, we have remained dedicated to the principle of leading with science, pursuing where pathways and promising discoveries in inflammation take us, and not relenting until innovative solutions for patients are found. It's a commitment that extends beyond introducing novel therapies. We are focused on improving the entire patient journey. About?Amgen? Amgen?is committed to unlocking the potential of biology for patients suffering from serious illnesses by discovering, developing, manufacturing and delivering innovative human therapeutics. This approach begins by using tools like advanced human genetics to unravel the complexities of disease and understand the fundamentals of human biology. Amgen?focuses on areas of high unmet medical need and leverages its expertise to strive for solutions that improve health outcomes and dramatically improve people's lives. A biotechnology pioneer since 1980,?Amgen?has grown to be?one of?the world's?leading?independent biotechnology companies, has reached millions of patients around the world and is developing a pipeline of medicines with breakaway potential. For more information, visit?www.amgen.com?and follow us on?www.twitter.com/amgen. Amgen?Forward-Looking Statements This news release contains forward-looking statements that are based on the current expectations and beliefs of?Amgen. All statements, other than statements of historical fact, are statements that could be deemed forward-looking statements, including any statements on the outcome, benefits and synergies of collaborations, or potential collaborations, with any other company, including BeiGene, Ltd. or any collaboration to manufacture therapeutic antibodies against COVID-19, or the Otezla? 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The complexity of the human body cannot be perfectly, or sometimes, even adequately modeled by computer or cell culture systems or animal models. The length of time that it takes for?Amgen?to complete clinical trials and obtain regulatory approval for product marketing has in the past varied and?Amgen?expects similar variability in the future. Even when clinical trials are successful, regulatory authorities may question the sufficiency for approval of the trial endpoints?Amgen?has selected.?Amgen?develops product candidates internally and through licensing collaborations, partnerships and joint ventures. Product candidates that are derived from relationships may be subject to disputes between the parties or may prove to be not as effective or as safe as?Amgen?may have believed at the time of entering into such relationship. Also,?Amgen?or others could identify safety, side effects or manufacturing problems with its products, including its devices, after they are on the market. Amgen's results may be affected by its ability to successfully market both new and existing products domestically and internationally, clinical and regulatory developments involving current and future products, sales growth of recently launched products, competition from other products including biosimilars, difficulties or delays in manufacturing its products and global economic conditions. In addition, sales of?Amgen's products are affected by pricing pressure, political and public scrutiny and reimbursement policies imposed by third-party payers, including governments, private insurance plans and managed care providers and may be affected by regulatory, clinical and guideline developments and domestic and international trends toward managed care and healthcare cost containment. 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An outbreak of disease or similar public health threat, such as COVID-19, and the public and governmental effort to mitigate against the spread of such disease, could have a significant adverse effect on the supply of materials? for?Amgen's manufacturing? activities,? the? distribution? of?Amgen's products,? the commercialization of?Amgen's product candidates, and?Amgen's clinical trial operations, and any such events may have a material adverse effect on?Amgen's product development, product sales, business and results of operations.?Amgen?relies on collaborations with third parties for the development of some of its product candidates and for the commercialization and sales of some of its commercial products. In addition,?Amgen?competes with other companies with respect to many of its marketed products as well as for the discovery and development of new products. Further, some raw materials, medical devices and component parts for?Amgen's products are supplied by sole third-party suppliers. Certain of?Amgen's distributors, customers and payers have substantial purchasing leverage in their dealings with?Amgen. The discovery of significant problems with a product similar to one of?Amgen's products that implicate an entire class of products could have a material adverse effect on sales of the affected products and on its business and results of operations.?Amgen's efforts to collaborate with or acquire other companies, products or technology, and to integrate the operations of companies or to support the products or technology?Amgen?has acquired, may not be successful. A breakdown, cyberattack or information security breach could compromise the confidentiality, integrity and availability of?Amgen's systems and?Amgen's data.?Amgen's stock price may be volatile and may be affected by a number of events. Global economic conditions may magnify certain risks that affect our business.?Amgen's business performance could affect or limit the ability of the?Amgen?Board of Directors to declare a dividend or its ability to pay a dividend or repurchase its common stock.?Amgen?may not be able to access the capital and credit markets on terms that are favorable to it, or at all. The scientific information discussed in this news release related to?Amgen's product candidates is preliminary and investigative. Such product candidates are not approved by the?U.S. Food and Drug Administration, and no conclusions can or should be drawn regarding the safety or effectiveness of the product candidates. Further, any scientific information discussed in this news release relating to new indications for?Amgen's products is preliminary and investigative and is not part of the labeling approved by the?U.S. Food and Drug Administration?for the products. The products are not approved for the investigational use(s) discussed in this news release, and no conclusions can or should be drawn regarding the safety or effectiveness of the products for these uses. CONTACT:?Amgen, Thousand Oaks Megan Fox, 805-447-1423 (media) Trish Rowland, 805-447-5631(media) Arvind Sood, 805-447-1060 (investors) References

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