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Chugai’s Enspryng (Satralizumab) Approved by European Commission as First At-home Subcutaneous Treatment for Neuromyelitis Optica Spectrum Disorder (NMOSD)

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Chugai Pharmaceutical Co., Ltd. (TOKYO: 4519) announced today that Roche has been granted Marketing Authorization from the European Commission for the pH-dependent binding humanized anti-IL-6 receptor monoclonal antibody Enspryng® (satralizumab), created by Chugai, as the first subcutaneous treatment option for adults and adolescents from 12 years of age living with anti-aquaporin-4 antibody (AQP4-IgG) seropositive neuromyelitis optica spectrum disorder (NMOSD), as a monotherapy or in combination with immunosuppressive therapy (IST). Enspryng is the first treatment approved in the EU for adolescents from 12 years of age with NMOSD.

“We are very pleased that Enspryng is now approved in the EU as the first subcutaneous treatment for people with AQP4-IgG seropositive NMOSD, with the option to be treated at home,” said Chugai’s President and CEO, Dr. Osamu Okuda. “Enspryng is the first approved therapeutic antibody for which our proprietary recycling antibody technology was applied. We are confident that Enspryng will meaningfully contribute to improving the treatment of people with NMOSD, by fitting into their day-to-day lives.”

The efficacy and safety of Enspryng has been evaluated in large clinical trials representative of the real-world population of people with NMOSD, including those who have only experienced a single NMOSD attack and adolescents. The approval by the European Commission is based on the results from two global phase III clinical studies in people with NMOSD: SAkuraSky Study (NCT02028884) and SAkuraStar Study (NCT02073279). SAkuraSky evaluated Enspryng in combination with baseline immunosuppressive treatment, and SAkuraStar assessed monotherapy.

Enspryng is designed to prevent NMOSD relapses by inhibiting IL-6 signal signaling, which is a key driver in NMOSD. Enspryng is currently approved in 54 countries including Japan, the United States and EU countries.

The impact on the consolidated financials for the fiscal year ending December 2021 of Chugai is expected to be negligible.

*Self-administration is not covered in Japan at this time
**Subcutaneous administration at 2-week intervals up to the fourth week of treatment and at 4-week intervals thereafter

[Reference]

New Data of Chugai’s Enspryng (Satralizumab) on Risk and Severity of Relapse in Neuromyelitis Optica Spectrum Disorder (NMOSD) (September 10, 2020)
https://www.chugai-pharm.co.jp/english/news/detail/20200910150000_765.html

About neuromyelitis optica spectrum disorder (NMOSD)1

NMOSD is an autoimmune disease of the central nervous system characterized by inflammatory lesions in the optic nerves and spinal cord, and causes a continual and significant decrease in quality of life due to permanent neurological disability. Patients with NMOSD frequently experience a relapsing disease course with repeated attacks leading to accumulating neurological damage and disability. Symptoms may include visual impairment, motor disability, pain leading to decreased quality of life. In some cases, attacks of NMOSD result in death. Aquaporin-4 antibodies (AQP4-IgG), pathogenic antibodies, are detected in around 70-80% of NMOSD people. AQP4-IgG is known to target and damage a specific central nervous cell type called astrocytes, resulting in inflammatory demyelinating lesions of the optic nerve(s), spinal cord and brain 2-5. The inflammatory cytokine IL-6 is now emerging as an important factor in NMOSD pathogenesis 6-10.

Trademarks used or mentioned in this release are protected by law.

Sources
1. Neuromyelitis optica spectrum disorder (NMOSD) Online. https://nmosd-online.jp/ Accessed June 2021. (Japanese only)
2. Jarius S, Ruprecht K, Wildemann B et al. Contrasting disease patterns in seropositive and seronegative neuromyelitis optica: A multicentre study of 175 patients. J Neuroinflammation 2012;9:14.
3. Lennon VA, Wingerchuk DM, Kryzer TJ et al. A serum autoantibody marker of neuromyelitis optica: distinction from multiple sclerosis. Lancet 2004;364:2106-12.
4. Marignier R, Bernard-Valnet R, Giraudon P et al. Aquaporin-4 antibody-negative neuromyelitis optica: Distinct assay sensitivity-dependent entity. Neurology 2013;80:2194-200.
5. Takahashi T, Fujihara K, Nakashima I et al. Anti-aquaporin-4 antibody is involved in the pathogenesis of NMO: a study on antibody titre. Brain 2007;130:1235-43.
6. Chihara N, Aranami T, Sato W et al. Interleukin 6 signaling promotes anti-aquaporin 4 autoantibody production from plasmablasts in neuromyelitis optica. Proc Natl Acad Sci USA 2011;108:3701-6.
7. Kimura A, Kishimoto T. IL-6: regulator of Treg/Th17 balance. Eur J Immunol 2010;40:1830-5.
8. Lin J, Li X, Xia J. Th17 cells in neuromyelitis optica spectrum disorder: a review. Int J Neurosci2016;126:1051-60.
9. Takeshita Y, Obermeier B, Cotleur AC, et al. Effects of neuromyelitis optica-IgG at the blood-brain barrier in vitro. Neurol Neuroimmunol Neuroinflamm. 2016;4(1):e311.
10. Obermeier B, Daneman R, Ransohoff RM. Development, maintenance and disruption of the blood-brain barrier. Nat Med 2013;19:1584-96.

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Contact information

For Media
Chugai Pharmaceutical Co., Ltd.
Media Relations Group, Corporate Communications Dept.,
Tomoko Shimizu
Tel: +81-3-3273-0881
E-mail: pr@chugai-pharm.co.jp

For US media
Chugai Pharma USA Inc.
Casey Astringer
Tel: +1-908-516-1350
E-mail: pr@chugai-pharm.com

For European media
Chugai Pharma U.K. Ltd.
Tania Richards
Tel: +44-20-8987-5680
E-mail: pr@chugai.eu

For Taiwanese media
Chugai Pharma Taiwan Ltd.
Susan Chou
Tel: +886-2-2715-2000
E-mail: pr@chugai.com.tw

For Investors
Chugai Pharmaceutical Co., Ltd.
Investor Relations Group, Corporate Communications Dept.,
Takayuki Sakurai
Tel: +81-3-3273-0554
E-mail: ir@chugai-pharm.co.jp

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