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Takeda Intends to Rapidly Initiate the First Global Phase 3 Trials of TAK-861, an Oral Orexin Agonist, in Narcolepsy Type 1 in First Half of Fiscal Year 2024

- TAK-861 Was Found to be Generally Safe and Well-Tolerated

- Results Will be Presented at an Upcoming Scientific Congress

Narcolepsy is a chronic, rare neurological disorder of central hypersomnolence with significant unmet need despite multiple approved therapies. It is currently classified into two different types: narcolepsy type 1 (NT1) caused by significant loss of orexin neurons with resulting lack of orexin, and narcolepsy type 2 (NT2) where orexin levels are generally normal. Stimulating the orexin receptor 2 in NT1 patients targets the underlying pathophysiology of the disease to restore orexin signaling. Two separate Phase 2b studies were conducted in NT1 (NCT05687903) and NT2 (NCT05687916).

The NT1 trial TAK-861-2001 evaluating TAK-861 in 112 patients demonstrated statistically significant and clinically meaningful improvement in objective and subjective measures of wakefulness compared to placebo at week 8 including on the primary endpoint Maintenance of Wakefulness Test (MWT) (p < 0.001). Improvements in key secondary endpoints including Epworth Sleepiness Scale (ESS) and Weekly Cataplexy Rate (WCR) were statistically significant and clinically meaningful, consistent with the primary endpoint. The majority of patients who completed the trial entered a long-term extension study. Based on these results, and in consultation with global health authorities, Takeda plans to initiate global Phase 3 trials of TAK-861 in NT1 rapidly in the first half of its fiscal year 2024.

At this time, Takeda does not plan to advance TAK-861 in NT2. Data are being further analyzed to determine next steps in orexin normal populations. Takeda is progressing multiple orexin agonists in patient populations with normal levels of orexin neuropeptides such as NT2 and other indications where orexin biology is implicated.

TAK-861 was generally safe and well tolerated in both trials. No treatment related serious adverse events were reported. In addition, no cases of hepatotoxicity or visual disturbances were reported in the Phase 2b trials or in the ongoing TAK-861 long-term extension trial.

"We are thrilled to announce these clear and compelling results from the TAK-861 trial in narcolepsy type 1 that allows us to rapidly initiate Phase 3 trials this year as we work to deliver a medicine to patients that could address the underlying pathophysiology of the disease," said Sarah Sheikh M.Sc., B.M., B.Ch, MRCP, Head, Neuroscience Therapeutic Area Unit and Head, Global Development at Takeda. "Takeda thanks the patients, caregivers and investigators who participated in our orexin agonist trials. We will continue to apply our deep and growing understanding of orexin biology as we work to develop and deliver transformative treatments to people across a range of indications who could benefit from this mechanism."

Results from both trials will be presented at an upcoming scientific congress.

Results from the Phase 2b trials have no impact on the full year consolidated reported forecast for the fiscal year ending March 31, 2024 (Fiscal Year 2023).

About Takeda

Takeda is focused on creating better health for people and a brighter future for the world. We aim to discover and deliver life-transforming treatments in our core therapeutic and business areas, including gastrointestinal and inflammation, rare diseases, plasma-derived therapies, oncology, neuroscience and vaccines. Together with our partners, we aim to improve the patient experience and advance a new frontier of treatment options through our dynamic and diverse pipeline. As a leading values-based, R&D-driven biopharmaceutical company headquartered in Japan, we are guided by our commitment to patients, our people and the planet. Our employees in approximately 80 countries and regions are driven by our purpose and are grounded in the values that have defined us for more than two centuries. For more information, visit www.takeda.com.

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